阅读说明：本技术 一种不锈钢折弯机 (Stainless steel bending machine ) 是由 孔令锋 于 2021-07-21 设计创作，主要内容包括：本发明公开了一种不锈钢折弯机,包括基座,所述基座的上端对称固定有两个竖板,两个所述竖板的上端共同固定连接有横板,所述横板的下端安装有电动液压伸缩杆,所述电动液压伸缩杆的伸缩端固定连接有安装板,所述安装板的下端安装有加工器,所述基座内设有第一安装腔,所述基座的上端设有一个开口和多个通水口,每个所述通水口和一个开口的下端均与第一安装腔相连通,所述基座的下端设有排水口,所述排水口的上端与第一安装腔相连通。该装置能够有效的通过消音机构降低加工时产生的噪音,并且出料机构能够自动进行出料,降低了工作人员的劳动力,固定板和短弹簧的设计,避免繁琐的固定操作,提高了加工效率。(The invention discloses a stainless steel bending machine which comprises a base, wherein two vertical plates are symmetrically fixed at the upper end of the base, a transverse plate is fixedly connected to the upper ends of the two vertical plates together, an electric hydraulic telescopic rod is installed at the lower end of the transverse plate, an installation plate is fixedly connected to the telescopic end of the electric hydraulic telescopic rod, a machining device is installed at the lower end of the installation plate, a first installation cavity is formed in the base, an opening and a plurality of water through openings are formed in the upper end of the base, the lower end of each water through opening and the lower end of one opening are communicated with the first installation cavity, a water outlet is formed in the lower end of the base, and the upper end of the water outlet is communicated with the first installation cavity. The device can effectually reduce the noise that produces man-hour through amortization mechanism to discharge mechanism can carry out the ejection of compact automatically, has reduced staff's labour, and loaded down with trivial details fixed operation is avoided in the design of fixed plate and short spring, has improved machining efficiency.)

1. The stainless steel bending machine comprises a base (1) and is characterized in that two risers (22) are symmetrically fixed at the upper end of the base (1), two risers (22) are fixedly connected with a transverse plate (23) at the upper end of the risers, an electric hydraulic telescopic rod (6) is installed at the lower end of the transverse plate (23), a mounting plate (7) is fixedly connected with the telescopic end of the electric hydraulic telescopic rod (6), a processing device (8) is installed at the lower end of the mounting plate (7), a first mounting cavity (2) is arranged in the base (1), an opening (4) and a plurality of water through openings (5) are arranged at the upper end of the base (1), the lower ends of the water through openings (5) and the opening (4) are communicated with the first mounting cavity (2), a water outlet is arranged at the lower end of the base (1), and the upper end of the water outlet is communicated with the first mounting cavity (2), install sprue (3) on the outlet, be equipped with noise reduction mechanism on base (1), be equipped with discharge mechanism jointly on base (1) and diaphragm (23).

2. The stainless steel bending machine according to claim 1, wherein the silencing mechanism comprises a first mounting box (16) mounted at the bottom in the first mounting box (2), a second mounting box (17) is arranged in the first mounting box (16), a first piston plate (18) is connected to the inner wall of the second mounting box (17) in a sliding manner, a first connecting rod (13) is fixedly connected to the upper end of the first piston plate (18), the upper end of the first connecting rod (13) respectively penetrates through the upper ends of the first mounting box (16) and the base (1) and is fixedly connected with the lower end of the mounting plate (7), a first spring (19) is fixedly connected to the lower end of the first piston plate (18), the first spring (19) is fixedly connected to the bottom in the second mounting box (17), a water inlet pipe (20) and a water outlet pipe (14) are respectively arranged at the left side and the right side of the first mounting box (16), all install first check valve on inlet tube (20) and outlet pipe (14), the looks remote site of inlet tube (20) and outlet pipe (14) all is linked together with second installation cavity (17), two shower nozzles (12) are installed to the lower extreme symmetry of mounting panel (7), the one end that first mounting box (16) was kept away from in outlet pipe (14) runs through the upper end of base (1) and installs two connecting pipes (15), two the lower extreme of connecting pipe (15) links to each other with shower nozzle (12) that correspond respectively.

