阅读说明：本技术 一种油脂定量装置 (Grease proportioning device ) 是由 吴永利 沈国双 王长阳 于 2020-12-30 设计创作，主要内容包括：本发明涉及汽车相关技术领域,公开一种油脂定量装置,包括注脂机构和定量调节机构,注脂机构包括型腔本体、滑动设置于型腔本体内部的活塞组件、与型腔本体连接的液压电控阀、以及固定于型腔本体前端的型腔端盖,活塞将型腔本体的内部分为第一型腔和第二型腔,型腔端盖上设置有进油口和出油口；定量调节机构包括支架、固定于支架上的驱动机构、与驱动机构传动连接的螺杆、与螺杆螺纹连接的固定套筒、以及滑动设置于固定套筒内的柱塞夹头,固定套筒与型腔本体的后端固定连接；柱塞夹头的前端与活塞杆连接,后端与螺杆抵接。本发明注脂精度高、成本低、体积小,输出稳定,能够满足注脂系统定量高速且注脂范围可控可调的要求。(The invention relates to the technical field of automobile correlation, and discloses a grease quantifying device which comprises a grease injecting mechanism and a quantifying adjusting mechanism, wherein the grease injecting mechanism comprises a cavity body, a piston assembly arranged in the cavity body in a sliding manner, a hydraulic electric control valve connected with the cavity body, and a cavity end cover fixed at the front end of the cavity body; the quantitative adjusting mechanism comprises a support, a driving mechanism fixed on the support, a screw rod in transmission connection with the driving mechanism, a fixed sleeve in threaded connection with the screw rod, and a plunger chuck arranged in the fixed sleeve in a sliding manner, and the fixed sleeve is fixedly connected with the rear end of the cavity body; the front end of the plunger chuck is connected with the piston rod, and the rear end of the plunger chuck is abutted against the screw rod. The invention has the advantages of high grease injection precision, low cost, small volume and stable output, and can meet the requirements of high quantification speed and controllable and adjustable grease injection range of a grease injection system.)

1. A grease dosing device, comprising:

the grease injection mechanism comprises a cavity body (11), a piston assembly arranged in the cavity body (11) in a sliding manner, a hydraulic electric control valve (12) connected with the cavity body (11), and a cavity end cover (13) fixed at the front end of the cavity body (11), the piston assembly comprises a piston (14) and a piston rod (15) which are fixedly connected, the piston (14) divides the interior of the cavity body (11) into a first cavity (111) and a second cavity (112), an oil inlet (131) and an oil outlet (132) are arranged on the cavity end cover (13), the oil inlet (131) is always communicated with the second cavity (112), the oil inlet (131) can fill grease into the first cavity (111) through the hydraulic electric control valve (12), and the grease in the first cavity (111) can be discharged out of the oil outlet (132) through the hydraulic electrically-controlled valve (12);

the quantitative adjusting mechanism comprises a support (21), a driving mechanism (22) fixed on the support (21), a screw rod (23) in transmission connection with the driving mechanism (22), a fixed sleeve (24) in threaded connection with the screw rod (23), and a plunger chuck (25) arranged in the fixed sleeve (24) in a sliding manner, the driving mechanism (22) can drive the screw rod (23) to rotate so as to advance or retreat along the fixed sleeve (24), and the fixed sleeve (24) is fixedly connected with the rear end of the cavity body (11); the front end of the plunger chuck (25) is connected with the piston rod (15), and the rear end of the plunger chuck is abutted against the screw rod (23).

2. The grease quantifying device according to claim 1, further comprising an oil outlet detection mechanism, wherein the oil outlet detection mechanism comprises a fixing sleeve (31), an end sensing rod (32), a first pressure spring (33) and a first position sensor (34), a mounting hole (133) is formed in the cavity end cover (13) in a penetrating manner, the fixing sleeve (31) is mounted in the mounting hole (133), the first position sensor (34) is fixed at one end of the fixing sleeve (31), the end sensing rod (32) penetrates the fixing sleeve (31) in a sliding manner, a protrusion (321) is formed in the end sensing rod (32), the end sensing rod (32) is sleeved with the first pressure spring (33), one end of the first pressure spring (33) is connected with the protrusion (321), and the other end of the first pressure spring is connected with the first position sensor (34), the first position sensor (34) is used for detecting the position of the end head sensing rod (32).

