阅读说明：本技术 热气焊塑料焊接设备及焊接方法 (Hot gas welding plastic welding equipment and welding method ) 是由 张春生 张爱淇 于 2020-07-31 设计创作，主要内容包括：本发明提供一种热气焊塑料焊接设备及焊接方法,包括底座,底座上设置有第一架体、第二架体、第三架体、第四架体,第一架体和第二架体上设置有下滑台和上滑台,下滑台上端设置有上模夹具,上滑台下端设置有下模夹具,第三架体和第四架上设置有用来占据或避让下滑台和上滑台和下滑台之间空间位置的中滑台,中滑台上设置有氮气加热中模。利用热气焊塑料焊接设备进行焊接时不存在热板焊中热板被塑料件污染后焊接质量不佳的问题,不存在震动摩擦焊接过程中存在摩擦碎屑的问题,利用加热的氮气对上塑料件和下塑料件的焊接面进行加热到焊接温度后焊接,较激光焊接的成本低,并且只要是塑料件均可以通过本设备进行焊接,扩大了设备的使用范围。(The invention provides hot gas welding plastic welding equipment and a welding method, wherein the hot gas welding plastic welding equipment comprises a base, a first frame body, a second frame body, a third frame body and a fourth frame body are arranged on the base, a lower sliding table and an upper sliding table are arranged on the first frame body and the second frame body, an upper die fixture is arranged at the upper end of the lower sliding table, a lower die fixture is arranged at the lower end of the upper sliding table, a middle sliding table used for occupying or avoiding the space positions between the lower sliding table and the upper sliding table and between the lower sliding table and the lower sliding table is arranged on the third frame body and the fourth frame, and a nitrogen heating. When utilizing hot gas welding plastics welding equipment to weld, do not have the hot plate and weld the not good problem of welding quality after being polluted by the working of plastics in the hot plate welding, there is the clastic problem of friction among the no vibrations friction weld process, utilize the nitrogen gas of heating to weld after heating to welding temperature to the face of weld of last working of plastics and lower working of plastics, than laser welding with low costs to as long as the working of plastics all can weld through this equipment, enlarged the application range of equipment.)

1. The utility model provides a hot gas welding plastics welding equipment which characterized in that: the plastic part fixing device comprises a base, wherein a first frame body and a second frame body which are identical in structure and symmetrically arranged are fixedly installed on two sides of the front end of the base, a lower sliding table and an upper sliding table which can move up and down are sequentially arranged between the first frame body and the second frame body from bottom to top, a lower die clamp for fixing a lower plastic part is installed at the upper end of the lower sliding table, and an upper die clamp for fixing an upper plastic part is installed at the lower end of the upper sliding table; the nitrogen heating middle die is characterized in that a third frame body and a fourth frame body which have the same structure and are symmetrically arranged are fixedly arranged on two sides of the rear end of the base, middle sliding tables used for occupying or avoiding space positions between the lower sliding table and the upper sliding table are arranged on the third frame body and the fourth frame body, the middle sliding tables can move back and forth along the base, a nitrogen heating middle die used for heating the welding surface of the upper plastic piece and the welding surface of the lower plastic piece is arranged on the middle sliding tables, and the nitrogen heating middle die is used for conveying nitrogen through a nitrogen control device;

the lower sliding table comprises a lower frame body, two ends of the lower frame body are slidably mounted on sliding rails through sliding blocks, the sliding rails are fixedly mounted on a first frame body and a second frame body respectively, the sliding rails are perpendicular to the base, a lower mounting plate is fixedly mounted at the upper end of the lower frame body, a positioning hole and a bolt hole are formed in the lower mounting plate, and the lower frame body is driven to slide through a lower driving device; the upper sliding table comprises an upper frame body, two ends of the upper frame body are slidably mounted on the sliding rails through sliding blocks, an upper mounting plate is fixedly mounted at the lower end of the upper frame body, and the upper sliding table is driven to slide through an upper driving device;

the middle sliding table comprises a left mounting plate and a right mounting plate, the bottom end of the left mounting plate is slidably mounted on a left sliding rail through a sliding block, the left sliding rail is fixedly mounted on an upper end beam of the third frame body, and the left mounting plate is driven to slide through a left driving device; the bottom of right side mounting panel passes through slider slidable mounting on right slide rail, right slide rail fixed mounting is on the upper end crossbeam of fourth support body, the right side mounting panel slides through the drive of right drive arrangement.

2. The hot gas welding plastic welding apparatus of claim 1, wherein: the lower die clamp comprises a lower die base plate, a positioning pin matched with a positioning hole in the lower mounting plate is installed at the front end of the lower die base plate, a locking hand button matched with a bolt hole in the lower mounting plate is installed at the corner of the lower die base plate, a fixing column is fixedly installed on the lower die base plate, a lower die plate is fixedly installed on the fixing column, at least three guide sleeves are fixedly installed on the lower die plate, a lower die positioning piece is fixedly installed on the lower die plate, two lower die clamping cylinders are fixedly installed on two sides of the bottom end of the lower die plate, the telescopic ends of the two lower die clamping cylinders are fixedly connected with the two lower die clamping blocks through connecting pieces respectively, and a lower plastic piece is clamped and fixed through the combined action of the;

the upper die clamp comprises an upper die plate, guide pillars with the same number and positions as those of the guide sleeves are fixedly mounted at the lower end of the upper die plate, the upper die plate is fixedly mounted on an upper mounting plate through at least four upper die fixing pieces which are bilaterally symmetrical, an upper die positioning piece is fixedly mounted at the lower end of the upper die plate, two upper die clamping cylinders are arranged on two sides of the upper die positioning piece, the two upper die clamping cylinders are arranged on the upper die plate, and an upper plastic piece is clamped and fixed through the combined action of the movement of the two upper die clamping cylinders and the upper die;

the middle mould heating device comprises a sealing box, a heating pipe is arranged in the sealing box, a gas needle is arranged on the sealing box, the gas needle penetrates through the sealing box, middle mould mounting plates are fixedly mounted on two sides of the sealing box, two sides of the middle mould mounting plates are respectively fixedly mounted on a left side mounting plate and a right side mounting plate through middle mould fixing parts, at least two nitrogen conveying pipes are mounted on the middle mould mounting plate on one side, the output end of each nitrogen conveying pipe is connected with the gas needle after passing through the sealing box, the input end of each nitrogen conveying pipe is connected with a nitrogen control device, the nitrogen control device comprises a pressure reducing valve connected with the output end of a nitrogen making machine, the output end of each pressure reducing valve is connected with a gas distributing block, the gas distributing block is provided with output pipelines with the same number as the nitrogen conveying pipes, the nitrogen after passing through the flowmeter flows into a nitrogen conveying pipe.

