Dual plunger lubrication pump

Abstract

This utility model discloses a dual-plunger lubrication pump, including a plunger pump component, an electronic control board component, a plunger drive component, and an oil reservoir. The plunger pump component includes a pump body, a first plunger, a second plunger, a first check valve, and a second check valve. The pump body has a first plunger hole, a second plunger hole, an oil suction hole, and an oil outlet hole. The first plunger hole and the second plunger hole are connected to the oil reservoir through the oil suction hole. The oil inlet side and the oil outlet side of the first check valve are connected to the first plunger hole and the oil outlet hole, respectively. The oil inlet side and the oil outlet side of the second check valve are connected to the second plunger hole and the oil outlet hole, respectively. The electronic control board component is electrically connected to the plunger drive component, and the plunger drive component is connected to the first plunger and the second plunger, so that the electronic control board component controls the plunger drive component to drive the first plunger and the second plunger to move alternately. This utility model not only has a simple structure and compact layout, but also significantly increases the oil output.

Description

Technical Field

[0001] This utility model relates to the field of lubrication pump technology, and in particular to a dual-plunger lubrication pump. Background Technology

[0002] Currently, the grease pumps used in progressive centralized lubrication systems and centralized lubrication systems with matching quantitative metering components on the market generally employ a motor that drives an eccentric wheel through a reduction gearbox, thereby pushing a plunger to reciprocate and supply oil. In actual use, this type of structure mainly suffers from the drawback of a relatively small oil pump output.

[0003] There are three ways to increase the oil output of an oil pump during design: a. increase the effective stroke of the plunger; b. increase the cross-sectional area of ​​the plunger; c. increase the frequency of plunger action. While maintaining the pump's output pressure, increasing the plunger stroke means increasing the eccentricity of the eccentric wheel. Increasing the eccentricity requires increasing the required motor drive torque, and increasing the plunger cross-sectional area also requires increasing the motor drive torque. Due to limitations in installation space, cost control, and aesthetic requirements, the motor size should not be too large, and a higher-power motor cannot be selected to obtain higher drive torque. Furthermore, excessively high plunger action frequency will reduce the pump's oil suction capacity, resulting in a generally lower oil output for this type of pump.

[0004] To address the aforementioned issues, the applicant's earlier Chinese utility model patent application number 2025211813358 discloses a lubrication pump for a progressive lubrication system. This pump uses an electronic control board to control a plunger drive component, which drives the plunger to reciprocate within a set range to complete the oil pump's suction and discharge functions. The plunger's stroke does not affect the required output torque of the plunger drive component, thus allowing for a large discharge stroke and a large oil pump output. Compared to traditional designs, this pump has a simpler structure, more reliable operation, and a more compact layout.

[0005] However, the applicant discovered that the lubrication pump could still be improved to increase its oil output. Utility Model Content

[0006] The purpose of this invention is to provide a dual-plunger lubrication pump, which is not only simple in structure and compact in layout, but also can significantly increase the oil output.

[0007] To achieve the above objectives, this utility model provides the following technical solution: including a plunger pump component, an electronic control board component, a plunger drive component, and an oil reservoir; The plunger pump assembly includes a pump body, a first plunger, a second plunger, a first check valve, and a second check valve. The pump body is provided with a first plunger hole, a second plunger hole, an oil suction hole, and an oil outlet hole. The first plunger hole and the second plunger hole are connected to an oil reservoir through the oil suction hole. The oil inlet side and the oil outlet side of the first check valve are connected to the first plunger hole and the oil outlet hole, respectively. The oil inlet side and the oil outlet side of the second check valve are connected to the second plunger hole and the oil outlet hole, respectively. The electronic control board component is electrically connected to the plunger drive component, and the plunger drive component is connected to the first plunger and the second plunger. The first plunger and the second plunger move in opposite directions, so that the electronic control board component controls the plunger drive component to drive the first plunger and the second plunger to move alternately.