3. The grease quantifying device according to claim 1 or 2, further comprising an oil return detection mechanism, wherein the oil return detection mechanism comprises an oil return sliding rod (41), a second pressure spring (42) and a second position sensor (43), the oil return sliding rod (41) is slidably arranged in the screw rod (23), and one end of the oil return sliding rod (41) is fixedly connected with the plunger chuck (25); still be equipped with mounting groove (231) in screw rod (23), second pressure spring (42) cover is located oil return slide bar (41), just the one end of second pressure spring (42) with mounting groove (231) butt, the other end with plunger chuck (25) butt, second position sensor (43) are used for detecting the position of oil return slide bar (41).

4. The grease quantifying device according to claim 1, characterized in that the plunger collet (25) is of a cone-shaped structure, the front end of the screw rod (23) is provided with a plurality of mutually separated elastic claws (232), a tapered groove (233) matched with the shape of the plunger collet (25) is formed between the plurality of elastic claws (232), and when the plunger collet (25) is abutted against the tapered groove (233), the plurality of elastic claws (232) are outwards expanded and locked with the internal thread of the fixed sleeve (24).

5. A grease dosing device according to claim 1, characterized in that the outer circumference of the plunger cartridge (25) is further provided with lugs (251), the inner wall of the fixing sleeve (24) being provided with slide grooves (241) extending axially therealong, the lugs (251) being in sliding connection with the slide grooves (241).

6. A grease dosing device according to claim 3, characterized in that the drive mechanism (22) comprises a servo motor (221) and a gear assembly (222), the servo motor (221) being in driving connection with the screw (23) via the gear assembly (222).

7. A grease dosing device according to claim 6, characterized in that the gear assembly (222) is further covered with a housing (223), the housing (223) is fixedly connected with the bracket (21), and the second position sensor (43) is fixed on the housing (223).

8. A grease dosing device according to claim 1, characterized by a base (5), the fixed sleeve (24) being fixed to the base (5), the bracket (21) being slidably connected to the fixed sleeve (24) by means of a guide rod (6).

9. A grease dosing device according to claim 2, characterized in that sealing rings (7) are provided between the piston rod (15) and the fixing sleeve (24), between the piston (14) and the cavity body (11), and between the end sensing rod (32) and the fixing sleeve (31).

10. The grease dosing device according to claim 1, characterized in that the grease outlet (132) is further connected with a flow detection mechanism for detecting the amount of grease output.

Technical Field

The invention relates to the technical field of automobile correlation, in particular to a grease quantifying device.

Background

In the assembly process of automobile parts, a plurality of places need to be filled with grease, and the grease filling amount is strictly required. At present, grease injection modes in the market are various, and at present, two modes, namely a manual mode and a mechanical mode, exist. The manual grease filling mode is that workers use a quantitative spoon to fill corresponding amount to specific parts each time, and the manual grease filling mode is mainly used for parts which cannot be covered by mechanical equipment. The mechanical grease injection mode is generally used at present, compressed air is adopted as a power source or an electric cylinder is adopted as a power source through a grease injection system; the air power source needs to be provided with an independent air source device, the external volume is large, the cost is high, and the pressure output is unstable due to the compressibility of the air when the pneumatic booster pump of the high-pressure high-viscosity sealing grease is provided; the grease injection system with the electric cylinder as a power source can cause the grease injection precision to be limited due to the precision limitation of the output rod or the extension rod of the electric cylinder, and the requirements of quantitative high speed and controllable and adjustable grease injection range of the grease injection system can not be met.

Disclosure of Invention

Based on the above, the invention aims to provide the grease quantifying device which is high in precision, low in cost, stable in output and controllable and adjustable in grease injection range.