3. The stainless steel bending machine according to claim 2, wherein the discharging mechanism comprises a second mounting box (24) mounted at the upper end of a transverse plate (23), a connecting rope (21) is fixedly connected to the upper end of the mounting plate (7), a guide wheel (35) is mounted at the upper end of the transverse plate (23), a second piston plate (25) is slidably connected to the second mounting box (24), one end, far away from the mounting plate (7), of the connecting rope (21) penetrates through the second mounting box (24) and is connected with the left side of the second piston plate (25), the connecting rope (21) is matched with the guide wheel (35), a second spring (26) is fixedly connected to the right end of the second piston plate (25), the second spring (26) is fixedly connected with the inner wall corresponding to the second mounting box (24), an air inlet pipe (28) and an air outlet pipe (27) are arranged at the right side of the second mounting box (24), the left ends of the air inlet pipe (28) and the air outlet pipe (27) extend into the second mounting box (24), the air inlet pipe (28) and the air outlet pipe (27) are respectively provided with a second one-way valve, the upper end of the base (1) is provided with a third mounting box (29), a third mounting cavity (30) is arranged in the third mounting box (29), a third piston plate (36) is connected in the third mounting cavity (30) in a sliding manner, one end of the air outlet pipe (27), far away from the second mounting box (24), is connected with the third mounting box (29), the right end of the third piston plate (36) is fixedly connected with a third spring (32), the right end of the third spring (32) is fixedly connected with the right inner wall of the third mounting cavity (30), the right end of the third piston plate (36) is fixedly connected with a second connecting rod (33), the right end of the second connecting rod (33) penetrates through the right side wall of the third mounting box (29) and is fixedly connected with a push plate (34), an air outlet (31) is formed in the upper end of the third mounting box (29), and the lower end of the air outlet (31) is communicated with the third mounting cavity (30).

4. The stainless steel bending machine according to claim 3, wherein two guiding telescopic rods (11) are symmetrically mounted at the lower end of the mounting plate (7), a fixing plate (9) is fixedly connected to the lower ends of the two guiding telescopic rods (11), short springs (10) are sleeved on the two guiding telescopic rods (11), the upper ends of the two short springs (10) are fixedly connected with the lower end of the corresponding mounting plate (7), and the lower ends of the two short springs (10) are fixedly connected with the upper end of the corresponding fixing plate (9).

5. The stainless steel bending machine according to claim 4, wherein the inner bottom of the first mounting cavity (2) is V-shaped, the two connecting pipes (15) are corrugated pipes, and anti-skid rubber is mounted at the lower ends of the two fixing plates (9).

6. Stainless steel bending machine according to claim 4, wherein the diameter of said air outlet (31) is smaller than that of said air outlet pipe (27), and both said nozzles (12) are atomizing nozzles.

Technical Field

The invention relates to the technical field of stainless steel processing, in particular to a stainless steel bending machine.

Background

Stainless steel is short for acid-resistant stainless steel, and steel types which are resistant to weak corrosive media such as air, steam and water or have stainless properties are called stainless steel, while steel types which are resistant to corrosion of chemical corrosive media are called acid-resistant steel, and stainless steel is generally classified into: martensitic steel, ferritic steel, austenitic-ferritic stainless steel, precipitation hardening stainless steel, and the like, and further, can be divided into: chromium stainless steel, chromium nickel stainless steel, chromium manganese nitrogen stainless steel and the like;

stainless steel bender can process into required form with the stainless steel, but current stainless steel bender can produce great noise when bending the operation, influences the healthy of processing personnel to a certain extent to current bender needs loaded down with trivial details fixed operation, has reduced machining efficiency, places and takes off the stainless steel spare of processing and all needs manual operation, has increased staff's labour.

Disclosure of Invention

The invention aims to solve the defects in the prior art, and provides a stainless steel bending machine.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a stainless steel bender, includes the base, the upper end symmetry of base is fixed with two risers, two the common fixedly connected with diaphragm in upper end of riser, electric hydraulic telescopic handle is installed to the lower extreme of diaphragm, electric hydraulic telescopic handle's flexible end fixedly connected with mounting panel, the processor is installed to the lower extreme of mounting panel, be equipped with first installation cavity in the base, the upper end of base is equipped with an opening and a plurality of water service mouth, every water service mouth and an open-ended lower extreme all are linked together with first installation cavity, the lower extreme of base is equipped with the outlet, the upper end and the first installation cavity in outlet are linked together, install the sprue on the outlet, be equipped with amortization mechanism on the base, be equipped with discharge mechanism on base and the diaphragm jointly.