[0008] By adopting the above technical solution, the electronic control board controls the plunger drive component to drive the first plunger and the second plunger to move alternately within a set range. That is, the first plunger and the second plunger perform an "out and in" action, and their movement directions are always opposite. When the first plunger drives the suction of oil, the second plunger drives the discharge of oil, and when the second plunger drives the discharge of oil, the first plunger drives the suction of oil. The movement stroke of the first plunger and the second plunger does not affect the output torque of the plunger drive component required. Therefore, a large oil discharge stroke can be designed. The two can achieve uninterrupted continuous oil discharge, which can significantly increase the oil pump output.

[0009] The present invention is further configured such that the plunger driving component includes a motor, a reduction gearbox, a first screw, a first threaded sleeve, a second screw, and a second threaded sleeve. The input end of the reduction gearbox is linked to the motor shaft of the motor. The reduction gearbox has two output ends with opposite rotation directions, which are respectively connected to the first screw and the second screw. The first screw and the second screw rotate in opposite directions. The first threaded sleeve is threadedly engaged with the first screw. The first screw and the first plunger are coaxially arranged. The second threaded sleeve is threadedly engaged with the second screw. The second screw and the second plunger are coaxially arranged. One output end of the reduction gearbox is drivenly connected to the first plunger through the engagement structure of the first screw and the first threaded sleeve, for driving the first plunger to move axially. The other output end of the reduction gearbox is drivenly connected to the second plunger through the engagement structure of the second screw and the second threaded sleeve, for driving the second plunger to move axially.

[0010] By adopting the above technical solution, the motor drives the first and second plungers to move linearly in opposite directions through the reduction gearbox and two sets of screw-sleeve transmission structures. Changing the motor's rotation direction correspondingly alters the transmission direction of the two sets of screw-sleeve transmission structures, thereby changing the movement direction of the first and second plungers. The electronic control board switches the motor's rotation direction based on the positions of the first and second plungers, thus controlling the first and second plungers to move in opposite directions within a corresponding range, meeting the plunger drive requirements. The first screw sleeve and the first plunger, and the second screw sleeve and the second plunger, are designed coaxially; non-coaxial designs should be avoided to prevent bending moments and increased motor load.

[0011] The present invention is further configured such that: the first screw is connected to one of the output ends of the gearbox; the first sleeve is connected to the first plunger; the first sleeve is circumferentially limited by a first limiting mechanism, so that when the first screw rotates, the first sleeve drives the first plunger to move axially; the second screw is connected to the other output end of the gearbox; the second sleeve is connected to the second plunger; the second sleeve is circumferentially limited by a second limiting mechanism, so that when the second screw rotates, the second sleeve drives the second plunger to move axially.

[0012] By adopting the above technical solution, it is the first configuration of the screw sleeve and screw transmission structure. The reduction gearbox drives the first screw and the second screw to rotate. The first screw sleeve and the second screw sleeve move linearly under the action of the first limiting mechanism and the second limiting mechanism, respectively, and drive the first plunger and the second plunger to move back and forth.

[0013] The present invention is further configured such that the first limiting mechanism includes a first limiting rod and a first limiting sleeve, the second limiting mechanism includes a second limiting rod and a second limiting sleeve, the first limiting rod and the second limiting rod are connected to the gearbox, the first limiting sleeve and the second limiting sleeve are respectively disposed on the first threaded sleeve and the second threaded sleeve, and the first limiting sleeve and the second limiting sleeve are respectively in sliding cooperation with the first limiting rod and the second limiting rod.

[0014] By adopting the above technical solution, the rotation of the first and second threaded sleeves can be restricted respectively, thereby enabling them to move in a straight line.

[0015] The present invention is further configured such that the gearbox has two output ends with opposite rotation directions, respectively connected to a first threaded sleeve and a second threaded sleeve, the first threaded sleeve and the second threaded sleeve rotating in opposite directions; the first screw is connected to a first plunger; the first threaded sleeve is connected to one of the output ends of the gearbox; the first threaded sleeve is axially limited, such that when the first threaded sleeve rotates, the first screw drives the first plunger to move axially; the second screw is connected to a second plunger; the second threaded sleeve is connected to the other output end of the gearbox; the second threaded sleeve is axially limited, such that when the second threaded sleeve rotates, the second screw drives the second plunger to move axially.