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

a grease dosing device comprising:

the grease injection mechanism comprises a die cavity body, a piston assembly, a hydraulic electric control valve and a die cavity end cover, wherein the piston assembly is arranged in the die cavity body in a sliding mode, the hydraulic electric control valve is connected with the die cavity body, the die cavity end cover is fixed at the front end of the die cavity body, the piston assembly comprises a piston and a piston rod which are fixedly connected, the piston divides the interior of the die cavity body into a first die cavity and a second die cavity, an oil inlet and an oil outlet are formed in the die cavity end cover, the oil inlet is always communicated with the second die cavity, grease can be filled into the first die cavity through the hydraulic electric control valve by the oil inlet, and the grease in the first die cavity can be discharged out of the oil outlet through the;

the quantitative adjusting mechanism comprises a support, a driving mechanism fixed on the support, a screw rod in transmission connection with the driving mechanism, a fixed sleeve in threaded connection with the screw rod, and a plunger chuck arranged in the fixed sleeve in a sliding manner, the driving mechanism can drive the screw rod to rotate so as to advance or retreat along the fixed sleeve, and the fixed sleeve is fixedly connected with the rear end of the cavity body; the front end of the plunger chuck is connected with the piston rod, and the rear end of the plunger chuck is abutted to the screw rod.

As an oil quantification device's preferred scheme, still include the detection mechanism that produces oil, the detection mechanism that produces oil includes fixed cover, end induction rod, first pressure spring and first position sensor, run through on the die cavity end cover and seted up the mounting hole, fixed cover install in the mounting hole, first position sensor is fixed in the one end of fixed cover, the end induction rod slide run through in fixed cover, be equipped with the arch on the end induction rod, first pressure spring cover is located the end induction rod, just the one end of first pressure spring with the arch is connected, the other end with first position sensor connects, first position sensor is used for detecting the position of end induction rod.

As a preferable scheme of the grease quantifying device, the grease quantifying device further comprises an oil return detection mechanism, wherein the oil return detection mechanism comprises an oil return sliding rod, a second pressure spring and a second position sensor, the oil return sliding rod is arranged in the screw in a sliding manner, and one end of the oil return sliding rod is fixedly connected with the plunger chuck; still be equipped with the mounting groove in the screw rod, second pressure spring cover is located the oil return slide bar, just the one end of second pressure spring with the mounting groove butt, the other end with plunger chuck butt, second position sensor is used for detecting the position of oil return slide bar.

As a preferred scheme of the grease quantifying device, the plunger chuck is of a cone-shaped structure, the front end of the screw is provided with a plurality of mutually separated elastic claws, a tapered groove matched with the shape of the plunger chuck is formed between the plurality of elastic claws, and when the plunger chuck is abutted against the tapered groove, the plurality of elastic claws are outwards opened and locked with the internal thread of the fixed sleeve.

As a preferable scheme of the grease quantifying device, the periphery of the plunger chuck is further provided with a lug, the inner wall of the fixed sleeve is provided with a sliding groove extending along the axial direction of the fixed sleeve, and the lug is in sliding connection with the sliding groove.

As a preferred scheme of the grease quantifying device, the driving mechanism comprises a servo motor and a gear assembly, and the servo motor is in transmission connection with the screw through the gear assembly.

As a preferred scheme of the grease quantifying device, the gear assembly is further covered with a shell, the shell is fixedly connected with the support, and the second position sensor is fixed on the shell.

As a preferred scheme of grease proportioning device, still include the base, fixed sleeve is fixed in on the base, the support pass through the guide bar with fixed sleeve sliding connection.

As a preferable scheme of the grease quantifying device, sealing rings are arranged between the piston rod and the fixed sleeve, between the piston and the cavity body and between the end induction rod and the fixed sleeve.

As a preferable scheme of the grease quantifying device, the oil outlet is further connected with a flow detection mechanism for detecting the output grease amount.