Preferably, the silencing mechanism comprises a first mounting box mounted at the bottom in the first mounting box, a second mounting box is arranged in the first mounting box, the inner wall of the second mounting box is connected with a first piston plate in a sliding manner, the upper end of the first piston plate is fixedly connected with a first connecting rod, the upper end of the first connecting rod respectively penetrates through the upper ends of the first mounting box and the base and is fixedly connected with the lower end of the mounting plate, the lower end of the first piston plate is fixedly connected with a first spring, the first spring is fixedly connected with the inner bottom of the second mounting box, the left side and the right side of the first mounting box are respectively provided with a water inlet pipe and a water outlet pipe, the water inlet pipe and the water outlet pipe are respectively provided with a first check valve, the opposite ends of the water inlet pipe and the water outlet pipe are respectively communicated with the second mounting box, the lower end of the mounting plate is symmetrically provided with two spray heads, one end of the water outlet pipe far away from the first mounting box penetrates through the upper end of the base and is provided with two connecting pipes, the lower ends of the two connecting pipes are respectively connected with the corresponding spray heads.

Preferably, the discharging mechanism comprises a second mounting box mounted at the upper end of the transverse plate, the upper end of the mounting plate is fixedly connected with a connecting rope, the upper end of the transverse plate is provided with a guide wheel, the second mounting box is internally and slidably connected with a second piston plate, one end of the connecting rope, far away from the mounting plate, penetrates through the second mounting box and is connected with the left side of the second piston plate, the connecting rope is matched with the guide wheel, the right end of the second piston plate is fixedly connected with a second spring, the second spring is fixedly connected with the inner wall corresponding to the second mounting box, the right side of the second mounting box is provided with an air inlet pipe and an air outlet pipe, the left ends of the air inlet pipe and the air outlet pipe both extend into the second mounting box, the air inlet pipe and the air outlet pipe are both provided with second one-way valves, the upper end of the base is provided with a third mounting box, and a third mounting cavity is arranged in the third mounting box, sliding connection has the third piston board in the third installation cavity, the one end that the second installation box was kept away from to the outlet duct is connected with the third installation box, the right-hand member fixedly connected with third spring of third piston board, the right-hand member of third spring and the right side inner wall fixed connection of third installation cavity, the right-hand member fixedly connected with second connecting rod of third piston board, the right-hand member of second connecting rod runs through the right side wall and the fixedly connected with push pedal of third installation box, the upper end of third installation box is equipped with the gas outlet, the lower extreme and the third installation cavity of gas outlet are linked together.

Preferably, two direction telescopic links, two are installed to the lower extreme symmetry of mounting panel the equal fixedly connected with fixed plate of lower extreme of direction telescopic link, two all the cover is equipped with short spring, two on the direction telescopic link the upper end of short spring respectively with the lower extreme fixed connection of the mounting panel that corresponds, two the lower extreme of short spring respectively with the upper end fixed connection of the fixed plate that corresponds.

Preferably, the interior bottom of first installation cavity is the V-arrangement, two the connecting pipe is the bellows, two antiskid rubber is all installed to the lower extreme of fixed plate.

Preferably, the diameter of the air outlet is smaller than that of the air outlet pipe, and the two spray heads adopt atomizing nozzles.

Compared with the prior art, the device has the advantages that:

1. according to the invention, by arranging the structures such as the transverse plate, the electric hydraulic telescopic rod, the mounting plate, the processing device, the guide telescopic rod, the short spring and the fixing plate, the mounting plate is driven to descend by the electric hydraulic telescopic rod, before the bending operation is carried out, the fixing plate can be firstly contacted with a workpiece, the workpiece is fixed under the action of the short spring, so that the workpiece cannot shake when the processing device bends the workpiece, and the processing effect is improved.