[0016] By adopting the above technical solution, a second configuration of the screw-sleeve transmission structure is provided. The reduction gearbox drives the first and second screw sleeves to rotate, while the first and second screws move in opposite linear directions, respectively driving the first and second plungers to move alternately in opposite directions. The cantilever lengths of the first and second screws are shortened, resulting in better rigidity of the first and second screws.

[0017] The present invention is further configured such that the motor is located on the same side of the reduction gearbox corresponding to the first screw and the second screw, or on the other side of the reduction gearbox corresponding to the first screw and the second screw.

[0018] By adopting the above technical solution, the motor and the two screws are arranged on opposite sides, that is, the input shaft and the two output shafts of the gearbox are arranged on opposite sides. In this arrangement, there are no other parts on the motor mounting side, the gearbox structure is more compact, and the motor is easy to install and maintain. The motor and the two screws are arranged on the same side, that is, the input shaft and the two output shafts of the gearbox are arranged on the same side, which can reduce the external size of the oil pump in the direction of movement of the first plunger and the second plunger.

[0019] The present invention is further configured such that the motor is a stepper motor or a servo motor.

[0020] By adopting the above technical solution, the position monitoring switch can be eliminated, and the control board can directly position the first and second plungers through a stepper motor or servo motor to complete the oil pump function.

[0021] The present invention is further configured such that the oil suction hole includes a first oil suction hole and a second oil suction hole, the first oil suction hole and the second oil suction hole are respectively connected to the first plunger hole and the second plunger hole, and the first oil suction hole and the second oil suction hole are connected or not connected to each other.

[0022] By adopting the above technical solution, the oil suction hole can be set as two independent or combined and connected to the oil reservoir, which can meet the needs of different plunger strokes and structural layout.

[0023] The present invention is further configured such that the oil outlet includes a first oil outlet and a second oil outlet, the first oil outlet and the second oil outlet are respectively connected to the first plunger hole and the second plunger hole, and the first oil outlet and the second oil outlet are either interconnected or not interconnected.

[0024] By adopting the above technical solution, two independent oil outlets can be set or combined together to meet the needs of different lubrication applications.

[0025] The present invention is further configured such that the pump body is provided with an oil discharge hole, and the two ends of the oil discharge hole are respectively connected to one of the plunger holes and the oil outlet hole.

[0026] By adopting the above technical solution, the oil pump is equipped with the function of pressure relief.

[0027] The present invention is further configured such that the electronic control board component includes a control board and at least two position monitoring switches electrically connected to the control board, wherein a plunger position identification point is fixedly connected to one of the plungers or plunger driving components, and the position monitoring switch is used to detect the plunger position identification point and send a signal to the control board.

[0028] By adopting the above technical solution, the movement direction and movement range of the first and second plungers can be controlled by monitoring the plunger position signal, thereby completing the functions of oil pump suction, oil discharge, and even pressure relief. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure when the second plunger is located at plunger position B in Example 1; Figure 2 This is a schematic diagram of the structure when the second plunger is located at plunger position A in Example 1; Figure 3 This is a schematic diagram of the structure when the second plunger is located at plunger position B in Example 2; Figure 4 This is a schematic diagram of the structure when the second plunger is located at plunger position A in Example 2; Figure 5 This is a schematic diagram of the second motor configuration in Example 3; Figure 6 This is a schematic diagram of the second configuration of the screw sleeve and screw drive structure in Example 4; Figure 7 This is a schematic diagram of the structure when the second plunger is located at plunger position C in Example 5; Figure 8 This is a schematic diagram of the structure when the second plunger is located at plunger position B in Example 5; Figure 9 This is a schematic diagram of the structure when the second plunger is located at plunger position A in Example 5; Figure 10This is a schematic diagram of the structure of Example 6.