The invention has the beneficial effects that:

according to the grease quantifying device provided by the invention, the screw rod is driven to rotate by the driving mechanism, the screw rod moves along the axial direction of the fixed sleeve in the rotating process, and the plunger chuck and the piston assembly synchronously move along the axial direction of the fixed sleeve, so that the size of the first cavity can be adjusted, namely the capacity of the first cavity is changed; when the first cavity is filled with grease, the grease amount at the moment is the grease amount which is preset to be output outwards once. In the process of outputting the grease outwards, the pressure of the second cavity is increased by injecting the grease into the second cavity, so that the piston is pushed to move (advance) towards the first cavity, and meanwhile, the grease in the first cavity is completely discharged outwards through the hydraulic electric control valve; because the grease amount contained in the first cavity is fixed, the grease is quantitatively output. After the primary grease injection is completed, grease is filled into the first cavity through the hydraulic electric control valve, the piston moves (retreats) in the direction of the second cavity under the action of the pressure of the grease in the first cavity, the piston rod and the plunger chuck also retreat synchronously, when the plunger chuck abuts against the screw rod tightly, the plunger chuck and the piston assembly stop retreating, the piston returns to the initial position at the moment, and the grease amount injected into the first cavity reaches the preset value.

The invention can accurately adjust the size of the first cavity by setting the output rotation quantity of the servo motor so as to accurately control the grease quantity output outwards each time, has high quantitative grease injection precision, low cost and small volume, does not need a pneumatic booster pump, has stable pressure output, and can meet the requirements of high quantitative speed and controllable and adjustable grease injection range of a grease injection system.

Drawings

FIG. 1 is a schematic structural diagram of a grease dosing device according to an embodiment of the present invention;

FIG. 2 is a top view of a grease dosing device according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view taken along A-A of FIG. 2;

FIG. 4 is a schematic structural view of the grease dosing device according to the present invention after the housing is removed;

FIG. 5 is a schematic structural view of the grease dosing device according to the embodiment of the present invention after the driving mechanism is removed;

FIG. 6 is a schematic diagram of a piston assembly and plunger chip according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of a fixing sleeve provided in an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a screw according to an embodiment of the present invention;

FIG. 9 is a schematic view of a first partial structure of a grease dosing device according to an embodiment of the present invention;

FIG. 10 is a schematic view of the oil detection mechanism of FIG. 9 with the oil detection mechanism removed;

FIG. 11 is a cross-sectional view of FIG. 10 along a first cross-section;

FIG. 12 is a cross-sectional view of FIG. 10 along a second cross-section;

FIG. 13 is a cross-sectional view of FIG. 10 along a third cross-section;

FIG. 14 is a schematic view of a second partial structure of the grease dosing device according to the embodiment of the present invention;

FIG. 15 is a cross-sectional view of FIG. 14 along a fourth cross-section;

FIG. 16 is a cross-sectional view of FIG. 14 along a fifth cross-section;

FIG. 17 is a cross-sectional view of FIG. 14 along a sixth cross-section;

FIG. 18 is a cross-sectional view of FIG. 14 along a seventh cross-section;

fig. 19 is a sectional view of fig. 14 taken along an eighth cross-section.

In the figure:

11-a cavity body; 111-a first cavity; 112-a second cavity; 12-a hydraulic electrically controlled valve; 121 — a first interface; 122 — a second interface; 123-a third interface; 124-a fourth interface; 13-cavity end cover; 131-an oil inlet; 132-an oil outlet; 133-mounting holes; 14-a piston; 15-a piston rod;

21-a scaffold; 22-a drive mechanism; 221-a servo motor; 222-a gear assembly; 223-a housing; 23-a screw; 231-a mounting groove; 232-elastic claws; 233-tapered groove; 24-a fixed sleeve; 241-a chute; 25-plunger collet; 251-a lug;

31-a fixation sleeve; 32-end sensing rod; 321-a bump; 33-a first compression spring; 34-a first position sensor;

41-oil return slide bar; 42-a second pressure spring; 43-a second position sensor;

5-a base; 6-a guide rod; 7-sealing ring;

101-a first channel; 102-a second channel; 103-a third channel; 104-a fourth channel; 105-a fifth channel; 106-sixth channel; 107-seventh channel.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning. In the present embodiment, "forward" means upward movement in the axial direction of the fixed sleeve 24 in fig. 3, and "backward" means downward movement in the axial direction of the fixed sleeve 24 in fig. 3.