2. According to the invention, the silencing mechanism is arranged, when the mounting plate descends to perform bending operation, the first connecting rod drives the first piston plate to descend, so that water in the second mounting cavity is conveyed into the spray head through the water outlet pipe and the connecting pipe, the spray head is an atomizing spray head, the sprayed water mist can reduce the noise generated during processing, and the water can flow into the first mounting cavity again through the water through hole, so that the waste of water resources is reduced.

3. According to the invention, by arranging the discharging mechanism, when the mounting plate descends for processing, the connecting rope can pull the second piston plate to move left, so that outside air is introduced into the second mounting cavity, when the mounting plate moves upwards, the second piston plate is reset under the action of the second spring, so that gas in the second mounting cavity is introduced into the third mounting cavity through the gas outlet pipe, and as the diameter of the gas outlet pipe is far larger than that of the gas outlet, the gas can push the third piston plate to move forwards for a certain distance, so that a workpiece is pushed out and falls into the containing box, then the gas can be discharged along with the gas outlet, and the push plate is reset under the action of the third spring, so that the labor force of workers is effectively reduced while the next processing is facilitated.

Drawings

Fig. 1 is a schematic structural diagram of a stainless steel bending machine according to the present invention;

FIG. 2 is an enlarged view of the structure at A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1;

fig. 5 is a perspective view between the mounting plate and the fixing plate.

In the figure: the device comprises a base 1, a first mounting cavity 2, a block 3, an opening 4, a water through opening 5, an electric hydraulic telescopic rod 6, a mounting plate 7, a processing device 8, a fixing plate 9, a short spring 10, a guide telescopic rod 11, a spray head 12, a first connecting rod 13, a water outlet pipe 14, a connecting pipe 15, a first mounting box 16, a second mounting cavity 17, a first piston plate 18, a first spring 19, a water inlet pipe 20, a connecting rope 21, a vertical plate 22, a transverse plate 23, a second mounting box 24, a second piston plate 25, a second spring 26, a gas outlet pipe 27, a gas inlet pipe 28, a third mounting box 29, a third mounting cavity 30, a gas outlet 31, a third spring 32, a second connecting rod 33, a push plate 34, a guide wheel 35 and a third piston plate 36.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-5, a stainless steel bending machine comprises a base 1, wherein two vertical plates 22 are symmetrically fixed at the upper end of the base 1, a transverse plate 23 is fixedly connected at the upper ends of the two vertical plates 22 together, an electric hydraulic telescopic rod 6 is installed at the lower end of the transverse plate 23, a mounting plate 7 is fixedly connected at the telescopic end of the electric hydraulic telescopic rod 6, a processing device 8 is installed at the lower end of the mounting plate 7, the electric hydraulic telescopic rod 6 can descend the mounting plate 7 to enable the processing device 8 to contact with a workpiece to realize the bending operation of the workpiece, a first mounting cavity 2 is arranged in the base 1, the inner bottom of the first mounting cavity 2 is in a V shape, so that liquid in the first mounting cavity 2 can be conveniently discharged, an opening 4 and a plurality of water through openings 5 are arranged at the upper end of the base 1, the lower ends of each water through opening 5 and one opening 4 are communicated with the first mounting cavity 2, and a water outlet is arranged at the lower end of the base 1, the upper end of the water outlet is communicated with the first installation cavity 2, a block 3 is installed on the water outlet, a certain amount of water is stored in the first installation cavity 2 and used for a noise reduction mechanism, and the block 3 is used for guiding out the water in the first installation cavity 2;