[0030] In the diagram: 1. Plunger pump assembly; 11. Pump body; 121. First plunger; 122. Second plunger; 131. First check valve; 132. Second check valve; 141. First plunger bore; 142. Second plunger bore; 15. Suction port; 151. First suction port; 152. Second suction port; 16. Oil outlet port; 161. First oil outlet port; 162. Second oil outlet port; 17. Unloading port; 18. Plunger position identification point; 2. Electronic control board assembly; 21. Control board 22. Position monitoring switch AS; 23. Position monitoring switch BS; 24. Position monitoring switch CS; 3. Plunger drive component; 31. Motor; 32. Gearbox; 331. First screw; 332. Second screw; 341. First threaded sleeve; 342. Second threaded sleeve; 35. First limiting mechanism; 351. First limiting rod; 352. First limiting sleeve; 36. Second limiting mechanism; 361. Second limiting rod; 362. Second limiting sleeve; 4. Oil reservoir. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Example 1: As shown in the attached document Figure 1 and attached Figure 2The illustrated dual-plunger lubrication pump includes a plunger pump assembly 1, an electronic control board assembly 2, a plunger drive assembly 3, and an oil reservoir 4. The plunger pump assembly 1 includes a pump body 11, a first plunger 121, a second plunger 122, a first check valve 131, and a second check valve 132. The pump body 11 has a first plunger hole 141, a second plunger hole 142, an oil suction hole 15, and an oil outlet hole 16. The first plunger hole 141 and the second plunger hole 142 are connected to the oil reservoir 4 through the oil suction hole 15. The first check valve 131... The oil inlet side and the oil outlet side are respectively connected to the first plunger hole 141 and the oil outlet hole 16. The oil inlet side and the oil outlet side of the second one-way valve 132 are respectively connected to the second plunger hole 142 and the oil outlet hole 16. The electronic control board component 2 is electrically connected to the plunger drive component 3. The plunger drive component 3 is connected to the first plunger 121 and the second plunger 122. The first plunger 121 and the second plunger 122 move in opposite directions, so that the electronic control board component 2 controls the plunger drive component 3 to drive the first plunger 121 and the second plunger 122 to move alternately. The electronic control board component 2 controls the plunger drive component 3 to drive the first plunger 121 and the second plunger 122 to move alternately within a set range. That is, the first plunger 121 and the second plunger 122 perform an "out and in" action, and their movement directions are always opposite. When the first plunger 121 drives the suction of oil, the second plunger 122 drives the discharge of oil, and when the second plunger 122 drives the discharge of oil, the first plunger 121 drives the suction of oil. The movement stroke of the first plunger 121 and the second plunger 122 does not affect the required output torque of the plunger drive component 3. Therefore, a large oil discharge stroke can be designed. The two can achieve uninterrupted continuous oil discharge, which can significantly increase the oil pump output.

[0033] The plunger drive component 3 includes a motor 31, a reduction gearbox 32, a first screw 331, a first threaded sleeve 341, a second screw 332, and a second threaded sleeve 342. The input end of the reduction gearbox 32 is linked to the motor shaft of the motor 31. The reduction gearbox 32 has two output ends that rotate in opposite directions, respectively connected to the first screw 331 and the second screw 332. The first screw 331 and the second screw 332 rotate in opposite directions. The first threaded sleeve 341 is threadedly engaged with the first screw 331. The first screw 331 and the first plunger 1... The gearbox 32 is coaxially configured, with the second screw sleeve 342 threadedly engaged with the second screw 332. The second screw 332 is coaxially configured with the second plunger 122. One output end of the gearbox 32 is connected to the first plunger 121 via the engagement structure of the first screw 331 and the first screw sleeve 341, for driving the first plunger 121 to move axially. The other output end of the gearbox 32 is connected to the second plunger 122 via the engagement structure of the second screw 332 and the second screw sleeve 342, for driving the second plunger 122 to move axially. Motor 31 drives the first plunger 121 and the second plunger 122 to move linearly in opposite directions via reduction gearbox 32 and two sets of screw-sleeve transmission structures. Changing the rotation direction of motor 31 changes the transmission direction of the two sets of screw-sleeve transmission structures accordingly, thereby changing the movement direction of the first plunger 121 and the second plunger 122. The electronic control board component 2 switches the rotation direction of motor 31 according to the position of the first plunger 121 and the second plunger 122, thus controlling the first plunger 121 and the second plunger 122 to move back and forth in opposite directions within a corresponding range, satisfying the plunger drive requirements. The first screw sleeve 341 and the first plunger 121, and the second screw sleeve 342 and the second plunger 122 are designed coaxially, and non-coaxial designs should be avoided to prevent bending moments and increase the load on motor 31.