As shown in fig. 1 to 19, the present embodiment provides a grease quantifying device including a grease injecting mechanism and a quantifying adjustment mechanism. Wherein, annotate fat mechanism and include die cavity body 11, slide and set up in the inside piston assembly of die cavity body 11, hydraulic pressure automatically controlled valve 12 of being connected with die cavity body 11, and be fixed in the die cavity end cover 13 of die cavity body 11 front end, piston assembly includes fixed connection's piston 14 and piston rod 15, piston 14 divides into first die cavity 111 and second die cavity 112 with the inside of die cavity body 11, be provided with oil inlet 131 and oil-out 132 on the die cavity end cover 13, oil inlet 131 communicates with second die cavity 112 all the time, oil inlet 131 can be filled into the grease through hydraulic pressure automatically controlled valve 12 to first die cavity 111, and the grease in first die cavity 111 can discharge oil-out 132 through hydraulic pressure automatically controlled valve 12. The quantitative adjusting mechanism comprises a support 21, a driving mechanism 22 fixed on the support 21, a screw 23 in transmission connection with the driving mechanism 22, a fixed sleeve 24 in threaded connection with the screw 23, and a plunger chuck 25 arranged in the fixed sleeve 24 in a sliding manner, the driving mechanism 22 can drive the screw 23 to rotate so as to advance or retreat along the fixed sleeve 24, and the fixed sleeve 24 is fixedly connected with the rear end of the cavity body 11; the plunger holder 25 has a front end connected to the piston rod 15 and a rear end abutting against the screw 23.

According to the grease quantifying device provided by the invention, the screw 23 is driven to rotate by the driving mechanism 22, the screw 23 moves along the axial direction of the fixed sleeve 24 in the rotating process, and the plunger chuck 25 and the piston assembly also move along the axial direction of the fixed sleeve 24 synchronously, so that the size of the first cavity 111 can be adjusted, namely the capacity of the first cavity 111 is changed; when the first cavity 111 is filled with grease, the grease amount at this time is the grease amount preset to be output outwards once. In the process of outputting the grease outwards, the grease is injected into the second cavity 112 to increase the pressure of the second cavity 112, so that the piston 14 is pushed to move (advance) towards the first cavity 111, and simultaneously, the grease in the first cavity 111 is completely discharged outwards through the hydraulic electrically-controlled valve 12; since the amount of grease contained in the first cavity 111 is fixed, the grease is quantitatively delivered. After the grease is injected once, grease is filled into the first cavity 111 through the hydraulic electronic control valve 12, at this time, the piston moves (retreats) in the direction of the second cavity 112 under the action of the pressure of the grease in the first cavity 111, the piston rod 15 and the plunger chuck 25 also synchronously retreat, when the plunger chuck 25 abuts against the screw 23, the plunger chuck 25 and the piston assembly stop retreating, at this time, the piston 14 returns to the initial position, namely, the grease amount injected into the first cavity 111 reaches the preset value.

Preferably, the driving mechanism 22 of the present embodiment includes a servo motor 221 and a gear assembly 222, and the servo motor 221 is in transmission connection with the screw 23 through the gear assembly 222. The servo motor 221 has high control precision, the gear assembly 222 has reliable transmission and stable operation, and the grease injection precision of the grease quantifying device can be improved. Further, the outer part of the gear assembly 222 is covered with a shell 223, the shell 223 is fixedly connected with the support 21, the gear assembly 222 is effectively protected by the shell, and the safety and the service life of the gear assembly are improved. The displacement of the piston 14 corresponding to each circle of rotation of the servo motor is obtained through tests and calculation, the size of the first cavity 111 can be accurately adjusted by setting the output rotation amount of the servo motor 221, so that the amount of grease output outwards each time can be accurately controlled, the quantitative grease injection precision is high, the cost is low, the size is small, a pneumatic booster pump is not needed, the pressure output is stable, and the requirements of a grease injection system for high quantification speed and controllable and adjustable grease injection range can be met.