3. The hot gas welding plastic welding apparatus of claim 1, wherein: the upper driving device comprises an upper servo motor fixedly mounted on a servo motor mounting plate, the servo motor mounting plate is arranged above the upper sliding table, and two ends of the servo motor mounting plate are fixedly mounted on the first frame body and the second frame body;

the lower driving device comprises a lower servo motor fixedly arranged on the base, an output shaft of the lower servo motor is connected with an input shaft of a lower T-shaped speed reducing motor, output shafts at two ends of the lower T-shaped speed reducing motor are respectively connected with input shafts of two lower right-angle speed reducing motors through a coupler and a connecting shaft, the two lower right-angle speed reducing motors are fixedly arranged on the base, output shafts of the two lower right-angle speed reducing motors are respectively and fixedly connected with two lower ball screws, nuts of the two lower ball screws are fixedly arranged on the lower frame body, the other ends of the two lower ball screws are rotatably arranged in lower screw mounting seats, and the lower screw mounting seats are fixedly arranged on the first frame body and the second frame body;

the left driving device comprises a left ball screw, one end of the left ball screw is fixedly provided with a synchronous belt pulley, one end of the left ball screw with the synchronous belt pulley is rotatably arranged in the mounting seat, the mounting seat of the left ball screw is fixedly arranged on an upper end beam of the third frame body and is arranged at the rear end of the third frame body, and a nut of the left ball screw is fixedly connected onto the left mounting plate through a left connecting strip;

the right driving device comprises a right ball screw, one end of the right ball screw is fixedly provided with a synchronous pulley, one end of the right ball screw with the synchronous pulley is rotatably arranged in the mounting seat, the mounting seat of the right ball screw is fixedly arranged on the upper end beam of the fourth frame body and is arranged at the rear end of the fourth frame body, and the nut of the right ball screw is fixedly connected to the right mounting plate through a right connecting strip;

the synchronous belt pulley of left side ball one end meshes on a synchronous belt with the synchronous belt pulley of right ball one end jointly, still mesh on the synchronous belt and install synchronous belt's servo motor, servo motor fixed mounting is on the third support body.

4. The hot gas welding plastic welding apparatus of claim 1, wherein: the lower sliding table further comprises a lower anti-falling device and a lower displacement detection device, the lower anti-falling device comprises a lower stop air cylinder, the lower stop air cylinder is fixedly mounted on a lower frame body between the second frame body and the lower mounting plate, a telescopic end of the lower stop air cylinder is fixedly provided with a lower stop clamping plate, the lower stop clamping plate is slidably mounted on a lower stop sliding rail through a sliding block, the lower stop sliding rail is fixedly mounted on the lower frame body, when the telescopic end of the lower stop air cylinder extends out, the lower stop clamping plate is driven to move from the lower frame body to the second frame body until the lower stop clamping plate is clamped on a stop shaft with a plurality of clamping steps, and the stop shaft is fixedly mounted on the second frame body and perpendicular to the base; the lower displacement detection device comprises a lower displacement sensor, the lower displacement sensor is fixedly arranged on the first frame body and is perpendicular to the base, a lower displacement sensor sliding block is slidably arranged on the lower displacement sensor, and the lower displacement sensor sliding block is fixedly connected to the lower frame body through a lower sensor connecting plate;

the upper sliding table further comprises an upper anti-falling device and an upper displacement detection device, the upper anti-falling device comprises an upper stop cylinder, the upper stop cylinder is fixedly mounted on the upper frame body between the second frame body and the upper mounting plate, an upper stop clamping plate is fixedly mounted on the telescopic end of the upper stop cylinder, the upper stop clamping plate is slidably mounted on an upper stop sliding rail through a sliding block, the upper stop sliding rail is fixedly mounted on the upper frame body, and when the telescopic end of the upper stop cylinder extends out, the upper stop clamping plate is driven to move from the upper frame body to the second frame body until the upper stop clamping plate is clamped on the stop shaft; the upper displacement detection device comprises an upper displacement sensor, the upper displacement sensor is fixedly installed on the first frame body and perpendicular to the base, an upper displacement sensor sliding block is installed on the upper displacement sensor in a sliding mode, and the upper displacement sensor sliding block is fixedly connected to the upper frame body through an upper sensor connecting plate.

5. The hot gas welding plastic welding apparatus of claim 2, wherein: lower mould mobile device is all installed at both ends about the lower mould bottom plate, lower mould mobile device includes two fixing bases of fixed mounting on the lower mould bottom plate, two all be provided with the cam in the mounting hole of fixing base, two fixing base and two the equal fixed mounting of cam is in a pivot, the one end fixed mounting of pivot has the pivot handle, slidable mounting has the pivot slider in the fixing base of cam below, the gyro wheel is installed to the below of pivot slider.

6. The hot gas welding plastic welding apparatus of claim 1, wherein: the base rear end intermediate position has been seted up and has been dodged the district, dodge the district setting between third support body and fourth support body, dodge and be used for depositing hydraulic lift truck in the district, be provided with the retooling frock that is used for changing mould in the nitrogen gas heating on the hydraulic lift truck, the retooling frock includes the frock bottom plate with the contact of hydraulic lift truck, the frock stand is installed perpendicularly to the corner of frock bottom plate, frock stand upper end fixed mounting has the frock roof, the intermediate position of frock roof has been seted up and has been dodged the through-hole, be provided with a plurality of spacing archs on the frock roof.