[0034] In this embodiment, the motor 31 is located on the opposite side of the gearbox 32, corresponding to the first screw 331 and the second screw 332. With the motor 31 and the two screws positioned opposite each other, that is, the input shaft and the two output shafts of the gearbox 32 are positioned opposite each other, this arrangement eliminates the need for other components on the motor 31 mounting side, resulting in a more compact structure for the gearbox 32 and easier installation and maintenance of the motor 31.

[0035] The oil outlet 16 includes a first oil outlet 161 and a second oil outlet 162, and the first oil outlet 161 and the second oil outlet 162 are interconnected, so that the oil pump has an oil outlet.

[0036] The electronic control board component 2 includes a control board 21 and a position monitoring switch electrically connected to at least two control boards 21. A plunger position identification point 18 is fixedly connected to the second plunger 122 or the plunger drive component 3. The position monitoring switch is used to detect the position of the plunger position identification point 18 and send a signal to the control board 21. By monitoring the plunger position signal, the moving direction and range of the first plunger 121 and the second plunger 122 are controlled to complete the oil pump's oil suction and discharge functions.

[0037] Example 2: Different from Example 1, as shown in the appendix. Figures 3-4 As shown, in this embodiment, the oil outlet 16 includes a first oil outlet 161 and a second oil outlet 162, and the first oil outlet 161 and the second oil outlet 162 are not connected to each other, so that the oil pump has two oil outlets.

[0038] Example 3: Different from Examples 1 and 2, as shown in the appendix. Figure 5 As shown, in this embodiment, the motor 31 is located on the same side of the reduction gearbox 32 corresponding to the first screw 331 and the second screw 332. The motor 31 and the two screws are located on the same side, that is, the input shaft and the two output shafts of the reduction gearbox 32 are located on the same side, which can reduce the external size of the oil pump in the direction of movement of the first plunger 121 and the second plunger 122.

[0039] Example 4: Different from Examples 1-3, as shown in the appendix. Figure 6 As shown, in this embodiment, the first screw 331 is connected to the first plunger 121, and the first sleeve 341 is connected to one output end of the reduction gearbox 32. The first sleeve 341 is axially limited, so that when the first sleeve 341 rotates, the first screw 331 drives the first plunger 121 to move axially. The second screw 332 is connected to the second plunger 122, and the second sleeve 342 is connected to the other output end of the reduction gearbox 32. The second sleeve 342 is axially limited, so that when the second sleeve 342 rotates, the second screw 332 drives the second plunger 122 to move axially. This is a second configuration of the sleeve-screw transmission structure. The reduction gearbox 32 drives the first sleeve 341 and the second sleeve 342 to rotate, and the first screw 331 and the second screw 332 move in opposite directions in a straight line, respectively driving the first plunger 121 and the second plunger 122 to move alternately in opposite directions. The shortened cantilever lengths of the first screw 331 and the second screw 332 result in better rigidity of the first screw 331 and the second screw 332.

[0040] In embodiments 1 to 4, there are two position monitoring switches, including position monitoring switch AS22 and position monitoring switch BS23. During the displacement process, the second plunger 122 has a plunger position A at the push-out limit point and a plunger position B at the return and opening of the oil suction hole 15. Position monitoring switch AS22 and position monitoring switch BS23 detect the plunger position identification point 18 when the second plunger 122 reaches plunger position A and plunger position B, respectively, and send a signal to the control board 21.