Further, the grease quantifying device of the embodiment further comprises an oil outlet detection mechanism for detecting that the grease is output in place. This detection mechanism that produces oil includes fixed cover 31, end induction rod 32, first pressure spring 33 and first position sensor 34, the mounting hole 133 has been seted up in running through on the die cavity end cover 13, fixed cover 31 is installed in mounting hole 133, first position sensor 34 is fixed in the one end of fixed cover 31, end induction rod 32 slides and runs through in fixed cover 31, be equipped with protruding 321 on the end induction rod 32, end induction rod 32 is located to first pressure spring 33 cover, and the one end and the protruding 321 of first pressure spring 33 are connected, the other end is connected with first position sensor 34, first position sensor 34 is used for detecting the position of end induction rod 32. In the process of injecting grease outwards, the piston 14 gradually moves towards the front end to push the grease in the first cavity 111 to be discharged outwards through the oil outlet 132, when the front end of the piston rod 15 contacts the end sensing rod 32, the end sensing rod 32 is pushed to move forwards and extrude the first compression spring 33, at this time, the first position sensor 34 acquires an output in-place signal, which indicates that the grease in the first cavity 111 is completely discharged, and the grease injecting process is finished this time. When grease is filled into the first cavity 111 again, the piston assembly retreats, the end induction rod 32 returns to the original position under the action of the elastic force of the first pressure spring 33, and when the piston assembly retreats until the plunger chuck 25 abuts against the screw 23, the first cavity 111 is filled with the grease again. This embodiment can accurately acquire the condition of this grease proportioning device outwards annotating fat through setting up out oil detection mechanism, and control is convenient, has further improved and has annotated the fat precision.

Further, the grease quantifying device of the present embodiment further includes an oil return detection mechanism for detecting whether the grease is filled into the first cavity 111 in place. The oil return detection mechanism comprises an oil return sliding rod 41, a second pressure spring 42 and a second position sensor 43, wherein the oil return sliding rod 41 is arranged in the screw rod 23 in a sliding manner, and one end of the oil return sliding rod 41 is fixedly connected with the plunger chuck 25; an installation groove 231 is further formed in the screw 23, the second compression spring 42 is sleeved on the oil return sliding rod 41, one end of the second compression spring 42 abuts against the installation groove 231, the other end of the second compression spring 42 abuts against the plunger chuck 25, the second position sensor 43 is fixed on the housing 223, and the second position sensor 43 is used for detecting the position of the oil return sliding rod 41. In this embodiment, when grease is filled into the first cavity 111, the piston assembly retreats, and at the same time, the plunger chuck 25 and the oil return sliding rod 41 are pushed to retreat, the second pressure spring 42 is compressed by force, when the plunger chuck 25 abuts against the screw 23, the oil return sliding rod 41 stops moving, and the second position sensor 43 detects a signal of the oil return sliding rod 41, which indicates that the grease is filled into the first cavity 111 at the right position. When the grease is injected again, the piston assembly advances, and the plunger holder 25 and the oil return slide rod 41 also move upward to return to the original position under the elastic force of the second compression spring 42. In the embodiment, the condition that the first cavity 111 is filled with grease can be accurately obtained by arranging the oil return detection mechanism, the control is convenient, and the precision of the grease quantifying device is further improved.

Preferably, as shown in fig. 6-8, the plunger holder 25 of the present embodiment is a cone-shaped structure, the front end of the screw 23 has a plurality of elastic claws 232 separated from each other, a tapered groove 233 adapted to the shape of the plunger holder 25 is formed between the plurality of elastic claws 232, and when the plunger holder 25 abuts against the tapered groove 233, the plurality of elastic claws 232 can be spread outward, so that the plurality of elastic claws 232 abut against and are locked with the internal thread of the fixing sleeve 24, thereby preventing the piston assembly and the plunger holder 25 from further retreating, ensuring that the capacity of the first cavity 111 is not changed, and improving the reliability of the device. The outer periphery of the plunger holder 25 is further provided with a lug 251, the inner wall of the fixing sleeve 24 is provided with a slide groove 241 extending along the axial direction thereof, the lug 251 is connected with the slide groove 241 in a sliding manner, and the movement precision of the plunger holder 25 is improved through the sliding fit of the lug 251 and the slide groove 241.