7. The hot gas welding plastic welding apparatus of claim 1, wherein: the hydraulic lifting trolley is characterized in that an outer frame body is arranged on the base, the outer frame body covers the first frame body, the second frame body, the third frame body and the fourth frame body, an electric rolling door convenient for pushing a hydraulic lifting trolley is installed at the rear of the outer frame body, an electric cabinet is installed on the side face of the outer frame body, a tower lamp used for an exhaust fan and a display device running state is installed at the upper end of the outer frame body, the exhaust fan is connected with a ventilation pipeline of a factory, a pneumatic safety door is installed at the front end of the outer frame body, safety correlation gratings are installed on the outer frame body around the safety door, and an operation touch screen is further installed at the front end of the outer frame body.

8. The hot gas welding plastic welding apparatus of claim 1, wherein: the guide pillar of the upper die clamp is a conical guide pillar, the guide sleeve of the lower die clamp is a conical guide sleeve, the conical guide pillar is fixedly arranged at the lower end of the upper die plate through a guide pillar support, and the free end of the conical guide pillar is provided with a conical head which is in contact with the lower die clamp when the die is closed; the taper guide sleeve comprises a guide sleeve positioning seat fixedly mounted on the lower die plate, a cushion block with a screw hole is fixedly mounted at the bottom end inside the guide sleeve positioning seat, a sliding guide sleeve is matched in the taper guide sleeve, a taper mounting hole matched with a taper head of the taper guide pillar is formed in the upper end of the sliding guide sleeve, a screw mounting hole is formed in the sliding guide sleeve below the taper mounting hole, a screw is mounted in the screw mounting hole, a spring is sleeved on the screw and is arranged in the sliding guide sleeve, and when the spring is in a relaxation state, the lower end of the sliding guide sleeve is in a suspension state.

9. The hot gas welding plastic welding apparatus of claim 1, wherein: the lower die bottom plate is also fixedly provided with two handles, and the two handles are arranged at the front end of the lower die bottom plate.

10. Welding method of a hot gas welding plastic welding apparatus according to any of the claims 1-9, characterized in that it comprises the following steps:

step S1: upper piece

Respectively clamping and fixing the upper plastic piece and the lower plastic piece by using an upper die clamp and a lower die clamp;

step S11: clamping and fixing of upper plastic part

An operator takes the upper plastic part, the welding surface of the upper plastic part faces downwards, the non-welding surface faces upwards, the non-welding end of the upper plastic part is placed in the upper die positioning piece, and the upper plastic part is clamped and fixed under the combined action of the upper die clamping cylinders and the upper die clamping jaws on the two sides;

step S12: clamping and fixing of lower plastic part

An operator takes down the plastic part, the welding surface of the lower plastic part is upward, the non-welding surface is downward, the non-welding end of the lower plastic part is placed in the lower die positioning piece, the lower die clamping cylinders on the two sides move to drive the lower die clamping blocks on the two sides, and the lower plastic part is clamped and fixed under the combined action of the lower die positioning piece and the lower die clamping blocks;

step S2: heating of

Heating the welding surfaces of the upper plastic part and the lower plastic part by using a nitrogen heating middle die;

step S21: upper position of middle mold in nitrogen heating

The left driving device and the right driving device are used for driving the middle sliding table to carry nitrogen to heat the middle die to move to a preset position between the upper die clamp and the lower die clamp;

step S22: upper position of upper die clamp

Driving the upper sliding table to carry the upper die clamp to move downwards to a preset position above the middle die adjacent to the nitrogen heating die by using an upper driving device;

step S23: upper position of lower die clamp

A lower driving device is used for driving the lower sliding table to carry the lower die fixture to move upwards to a preset position below the middle heating die adjacent to the nitrogen gas;

step S23: supply and heating of nitrogen

The nitrogen gas is transmitted into a nitrogen gas control device by a nitrogen making machine, the nitrogen gas control device can control the pressure reduction, gas distribution and flow rate of the nitrogen gas, the nitrogen gas flowing out of the nitrogen gas control device is supplied into a gas needle of a nitrogen gas heating middle die, a heating pipe is used for heating the nitrogen gas, when the temperature of the nitrogen gas reaches the welding temperature, the gas needle penetrating through a sealing box is used for discharging hot nitrogen gas, and the hot nitrogen gas is used for heating the heating surface of an upper plastic part above the gas needle and the heating surface of a lower plastic part below the gas needle;

step S3: welding of

Step S31: resetting of middle mould in nitrogen heating

The left driving device and the right driving device are used for driving the middle sliding table to carry nitrogen to heat the middle die to move out of a preset position between the upper die clamp and the lower die clamp and return to the original position, namely, the middle die is positioned above the rear end of the base;

step S32: matched die welding of upper plastic part welding surface and lower plastic part welding surface

The upper driving device and the lower driving device are used for respectively driving the upper die clamp and the lower die clamp to move relatively to a preset position, the welding surface of the upper plastic piece is completely contacted with the welding surface of the lower plastic piece, and the guide pillar on the upper die plate is butted with the guide sleeve on the lower die bottom plate;

step S4: get one

Step S41: loosening of upper plastic part

The upper plastic part clamped and fixed is loosened by the movement of the upper die clamping cylinders on the two sides;

step S42: returning of upper die clamp

An upper driving device is used for driving the upper sliding table to carry the upper die clamp to move upwards to a preset position;

step S43: loosening of lower plastic part

The lower die clamping cylinders on the two sides move to drive the lower die clamping blocks on the two sides to move outwards, the lower plastic piece clamped and fixed is loosened, and an operator takes down the welded plastic piece;

step S44: lower die clamp homing

A lower driving device is used for driving the lower sliding table to carry the lower die fixture to move downwards to a preset position;

step S5: die change

When welding parts of different types need to be welded, the upper die clamp, the lower die clamp and the nitrogen heating middle die are replaced;