[0041] Examples 1-4 illustrate the structure of a progressive centralized lubrication system.

[0042] Example 5: This example is a quantitative lubrication system, as shown in the attached diagram. Figures 7-9 As shown, in this embodiment, based on any one of embodiments 1 to 4, an oil discharge hole 17 is added to the pump body 11. The two ends of the oil discharge hole 17 are connected to the second plunger hole 142 and the oil outlet hole 16, respectively, so that the oil pump has the function of discharging oil.

[0043] In embodiment 5, there are three position monitoring switches, including position monitoring switch AS22, position monitoring switch BS23, and position monitoring switch CS24. During the movement, the second plunger 122 has a plunger position A at the push-out limit point, a plunger position B at the return and opening of the oil suction hole 15, and a plunger position C at the return and opening of the oil discharge hole 17. The position monitoring switches AS22, BS23, and CS24 detect the plunger position identification point 18 and send a signal to the control board 21 when the second plunger 122 reaches plunger position A, plunger position B, and plunger position C, respectively.

[0044] Example 6: As attached Figure 10 As shown, this embodiment is based on any one of the embodiments 1 to 5, wherein the oil suction hole 15 can also be provided independently, that is, the oil suction hole 15 includes a first oil suction hole 151 and a second oil suction hole 152, the first oil suction hole 151 and the second oil suction hole 152 are respectively connected to the first plunger hole 141 and the second plunger hole 142, and the first oil suction hole 151 and the second oil suction hole 152 are not connected to each other.

[0045] Example 7: Based on any one of Examples 1 to 6, this example uses a stepper motor or a servo motor for motor 31. The position monitoring switch can be eliminated, and the control board 21 directly positions the first plunger 121 and the second plunger 122 via the stepper motor or servo motor to complete the oil pump function.

Claims

1. A dual-plunger lubrication pump, comprising a plunger pump assembly (1), an electronic control board assembly (2), a plunger drive assembly (3), and an oil reservoir (4); characterized in that: The plunger pump component (1) includes a pump body (11), a first plunger (121), a second plunger (122), a first check valve (131), and a second check valve (132). The pump body (11) is provided with a first plunger hole (141), a second plunger hole (142), an oil suction hole (15), and an oil outlet hole (16). The first plunger hole (141) and the second plunger hole (142) are connected to the oil reservoir (4) through the oil suction hole (15). The oil inlet side and the oil outlet side of the first check valve (131) are connected to the first plunger hole (141) and the oil outlet hole (16) respectively. The oil inlet side and the oil outlet side of the second check valve (132) are connected to the second plunger hole (142) and the oil outlet hole (16) respectively. The electronic control board component (2) is electrically connected to the plunger drive component (3). The plunger drive component (3) is connected to the first plunger (121) and the second plunger (122). The first plunger (121) and the second plunger (122) move in opposite directions, so that the electronic control board component (2) controls the plunger drive component (3) to drive the first plunger (121) and the second plunger (122) to move alternately.

2. The dual-piston lubrication pump of claim 1, wherein: The plunger drive component (3) includes a motor (31), a reduction gearbox (32), a first screw (331), a first threaded sleeve (341), a second screw (332), and a second threaded sleeve (342). The input end of the reduction gearbox (32) is linked to the motor shaft of the motor (31). The reduction gearbox (32) has two output ends with opposite rotation directions, which are respectively connected to the first screw (331) and the second screw (332). The first screw (331) and the second screw (332) rotate in opposite directions. The first threaded sleeve (341) is threadedly engaged with the first screw (331). The first screw (331) and the first threaded sleeve (341) are threadedly engaged with the first screw (331). The plunger (121) is coaxially arranged, the second threaded sleeve (342) is threadedly engaged with the second screw (332), the second screw (332) is coaxially arranged with the second plunger (122), one of the output ends of the reduction gearbox (32) is connected to the first plunger (121) through the engagement structure of the first screw (331) and the first threaded sleeve (341) to drive the first plunger (121) to move axially, and the other output end of the reduction gearbox (32) is connected to the second plunger (122) through the engagement structure of the second screw (332) and the second threaded sleeve (342) to drive the second plunger (122) to move axially.