in the invention, a base 1 is provided with a silencing mechanism, the silencing mechanism comprises a first mounting box 16 mounted at the bottom in a first mounting cavity 2, a second mounting cavity 17 is arranged in the first mounting box 16, the inner wall of the second mounting cavity 17 is connected with a first piston plate 18 in a sliding manner, the upper end of the first piston plate 18 is fixedly connected with a first connecting rod 13, the upper end of the first connecting rod 13 respectively penetrates through the upper ends of the first mounting box 16 and the base 1 and is fixedly connected with the lower end of a mounting plate 7, the lower end of the first piston plate 18 is fixedly connected with a first spring 19, the first spring 19 is fixedly connected with the inner bottom of the second mounting cavity 17, the left side and the right side of the first mounting box 16 are respectively provided with a water inlet pipe 20 and a water outlet pipe 14, the water inlet pipe 20 and the water outlet pipe 14 are both provided with a first one-way valve, the first one-way valve on the water inlet pipe 20 only allows water in the first mounting cavity 2 to enter the second mounting cavity 17, a second one-way valve on the water outlet pipe 14 only guides liquid in a second mounting cavity 17 into the connecting pipe 15, opposite ends of the water inlet pipe 20 and the water outlet pipe 14 are communicated with the second mounting cavity 17, two spray heads 12 are symmetrically mounted at the lower end of the mounting plate 7, one end of the water outlet pipe 14, which is far away from the first mounting box 16, penetrates through the upper end of the base 1 and is provided with two connecting pipes 15, the two connecting pipes 15 are corrugated pipes, so that the connecting pipes 15 do not influence the up-and-down movement of the mounting plate 7, the lower ends of the two connecting pipes 15 are respectively connected with the corresponding spray heads 12, and the two spray heads 12 are provided with atomizing nozzles, so that the spray heads 12 can spray atomized water vapor, and noise generated by processing is reduced;

when the electric hydraulic telescopic rod 6 drives the mounting plate 7 to descend for processing, the first connecting rod 13 drives the first piston plate 18 to descend, the first piston plate 18 can extrude water in the bottom space of the second mounting cavity 17, so that water in the second mounting cavity 17 can be sprayed out of steam from the water outlet pipe 14 and the connecting pipe 15 to the spray head 12, noise generated by processing is reduced, when the mounting plate 7 ascends after processing is completed, the first connecting rod 13 can drive the first piston plate 18 to ascend, and water in the first mounting cavity 2 can flow into the inner bottom of the second mounting cavity 17 through the water inlet pipe 20, so that next processing can be conveniently carried out;

in the invention, the base 1 and the transverse plate 23 are provided with a discharging mechanism together, the discharging mechanism comprises a second mounting box 24 mounted at the upper end of the transverse plate 23, the upper end of the mounting plate 7 is fixedly connected with a connecting rope 21, the upper end of the transverse plate 23 is provided with a guide wheel 35, a second piston plate 25 is slidably connected with the second mounting box 24, one end of the connecting rope 21 far away from the mounting plate 7 penetrates through the second mounting box 24 and is connected with the left side of the second piston plate 25, the connecting rope 21 is matched with the guide wheel 35, as shown in the figure I, the connecting rope 21 passes through the guide wheel 35, when the mounting plate 7 descends, the connecting rope 21 can pull the second piston plate 25 to move, the right end of the second piston plate 25 is fixedly connected with a second spring 26, the second spring 26 is fixedly connected with the inner wall corresponding to the second mounting box 24, the right side of the second mounting box 24 is provided with an air inlet pipe 28 and an air outlet pipe 27, the left ends of the air inlet pipe 28 and the air outlet pipe 27 both extend into the second mounting box 24, the air inlet pipe 28 and the air outlet pipe 27 are both provided with a second one-way valve, the second one-way valve on the air inlet pipe 28 only supplies outside air to enter the second mounting box 24, the second one-way valve on the air outlet pipe 27 only supplies air in the second mounting box 24 to be guided into the third mounting cavity 30, the upper end of the base 1 is provided with the third mounting box 29, the third mounting cavity 30 is arranged in the third mounting box 29, the third mounting cavity 30 is connected with a third piston plate 36 in a sliding manner, one end of the air outlet pipe 27 far away from the second mounting box 24 is connected with the third mounting box 29, the right end of the third piston plate 36 is fixedly connected with a third spring 32, the right end of the third spring 32 is fixedly connected with the right inner wall of the third mounting cavity 30, the right end of the third piston plate 36 is fixedly connected with a second connecting rod 33, the right end of the second connecting rod 33 penetrates through the right side wall of the third mounting box 29 and is fixedly connected with a push plate 34, the upper end of the third mounting box 29 is provided with an air outlet 31, the lower end of the gas outlet 31 is communicated with the third installation cavity 30, and the diameter of the gas outlet 31 is smaller than that of the gas outlet pipe 27, so that when the gas outlet pipe 27 discharges gas, the gas outlet pipe can push the third piston plate 36 to move, the second connecting rod 33 drives the push plate 34 to move, and the workpiece is pushed to move and fall into a storage box, wherein the storage box is shown in the figure and is positioned on the front side of the base 1 and used for receiving the machined workpiece;