step S51: die change of middle die in nitrogen heating

Step S511: mould taking out

An operator raises the electric roller shutter door, pushes the hydraulic lifting vehicle to carry the die changing tool to a position below the nitrogen heating middle die, raises the hydraulic lifting vehicle until the die changing tool and the nitrogen heating middle die are in mutual contact, loosens the middle die fixing part, removes the nitrogen heating middle die and an electric aerial plug and an air aerial plug which are electrically connected with equipment, continues to raise the hydraulic lifting vehicle, enables the nitrogen heating middle die to be separated from the middle sliding table, moves the middle sliding table forwards, lowers the hydraulic lifting vehicle while the nitrogen heating middle die also descends, pushes out the hydraulic lifting vehicle, and removes the original nitrogen heating middle die;

step S512: replacement of new mould

The method comprises the following steps of taking down an original nitrogen heating middle die, simultaneously placing a new nitrogen heating middle die, pushing a hydraulic lift truck to the middle position of a third frame body and a fourth frame body along a rolling door, lifting the hydraulic lift truck, moving a middle sliding table backwards to two sides of the new nitrogen heating middle die, fixing the new nitrogen heating middle die by using a middle die fixing piece, installing an electric aerial plug and an air aerial plug which are electrically connected with equipment in the new nitrogen heating middle die, lowering the hydraulic lift truck, and closing the electric rolling door;

step S52: mould changing of upper mould clamp and lower mould clamp

Step S521: mould taking out

Carrying out die assembly operation on the upper die clamp and the lower die clamp, and butting a guide pillar of the upper die clamp with a guide sleeve of the lower die clamp at the moment;

an operator detaches the electric aerial plug and the air aerial plug which are electrically connected with the equipment on the upper die fixture, loosens the upper die fixing piece, and moves the upper sliding table upwards to separate the upper die fixture from the upper sliding table;

an operator loosens a locking hand button on the lower die clamp, lifts up the positioning pin, detaches the electric aerial plug and the air aerial plug which are electrically connected with the equipment on the lower die clamp, slides out the roller by using the lower die moving device, pulls the handle to move the lower die clamp outwards, enables the lower die clamp and the upper die clamp to roll out from the lower sliding table, and takes the lower die clamp and the upper die clamp;

step S522: replacement of new mould

An operator moves a new upper die fixture and a new lower die fixture onto the lower sliding table, fixes the new lower die fixture onto the lower sliding table by using a locking hand button and a positioning pin on the lower die fixture, and installs an electric aerial plug and an air aerial plug which electrically connect the new lower die fixture with equipment;

and moving the upper sliding table downwards until the new upper die fixture is contacted with the upper sliding table, fixing the new upper die fixture to the lower end of the upper sliding table by using the upper die fixing piece, and installing the electric aerial plug and the air aerial plug which are electrically connected with the new upper die fixture and the equipment.

Technical Field

The invention belongs to the technical field of welding equipment, and particularly relates to hot gas welding plastic welding equipment and a welding method.

Background

The existing plastic welding method mainly comprises hot plate welding, vibration friction welding, laser welding and the like, wherein the hot plate welding is to melt a plastic piece by contacting a heating plate with the plastic piece; the vibration friction welding is to load certain axial pressure on the welding surfaces of two plastic parts, the welding surfaces of the two plastic parts are welded together through friction heat generated by violent friction movement, and because the friction is violent, a lot of plastic scraps are usually found to fall off due to the friction of the welding surfaces of the two plastic parts after the welding is finished, and the scraps can scatter on a tool or are bonded on the welding surfaces of the plastic parts and are difficult to be completely removed, so that the vibration friction welding has great influence on products, and great noise can be generated in the welding process, so that certain damage is caused to the health of operators; laser welding adopts lower pressure crimping together with the face of weld of two kinds of working of plastics earlier, then through the strong radiation wave of the boundling that laser produced, melt the working of plastics face of weld, thereby be in the same place two working of plastics welding, laser welding has certain requirement to the material of working of plastics, two kinds of working of plastics that weld together, the material of a working of plastics must be transparent to laser, the material of another kind of working of plastics is opaque to laser, just so can realize laser welding, and laser welding's cost is higher.

Disclosure of Invention

In order to solve the problems in the background technology, the invention provides hot gas welding plastic welding equipment and a welding method.

The technical scheme of the invention is as follows:

a hot gas welding plastic welding device comprises a base, wherein a first frame body and a second frame body which are identical in structure and symmetrically arranged are fixedly installed on two sides of the front end of the base, a lower sliding table and an upper sliding table which can move up and down are sequentially arranged between the first frame body and the second frame body from bottom to top, a lower die clamp for fixing a lower plastic piece is installed at the upper end of the lower sliding table, and an upper die clamp for fixing an upper plastic piece is installed at the lower end of the upper sliding table; the nitrogen heating middle die is characterized in that a third frame body and a fourth frame body which have the same structure and are symmetrically arranged are fixedly arranged on two sides of the rear end of the base, middle sliding tables used for occupying or avoiding space positions between the lower sliding table and the upper sliding table are arranged on the third frame body and the fourth frame body, the middle sliding tables can move back and forth along the base, a nitrogen heating middle die used for heating the welding surface of the upper plastic piece and the welding surface of the lower plastic piece is arranged on the middle sliding tables, and the nitrogen heating middle die is used for conveying nitrogen through a nitrogen control device;

the lower sliding table comprises a lower frame body, two ends of the lower frame body are slidably mounted on sliding rails through sliding blocks, the sliding rails are fixedly mounted on a first frame body and a second frame body respectively, the sliding rails are perpendicular to the base, a lower mounting plate is fixedly mounted at the upper end of the lower frame body, a positioning hole and a bolt hole are formed in the lower mounting plate, and the lower frame body is driven to slide through a lower driving device; the upper sliding table comprises an upper frame body, two ends of the upper frame body are slidably mounted on the sliding rails through sliding blocks, an upper mounting plate is fixedly mounted at the lower end of the upper frame body, and the upper sliding table is driven to slide through an upper driving device;

the middle sliding table comprises a left mounting plate and a right mounting plate, the bottom end of the left mounting plate is slidably mounted on a left sliding rail through a sliding block, the left sliding rail is fixedly mounted on an upper end beam of the third frame body, and the left mounting plate is driven to slide through a left driving device; the bottom of right side mounting panel passes through slider slidable mounting on right slide rail, right slide rail fixed mounting is on the upper end crossbeam of fourth support body, the right side mounting panel slides through the drive of right drive arrangement.