3. The dual-piston lubrication pump of claim 2, wherein: The first screw (331) is connected to one of the output ends of the gearbox (32), and the first sleeve (341) is connected to the first plunger (121). The first sleeve (341) is circumferentially limited by the first limiting mechanism (35), so that when the first screw (331) rotates, the first sleeve (341) drives the first plunger (121) to move axially. The second screw (332) is connected to the other output end of the gearbox (32), and the second sleeve (342) is connected to the second plunger (122). The second sleeve (342) is circumferentially limited by the second limiting mechanism (36), so that when the second screw (332) rotates, the second sleeve (342) drives the second plunger (122) to move axially.

4. The dual-piston lubrication pump of claim 3, wherein: The first limiting mechanism (35) includes a first limiting rod (351) and a first limiting sleeve (352), and the second limiting mechanism (36) includes a second limiting rod (361) and a second limiting sleeve (362). The first limiting rod (351) and the second limiting rod (361) are connected to the gearbox (32). The first limiting sleeve (352) and the second limiting sleeve (362) are respectively disposed on the first threaded sleeve (341) and the second threaded sleeve (342), and the first limiting sleeve (352) and the second limiting sleeve (362) are respectively in sliding cooperation with the first limiting rod (351) and the second limiting rod (361).

5. The dual-piston lubrication pump of claim 2, wherein: The gearbox (32) has two output ends with opposite rotation directions, which are respectively connected to a first threaded sleeve (341) and a second threaded sleeve (342). The first threaded sleeve (341) and the second threaded sleeve (342) rotate in opposite directions. The first screw (331) is connected to the first plunger (121). The first threaded sleeve (341) is connected to one of the output ends of the gearbox (32). The first threaded sleeve (341) is axially limited so that when the first threaded sleeve (341) rotates, the first screw (331) drives the first plunger (121) to move axially. The second screw (332) is connected to the second plunger (122). The second threaded sleeve (342) is connected to the other output end of the gearbox (32). The second threaded sleeve (342) is axially limited so that when the second threaded sleeve (342) rotates, the second screw (332) drives the second plunger (122) to move axially.

6. The dual-piston lubrication pump of claim 2, wherein: The motor (31) is located on the same side of the gearbox (32) corresponding to the first screw (331) and the second screw (332), or on the other side of the gearbox (32) corresponding to the first screw (331) and the second screw (332).

7. The dual-piston lubrication pump of claim 2, wherein: The motor (31) is a stepper motor or a servo motor.

8. The dual-piston lubrication pump of claim 1, wherein: The oil suction hole (15) includes a first oil suction hole (151) and a second oil suction hole (152). The first oil suction hole (151) and the second oil suction hole (152) are respectively connected to the first plunger hole (141) and the second plunger hole (142). The first oil suction hole (151) and the second oil suction hole (152) are connected or not connected to each other. The oil outlet (16) includes a first oil outlet (161) and a second oil outlet (162). The first oil outlet (161) and the second oil outlet (162) are respectively connected to the first plunger hole (141) and the second plunger hole (142). The first oil outlet (161) and the second oil outlet (162) are either connected to each other or not connected to each other.

9. Double-piston lubrication pump according to any of claims 1 to 8, characterized in that The pump body (11) is also provided with an oil discharge hole (17), the two ends of which are connected to the second plunger hole (142) and the oil outlet hole (16) respectively.

10. The dual-piston lubrication pump of claim 1, wherein: The electronic control board component (2) includes a control board (21) and at least two position monitoring switches electrically connected to the control board (21). A plunger position identification point (18) is fixedly connected to the first plunger (121), the second plunger (122), or the plunger drive component (3). The position monitoring switch is used to detect the position of the plunger position identification point (18) and send a signal to the control board (21).

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