when the electric hydraulic telescopic rod 6 drives the mounting plate 7 to descend for processing, the connecting rope 21 pulls the second piston plate 25 to move left, so that outside air is led into the second mounting box 24 through the air inlet pipe 28, after processing is completed, the mounting plate 7 moves upwards, under the action of the second spring 26, the second piston plate 25 moves right and is reset, so that air in the second mounting box 24 passes through the air outlet pipe 27 to the third mounting cavity 30, and because the diameter of the air outlet 31 is smaller than that of the air outlet pipe 27, the third piston plate 36 can be pushed to move when the air outlet pipe 27 discharges the air, so that the second connecting rod 33 drives the push plate 34 to move, and workpieces are pushed to move and fall into the storage box, which is shown in the figure and is positioned on the front side of the base 1 and used for receiving the processed workpieces;

according to the invention, two guide telescopic rods 11 are symmetrically installed at the lower end of a mounting plate 7, the lower ends of the two guide telescopic rods 11 are fixedly connected with a fixing plate 9, short springs 10 are sleeved on the two guide telescopic rods 11, the upper ends of the two short springs 10 are fixedly connected with the lower ends of the corresponding mounting plates 7 respectively, the lower ends of the two short springs 10 are fixedly connected with the upper ends of the corresponding fixing plates 9 respectively, anti-skid rubber is installed at the lower ends of the two fixing plates 9, an electric hydraulic telescopic rod 6 is started to drive the mounting plate 7 to descend, before bending operation is carried out, the fixing plate 9 can be firstly contacted with a workpiece, the workpiece is fixed under the action of the short springs 10, when a machining device 8 bends the workpiece, the workpiece cannot shake, and the machining effect is improved.

When the device is used, the electric hydraulic telescopic rod 6 is started to drive the mounting plate 7 to descend, the fixing plate 9 can be firstly contacted with a workpiece, the workpiece is fixed under the action of the short spring 10, and the workpiece cannot shake when the machining device 8 bends the workpiece, so that the machining effect is improved;

when the electric hydraulic telescopic rod 6 drives the mounting plate 7 to descend for processing, the first connecting rod 13 drives the first piston plate 18 to descend, the first piston plate 18 can extrude water in the bottom space of the second mounting cavity 17, so that water in the second mounting cavity 17 can be sprayed to the spray head 12 through the water outlet pipe 14 and the connecting pipe 15, the noise generated by processing is reduced, when the mounting plate 7 ascends after the processing is finished, the first connecting rod 13 can drive the first piston plate 18 to ascend, and the water in the first mounting cavity 2 can flow into the inner bottom of the second mounting cavity 17 through the water inlet pipe 20, so that the next processing can be conveniently carried out;

when the electric hydraulic telescopic rod 6 drives the mounting plate 7 to descend for processing, the connecting rope 21 pulls the second piston plate 25 to move left, so that outside air is led into the second mounting box 24 through the air inlet pipe 28, after processing is completed, the mounting plate 7 moves upwards, under the action of the second spring 26, the second piston plate 25 moves right and is reset, so that air in the second mounting box 24 passes through the air outlet pipe 27 to the third mounting cavity 30, and because the diameter of the air outlet 31 is smaller than that of the air outlet pipe 27, the third piston plate 36 can be pushed to move when the air outlet pipe 27 discharges the air, so that the second connecting rod 33 drives the push plate 34 to move, and workpieces are pushed to move and fall into the storage box, which is shown in the figure and is positioned on the front side of the base 1 and used for receiving the processed workpieces; the device can effectually reduce the noise that produces man-hour through amortization mechanism to discharge mechanism can carry out the ejection of compact automatically, has reduced staff's labour, and loaded down with trivial details fixed operation is avoided in the design of fixed plate 9 and short spring 10, has improved machining efficiency.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.