Preferably, the lower die clamp comprises a lower die base plate, a positioning pin matched with a positioning hole in the lower mounting plate is installed at the front end of the lower die base plate, a locking hand button matched with a bolt hole in the lower mounting plate is installed at the corner of the lower die base plate, a fixing column is fixedly installed on the lower die base plate, a lower die plate is fixedly installed on the fixing column, at least three guide sleeves are fixedly installed on the lower die plate, a lower die positioning piece is fixedly installed on the lower die plate, two lower die clamping cylinders are fixedly installed on two sides of the bottom end of the lower die plate, telescopic ends of the two lower die clamping cylinders are respectively fixedly connected with the two lower die clamping blocks through connecting pieces, and a lower plastic piece is clamped and fixed through the relative movement of the two lower;

the upper die clamp comprises an upper die plate, guide pillars with the same number and positions as those of the guide sleeves are fixedly mounted at the lower end of the upper die plate, the upper die plate is fixedly mounted on an upper mounting plate through at least four upper die fixing pieces which are bilaterally symmetrical, an upper die positioning piece is fixedly mounted at the lower end of the upper die plate, two upper die clamping cylinders are arranged on two sides of the upper die positioning piece, the two upper die clamping cylinders are arranged on the upper die plate, and an upper plastic piece is clamped and fixed through the combined action of the movement of the two upper die clamping cylinders and the upper die;

the middle mould heating device comprises a sealing box, a heating pipe is arranged in the sealing box, a gas needle is arranged on the sealing box, the gas needle penetrates through the sealing box, middle mould mounting plates are fixedly mounted on two sides of the sealing box, two sides of the middle mould mounting plates are respectively fixedly mounted on a left side mounting plate and a right side mounting plate through middle mould fixing parts, at least two nitrogen conveying pipes are mounted on the middle mould mounting plate on one side, the output end of each nitrogen conveying pipe is connected with the gas needle after passing through the sealing box, the input end of each nitrogen conveying pipe is connected with a nitrogen control device, the nitrogen control device comprises a pressure reducing valve connected with the output end of a nitrogen making machine, the output end of each pressure reducing valve is connected with a gas distributing block, the gas distributing block is provided with output pipelines with the same number as the nitrogen conveying pipes, the nitrogen after passing through the flowmeter flows into a nitrogen conveying pipe.

Preferably, the upper driving device comprises an upper servo motor fixedly mounted on a servo motor mounting plate, the servo motor mounting plate is arranged above the upper sliding table, and two ends of the servo motor mounting plate are fixedly mounted on the first frame body and the second frame body;

the lower driving device comprises a lower servo motor fixedly arranged on the base, an output shaft of the lower servo motor is connected with an input shaft of a lower T-shaped speed reducing motor, output shafts at two ends of the lower T-shaped speed reducing motor are respectively connected with input shafts of two lower right-angle speed reducing motors through a coupler and a connecting shaft, the two lower right-angle speed reducing motors are fixedly arranged on the base, output shafts of the two lower right-angle speed reducing motors are respectively and fixedly connected with two lower ball screws, nuts of the two lower ball screws are fixedly arranged on the lower frame body, the other ends of the two lower ball screws are rotatably arranged in lower screw mounting seats, and the lower screw mounting seats are fixedly arranged on the first frame body and the second frame body;

the left driving device comprises a left ball screw, one end of the left ball screw is fixedly provided with a synchronous belt pulley, one end of the left ball screw with the synchronous belt pulley is rotatably arranged in the mounting seat, the mounting seat of the left ball screw is fixedly arranged on an upper end beam of the third frame body and is arranged at the rear end of the third frame body, and a nut of the left ball screw is fixedly connected onto the left mounting plate through a left connecting strip;

the right driving device comprises a right ball screw, one end of the right ball screw is fixedly provided with a synchronous pulley, one end of the right ball screw with the synchronous pulley is rotatably arranged in the mounting seat, the mounting seat of the right ball screw is fixedly arranged on the upper end beam of the fourth frame body and is arranged at the rear end of the fourth frame body, and the nut of the right ball screw is fixedly connected to the right mounting plate through a right connecting strip;

the synchronous belt pulley of left side ball one end meshes on a synchronous belt with the synchronous belt pulley of right ball one end jointly, still mesh on the synchronous belt and install synchronous belt's servo motor, servo motor fixed mounting is on the third support body.

Preferably, the lower sliding table further comprises a lower anti-drop device and a lower displacement detection device, the lower anti-drop device comprises a lower stop cylinder, the lower stop cylinder is fixedly mounted on the lower frame body between the second frame body and the lower mounting plate, a telescopic end of the lower stop cylinder is fixedly provided with a lower stop clamping plate, the lower stop clamping plate is slidably mounted on a lower stop sliding rail through a sliding block, the lower stop sliding rail is fixedly mounted on the lower frame body, when the telescopic end of the lower stop cylinder extends out, the lower stop clamping plate is driven to move from the lower frame body to the second frame body until the lower stop clamping plate is clamped on a stop shaft with a plurality of clamping steps, and the stop shaft is fixedly mounted on the second frame body and perpendicular to the base; the lower displacement detection device comprises a lower displacement sensor, the lower displacement sensor is fixedly arranged on the first frame body and is perpendicular to the base, a lower displacement sensor sliding block is slidably arranged on the lower displacement sensor, and the lower displacement sensor sliding block is fixedly connected to the lower frame body through a lower sensor connecting plate;

the upper sliding table further comprises an upper anti-falling device and an upper displacement detection device, the upper anti-falling device comprises an upper stop cylinder, the upper stop cylinder is fixedly mounted on the upper frame body between the second frame body and the upper mounting plate, an upper stop clamping plate is fixedly mounted on the telescopic end of the upper stop cylinder, the upper stop clamping plate is slidably mounted on an upper stop sliding rail through a sliding block, the upper stop sliding rail is fixedly mounted on the upper frame body, and when the telescopic end of the upper stop cylinder extends out, the upper stop clamping plate is driven to move from the upper frame body to the second frame body until the upper stop clamping plate is clamped on the stop shaft; the upper displacement detection device comprises an upper displacement sensor, the upper displacement sensor is fixedly installed on the first frame body and perpendicular to the base, an upper displacement sensor sliding block is installed on the upper displacement sensor in a sliding mode, and the upper displacement sensor sliding block is fixedly connected to the upper frame body through an upper sensor connecting plate.