Further, the grease dosing device of the present embodiment further includes a base 5, and the fixing sleeve 24 is fixed on the base 5. Specifically, the fixing sleeve 24 includes a first connecting section in a cylindrical structure and a second connecting section in a square structure, and an internal thread is provided inside the first connecting section for being in threaded connection with the screw 23; the second connecting section is fixed on the base 5, a through hole is formed in the second connecting section and used for the piston rod 15 to penetrate through, and the through hole is matched with the diameter of the piston rod 15. Further, the sealing rings 7 are respectively arranged between the second connecting section of the piston rod 15 and the fixing sleeve 24, between the piston 14 and the cavity body 11, and between the end induction rod 32 and the fixing sleeve 31 in the embodiment, so that the sealing performance of the whole system is ensured, and the control accuracy and the use reliability of the device are improved. Further preferably, the support 21 is further provided with a guide rod 6, the first connecting section of the fixing sleeve 24 is provided with a flange, the flange is provided with a sliding groove, and the guide rod 6 is arranged in the sliding groove in a penetrating manner, so that the support 21 and the fixing sleeve 24 are slidably connected; by the arrangement, the accuracy and the stability of the movement of the screw 23 are further improved. In addition, in this embodiment, a flow rate detecting mechanism, such as a flow meter, may be connected to the oil outlet 132 to further detect the amount of grease output, so as to provide feedback to the whole apparatus, so as to further adjust the size of the first cavity 111 or modify other structures.

The working principle of the grease injection mechanism of the present invention will be further explained with reference to fig. 10 to 19. In this embodiment, the hydraulic electrically-controlled valve 12 is preferably a three-position four-way solenoid valve, and includes a first port 121, a second port 122, a third port 123 and a fourth port 124. The cavity body 11 is provided with a first channel 101, a third channel 103, a fourth channel 104, a fifth channel 105 and a sixth channel 106, the cavity end cover 13 is provided with a second channel 102, and the second connecting section of the fixing sleeve 24 is provided with a seventh channel 107. The first channel 101 is disposed along the axial direction of the cavity body 11, and one end of the first channel is connected to the first port 121, and the other end is communicated with the second channel 102. The second channel 102 is arranged along the vertical direction of the cavity end cover and is communicated with the first cavity 111. The third passage 103 is provided in the axial direction of the cavity body 11, and has one end communicating with the oil outlet 132 and the other end communicating with the sixth passage 106. The sixth passage 106 is provided in the lateral direction of the cavity body 11 and is connected to the fourth port 124. The fourth channel 104 is arranged along the axial direction of the cavity body 11, one end of the fourth channel is communicated with the oil inlet 131, the other end of the fourth channel is communicated with the seventh channel 107, and the middle part of the fourth channel is communicated with the fifth channel 105. The seventh passage 107 is provided in the transverse direction of the fixed sleeve 24 and communicates with the second cavity 112. The fifth channel 105 is obliquely disposed in the cavity body 11, and one end of the fifth channel is communicated with the fourth channel 104, and the other end is connected to the third port 123. The second interface 122 is vacant and is not connected to any channel.

In this embodiment, when grease is filled into the first cavity 111, the hydraulic electrically controlled valve 12 controls the grease to sequentially enter the first cavity 111 through the oil inlet 131, the fourth channel 104, the fifth channel 105, the third port 123, the first port 121, the first channel 101, and the second channel 102; meanwhile, part of grease in the second cavity 112 sequentially passes through the seventh channel 107, the fourth channel 104, the fifth channel 105, the third port 123, the first port 121, the first channel 101 and the second channel 102 and enters the first cavity 111.

In this embodiment, when grease in the first cavity 111 is output outwards, the hydraulic electrically controlled valve 12 controls the grease to output outwards through the second channel 102, the first channel 101, the first interface 121, the fourth interface 124, the sixth channel 106, the third channel 103 and the oil outlet 132 in sequence; at the same time the injection device fills the second cavity 112 with a portion of the grease.

Of course, the present embodiment can be used to inject other liquids as well as grease quantitatively, and is not limited to the present embodiment.

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.