As preferred, lower mould mobile device is all installed at both ends about the lower mould bottom plate, lower mould mobile device includes two fixing bases of fixed mounting on the lower mould bottom plate, two all be provided with the cam in the mounting hole of fixing base, two fixing base and two the equal fixed mounting of cam is in a pivot, the one end fixed mounting of pivot has the pivot handle, slidable mounting has the pivot slider in the fixing base of cam below, the gyro wheel is installed to the below of pivot slider.

As preferred, the base rear end intermediate position has been seted up and has been dodged the district, dodge the district and set up between third support body and fourth support body, dodge and be used for depositing hydraulic lift truck in the district, be provided with the retooling frock that is used for changing mould in the nitrogen gas heating on the hydraulic lift truck, the retooling frock includes the frock bottom plate with the contact of hydraulic lift truck, the frock stand is installed perpendicularly to the corner of frock bottom plate, frock stand upper end fixed mounting has the frock roof, the intermediate position of frock roof has been seted up and has been dodged the through-hole, be provided with a plurality of spacing archs on the frock roof.

As preferred, be provided with the outer frame body on the base, the outer frame body covers first support body, second support body, third support body, fourth support body, the electric rolling shutter door of being convenient for to push hydraulic lift car is installed at the rear of outer frame body, the electric cabinet is installed to the side of outer frame body, the tower lamp that is used for air discharge fan and display device running state is installed to the upper end of outer frame body, the air discharge fan is connected with the air pipe of factory, pneumatic emergency exit is installed to the front end of outer frame body, install safe correlation grating on the emergency exit outer frame body all around, the operation touch screen is still installed to the front end of outer frame body.

Preferably, the guide pillar of the upper die clamp is a conical guide pillar, the guide sleeve of the lower die clamp is a conical guide sleeve, the conical guide pillar is fixedly mounted at the lower end of the upper die plate through a guide pillar support, and the free end of the conical guide pillar is provided with a conical head which is in mutual contact with the lower die clamp during die assembly; the taper guide sleeve comprises a guide sleeve positioning seat fixedly mounted on the lower die plate, a cushion block with a screw hole is fixedly mounted at the bottom end inside the guide sleeve positioning seat, a sliding guide sleeve is matched in the taper guide sleeve, a taper mounting hole matched with a taper head of the taper guide pillar is formed in the upper end of the sliding guide sleeve, a screw mounting hole is formed in the sliding guide sleeve below the taper mounting hole, a screw is mounted in the screw mounting hole, a spring is sleeved on the screw and is arranged in the sliding guide sleeve, and when the spring is in a relaxation state, the lower end of the sliding guide sleeve is in a suspension state.

Preferably, the lower die base plate is further fixedly provided with two handles, and the two handles are arranged at the front end of the lower die base plate.

The invention also provides a welding method of the hot gas welding plastic welding equipment, which comprises the following steps:

step S1: upper piece

Respectively clamping and fixing the upper plastic piece and the lower plastic piece by using an upper die clamp and a lower die clamp;

step S11: clamping and fixing of upper plastic part

An operator takes the upper plastic part, the welding surface of the upper plastic part faces downwards, the non-welding surface faces upwards, the non-welding end of the upper plastic part is placed in the upper die positioning piece, and the upper plastic part is clamped and fixed under the combined action of the upper die clamping cylinders and the upper die clamping jaws on the two sides;

step S12: clamping and fixing of lower plastic part

An operator takes down the plastic part, the welding surface of the lower plastic part is upward, the non-welding surface is downward, the non-welding end of the lower plastic part is placed in the lower die positioning piece, the lower die clamping cylinders on the two sides move to drive the lower die clamping blocks on the two sides, and the lower plastic part is clamped and fixed under the combined action of the lower die positioning piece and the lower die clamping blocks;

step S2: heating of

Heating the welding surfaces of the upper plastic part and the lower plastic part by using a nitrogen heating middle die;

step S21: upper position of middle mold in nitrogen heating

The left driving device and the right driving device are used for driving the middle sliding table to carry nitrogen to heat the middle die to move to a preset position between the upper die clamp and the lower die clamp;

step S22: upper position of upper die clamp

Driving the upper sliding table to carry the upper die clamp to move downwards to a preset position above the middle die adjacent to the nitrogen heating die by using an upper driving device;

step S23: upper position of lower die clamp

A lower driving device is used for driving the lower sliding table to carry the lower die fixture to move upwards to a preset position below the middle heating die adjacent to the nitrogen gas;

step S23: supply and heating of nitrogen

The nitrogen gas is transmitted into a nitrogen gas control device by a nitrogen making machine, the nitrogen gas control device can control the pressure reduction, gas distribution and flow rate of the nitrogen gas, the nitrogen gas flowing out of the nitrogen gas control device is supplied into a gas needle of a nitrogen gas heating middle die, a heating pipe is used for heating the nitrogen gas, when the temperature of the nitrogen gas reaches the welding temperature, the gas needle penetrating through a sealing box is used for discharging hot nitrogen gas, and the hot nitrogen gas is used for heating the heating surface of an upper plastic part above the gas needle and the heating surface of a lower plastic part below the gas needle;

step S3: welding of

Step S31: resetting of middle mould in nitrogen heating

The left driving device and the right driving device are used for driving the middle sliding table to carry nitrogen to heat the middle die to move out of a preset position between the upper die clamp and the lower die clamp and return to the original position, namely, the middle die is positioned above the rear end of the base;

step S32: matched die welding of upper plastic part welding surface and lower plastic part welding surface

The upper driving device and the lower driving device are used for respectively driving the upper die clamp and the lower die clamp to move relatively to a preset position, the welding surface of the upper plastic piece is completely contacted with the welding surface of the lower plastic piece, and the guide pillar on the upper die plate is butted with the guide sleeve on the lower die bottom plate;

step S4: get one

Step S41: loosening of upper plastic part

The upper plastic part clamped and fixed is loosened by the movement of the upper die clamping cylinders on the two sides;

step S42: returning of upper die clamp

An upper driving device is used for driving the upper sliding table to carry the upper die clamp to move upwards to a preset position;

step S43: loosening of lower plastic part

The lower die clamping cylinders on the two sides move to drive the lower die clamping blocks on the two sides to move outwards, the lower plastic piece clamped and fixed is loosened, and an operator takes down the welded plastic piece;

step S44: lower die clamp homing

A lower driving device is used for driving the lower sliding table to carry the lower die fixture to move downwards to a preset position;

step S5: die change

When welding parts of different types need to be welded, the upper die clamp, the lower die clamp and the nitrogen heating middle die are replaced;

step S51: die change of middle die in nitrogen heating

Step S511: mould taking out

An operator raises the electric roller shutter door, pushes the hydraulic lifting vehicle to carry the die changing tool to a position below the nitrogen heating middle die, raises the hydraulic lifting vehicle until the die changing tool and the nitrogen heating middle die are in mutual contact, loosens the middle die fixing part, removes the nitrogen heating middle die and an electric aerial plug and an air aerial plug which are electrically connected with equipment, continues to raise the hydraulic lifting vehicle, enables the nitrogen heating middle die to be separated from the middle sliding table, moves the middle sliding table forwards, lowers the hydraulic lifting vehicle while the nitrogen heating middle die also descends, pushes out the hydraulic lifting vehicle, and removes the original nitrogen heating middle die;

step S512: replacement of new mould

Placing a new nitrogen heating middle die simultaneously after taking off an original nitrogen heating middle die, pushing the hydraulic lift truck to the middle position of a third frame body and a fourth frame body along the roller shutter door, lifting the hydraulic lift truck, moving a middle sliding table to the two sides of the new nitrogen heating middle die, fixing the new nitrogen heating middle die by using a middle die fixing piece, installing the new nitrogen heating middle die and electrically connecting an electric aerial plug and an air aerial plug of equipment, lowering the hydraulic lift truck, and closing the electric roller shutter door.

Step S52: mould changing of upper mould clamp and lower mould clamp

Step S521: mould taking out

Carrying out die assembly operation on the upper die clamp and the lower die clamp, and butting a guide pillar of the upper die clamp with a guide sleeve of the lower die clamp at the moment;

an operator detaches the electric aerial plug and the air aerial plug which are electrically connected with the equipment on the upper die fixture, loosens the upper die fixing piece, and moves the upper sliding table upwards to separate the upper die fixture from the upper sliding table;

an operator loosens a locking hand button on the lower die clamp, lifts up the positioning pin, detaches the electric aerial plug and the air aerial plug which are electrically connected with the equipment on the lower die clamp, slides out the roller by using the lower die moving device, pulls the handle to move the lower die clamp outwards, enables the lower die clamp and the upper die clamp to roll out from the lower sliding table, and takes the lower die clamp and the upper die clamp;

step S522: replacement of new mould

An operator moves a new upper die fixture and a new lower die fixture onto the lower sliding table, fixes the new lower die fixture onto the lower sliding table by using a locking hand button and a positioning pin on the lower die fixture, and installs an electric aerial plug and an air aerial plug which electrically connect the new lower die fixture with equipment;

and moving the upper sliding table downwards until the new upper die fixture is contacted with the upper sliding table, fixing the new upper die fixture to the lower end of the upper sliding table by using the upper die fixing piece, and installing the electric aerial plug and the air aerial plug which are electrically connected with the new upper die fixture and the equipment.

The invention has the following beneficial effects:

(1) the hot gas welding plastic welding equipment provided by the invention does not need a plastic part to be contacted with the hot plate, does not have the problem of poor welding quality after the hot plate is polluted by the plastic part in hot plate welding, does not need to carry out violent friction between the plastic parts, does not have the problem of friction debris in the vibration friction welding process, utilizes the heated nitrogen to heat the welding surfaces of the upper plastic part and the lower plastic part to the welding temperature and then welds the welding surfaces, has lower cost compared with laser welding, can weld the plastic parts through the equipment, and expands the application range of the equipment as long as the plastic parts can be welded.

(2) According to the hot gas welding plastic welding equipment provided by the invention, the upper driving device and the lower driving device are arranged on the periphery, the welding space is not occupied, meanwhile, the upper sliding table is connected with the upper mold fixture through the upper mold fixing part, the upper mold fixture is convenient to disassemble and replace, the upper sliding table and the lower sliding table can be stably lifted or lowered by adopting a mode that the servo motor drives the ball screw to rotate through the speed reducing motor, the upper sliding table is driven to move by utilizing one upper servo motor, the consistency of the movement processes of the left side and the right side of the upper sliding table is ensured, and the lower sliding table is driven to move by utilizing one lower servo motor, so that the consistency of the movement processes of the left side and.

(3) The hot gas welding plastic welding equipment provided by the invention adopts a mechanical clamping plate form, has large locking force, and can prevent the plastic welding equipment from falling off accidentally in the static or moving process of the upper sliding table and the lower sliding table. In addition, an upper displacement detection device for detecting displacement of the upper sliding table and a lower displacement detection device for detecting displacement of the lower sliding table are further arranged, whether the displacement conditions of the upper sliding table and the lower sliding table are the same as preset displacement or not is monitored in real time, operation of the welding equipment can be immediately stopped if deviation exists, and safety of the welding equipment is further guaranteed.

(4) According to the hot gas welding plastic welding equipment, the hydraulic lift truck and the die changing tool are placed in the outer frame body, the storage is convenient, meanwhile, the equipment has high flexibility, the die changing tool can be used for changing the nitrogen heating middle die to meet the welding requirements of products in different forms, the lower die clamp can be arranged in a dragging and moving type, the dragging of the lower die clamp is carried out after the upper die clamp and the lower die clamp are assembled through the matching between the handle and the roller, the sliding friction is changed into the rolling friction in the dragging process, the die changing is convenient, and the die changing working hour and the die changing manpower are saved.

(5) According to the hot gas welding plastic welding equipment, the nitrogen making machine is used for enabling the prepared nitrogen to flow into the nitrogen heating middle die after controlling the pressure and the flow of the nitrogen through the nitrogen control device, the sealing box in the nitrogen heating middle die reduces the heat loss of the heating pipe, the heating rate is improved, meanwhile, the gas needle penetrates through the sealing box, the welding surfaces of the plastic parts above and below the plastic part can be conveniently heated, in addition, the nitrogen is used for heating the plastic, the oxidation phenomenon caused by air heating is avoided, and the welding quality is improved.

(6) According to the hot gas welding plastic welding equipment, the electric control box is electrically connected with the upper servo motor, the lower servo motor, the operation touch screen, the tower lamp, the safety door and the safety correlation grating, the operation process of the equipment is controlled by operating the touch screen, and the number of operators is reduced. Show green when the tower lamp, this equipment operation is normal, shows red when the tower lamp, and this equipment trouble shows yellow when the tower lamp, and this equipment gets into the debugging stage, makes things convenient for management and maintenance personal to observe the equipment condition at a distance and in time handles the equipment problem.

(7) The welding method of the hot gas welding plastic welding equipment comprises the steps of feeding, heating, welding, taking and die changing, wherein the heating step is to heat the welding surfaces of the upper plastic part and the lower plastic part by using a nitrogen heating middle die, and the welding surfaces of the upper plastic part and the lower plastic part are filled with hot nitrogen, so that the heating uniformity of the welding surfaces is ensured, the two welding surfaces can be completely fused together in the welding process, and the welding surfaces are attractive.

Drawings

Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:

fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is another angle structure diagram of fig. 1.

FIG. 4 is a schematic view of the present invention with the outer frame hidden.

Fig. 5 is an assembly diagram of the upper sliding table and the lower sliding table with the first frame body and the second frame body according to the present invention.

Fig. 6 is a front view of fig. 5.

Fig. 7 is an enlarged view of a portion a in fig. 5.

Fig. 8 is an enlarged view at B in fig. 5.

Fig. 9 is an enlarged view at C in fig. 5.

Fig. 10 is an enlarged view at D in fig. 5.

Fig. 11 is an assembly view of the third frame, the fourth frame, the middle sliding table and the nitrogen heating middle mold according to the present invention.

Fig. 12 is an exploded view of the third frame, the fourth frame and the middle slide table in the present invention.

Fig. 13 is a schematic structural view of an upper die holder according to the present invention.

FIG. 14 is a schematic view of the structure of the lower mold holder of the present invention.

Fig. 15 is another angular configuration of fig. 14.

FIG. 16 is a schematic view of the structure of a middle mold in the nitrogen heating of the present invention.

Fig. 17 is a front view of fig. 16.

Fig. 18 is a top view of fig. 16.

FIG. 19 is a schematic view showing the structure of a nitrogen gas control apparatus according to the present invention.

Fig. 20 is a schematic structural view of the die change tool of the present invention.

FIG. 21 is a cross-sectional view of the tapered guide sleeve of the present invention.

Wherein the reference numerals are: comprises a base 1, a lower sliding table 2, an upper sliding table 3, a lower die clamp 4, an upper die clamp 5, a nitrogen heating middle die 7, a nitrogen control device 8, an outer frame 9, a first frame 101, a second frame 102, a third frame 103, a fourth frame 104, an avoidance area 105, a hydraulic lift truck 106, a die changing tool 107, a tool bottom plate 108, a tool upright 109, a tool top plate 110, an avoidance through hole 111, a limit bulge 112, a lower frame 201, a slide rail 202, a lower mounting plate 203, a lower servo motor 204, a lower ball screw 205, a lower anti-falling device 206, a lower displacement detection device 207, a lower stop cylinder 208, a lower stop clamping plate 209, a lower stop slide 210, a stop shaft 211, a lower displacement sensor 212, a lower displacement sensor slide block 213, a lower sensor connecting plate 214, an upper frame 301, an upper mounting plate 302, an upper servo motor 303, an upper ball screw 304, an upper anti-falling device 305, an upper displacement detection device, An upper stop cylinder 307, an upper stop clamping plate 308, an upper stop sliding rail 309, an upper displacement sensor 310, an upper displacement sensor sliding block 311, an upper sensor connecting plate 312, a lower die bottom plate 401, a conical guide sleeve 402, a guide sleeve positioning seat 402-1, a cushion block 402-2, a sliding guide sleeve 402-3, a conical mounting hole 402-4, a screw 402-5, a spring 402-6, a positioning pin 403, a locking knob 404, a fixing column 405, a lower die plate 406, a lower die positioning piece 407, a lower die clamping cylinder 408, a lower die clamping block 409, a lower die moving device, a fixing seat 410, a cam 411, a rotating shaft handle, a rotating shaft sliding block 413, a roller 414, a handle 415, an upper die plate 501, a conical guide pillar 502, a conical head 502-1, a guide pillar support 502-2, an upper die fixing piece 503, an upper die positioning piece 504, an upper die clamping cylinder 505, The device comprises a right side mounting plate 602, a left slide rail 603, a left driving device, a right slide rail 604, a left ball screw 605, a left connecting strip 606, a right ball screw 607, a right connecting strip 608, a toothed belt 609, a servo motor 610, a shield 611, a seal box 701, a heating pipe 702, a gas needle 703, a middle mold mounting plate 704, a middle mold fixing part 705, a nitrogen conveying pipe 706, a nitrogen generator 801, a pressure reducing valve 802, a gas distributing block 803, a throttle valve 804, a flow meter 805, an electric rolling door 901, an electric cabinet 902, an exhaust fan 903, a tower lamp 904, a safety door 905, a safety correlation grating 906 and an operation touch screen 907.

Detailed Description

In order to make the technical solutions and advantages thereof better understood by those skilled in the art, the present application is described in detail below with reference to the accompanying drawings, but the present application is not limited to the scope of the present invention.