Automatic screwing device for high pressure pumps

Abstract

The application relates to an automatic screwing device for a high-pressure pump, which comprises a machine body, a three-axis moving platform, a screw placing seat and a pump body placing seat, a clamping jaw air cylinder for clamping screws and a power component are arranged on the three-axis moving platform, a mounting plate is slidably connected to the three-axis moving platform in the vertical direction, and the power component is used for controlling the sliding of the mounting plate; a motor is arranged on the mounting plate, a rod body one is connected to the output shaft of the motor, a sliding block is slidably connected to the rod body one in the vertical direction, a one-way bearing and a matching rod are arranged on the sliding block, the matching rod is connected with the inner ring of the one-way bearing, the bottom end of the matching rod extends out of the rod body one and is located above the clamping jaw air cylinder, the bottom end of the matching rod is matched with an inner hexagonal hole of a head of an inner hexagonal screw, a guide column is arranged on the bottom end of the matching rod, and a plurality of guide inclined surfaces are arranged on the side wall of the guide column. The application can realize screw tightening and installation operation in the pump body assembling process.

Description

Technical Field

[0001] This invention relates to the field of high-pressure pump processing equipment, and in particular to an automatic screw-tightening device for high-pressure pumps. Background Technology

[0002] A high-pressure pump such as Figure 8 As shown, the pump includes a pump body 91 and an end cap 92. The pump body 91 has multiple threaded holes 93, and the end cap 92 has multiple stepped holes 94. During the assembly of the high-pressure pump, the worker places the end cap 92 onto the pump body 91, aligning the multiple stepped holes 94 with the multiple threaded holes 93. Then, the worker manually inserts multiple hexagonal socket head caps into the multiple stepped holes 94, and then uses tools to screw the multiple hexagonal socket head caps into the multiple threaded holes 93, thus completing the connection between the pump body 91 and the end cap 92.

[0003] Assembling a high-pressure pump requires tightening multiple hexagonal screws. Therefore, if the screws are tightened manually during the high-pressure pump production process, only a few high-pressure pumps can be assembled per day, resulting in extremely low assembly efficiency. Thus, it is necessary to design an automatic screw-tightening device to achieve automatic installation of the screws on the high-pressure pump. Summary of the Invention

[0004] This application provides an automatic screw-tightening device for high-pressure pumps, enabling automatic screw installation.

[0005] The automatic screw-tightening device for high-pressure pumps provided in this application adopts the following technical solution: An automatic screw-tightening device for a high-pressure pump includes a body, a three-axis moving platform, a screw placement seat, and a pump body placement seat. The three-axis moving platform is equipped with a gripper cylinder for gripping hexagonal socket screws and a power component. A mounting plate is slidably connected to the three-axis moving platform in the vertical direction. The power component controls the sliding of the mounting plate. A motor is mounted on the mounting plate. A rod is connected to the output shaft of the motor. A slider is slidably connected to the rod in the vertical direction. A one-way bearing and a mating rod are mounted on the slider. The mating rod is connected to the inner ring of the one-way bearing. The bottom end of the mating rod extends out of the rod and is located above the gripper cylinder. The bottom end of the mating rod is adapted to the hexagonal socket hole of the hexagonal socket screw head. A guide post is provided on the bottom end of the mating rod, and multiple guide bevels are provided on the side wall of the guide post.

[0006] By adopting the above technical solution, during the assembly of the high-pressure pump, the three-axis moving platform first moves to position the gripper cylinder to clamp the screw placed on the screw holder. Then, the three-axis moving platform moves to position the clamped screw above the pump body, aligning the screw with a stepped hole and a threaded hole. Next, the three-axis moving platform moves downward, allowing the screw to pass through the stepped hole and abut against the opening of the threaded hole. Then, the power unit drives the mounting plate downward, causing the rod and mating rod to move downward. Because the screws on the screw holder are manually placed, the internal hexagonal socket holes on each screw may be different. Therefore, when the mating rod moves downward, the guide post first penetrates into the internal hexagonal socket hole of the screw head. Then, as the mating rod moves downward, multiple guide bevels abut against the opening of the internal hexagonal socket hole of the screw head, causing the mating rod to rotate and move upward relative to the rod body. The upward rotation of the mating rod drives the slider to slide upward. At this time, the rotation of the mating rod does not affect the slider due to the presence of the one-way bearing. Guided by the inclined plane, the bottom end of the mating rod rotates to align with the hexagonal socket head cap screw head. The bottom end of the mating tube then automatically inserts into the hexagonal socket head cap screw head. As the rod continues to move downwards, it eventually presses the mating rod against the hexagonal socket head cap screw via the sliding block. Then, the gripper cylinder's jaws open, releasing the hexagonal socket head cap screw and allowing the mating rod to pass. The motor and power unit then start. The power unit drives the mounting plate downwards, while the motor drives the rod to rotate. As the rod rotates downwards, it carries the sliding block, which in turn rotates the mating rod via a one-way bearing. This downward rotation of the mating rod causes the hexagonal socket head cap screw to rotate downwards, screwing it into the threaded hole and securing the pump body, thus completing the high-pressure pump assembly.

[0007] Preferably, the mounting plate is provided with a connecting rod, and the end of the connecting rod is provided with a guide block. The guide block is sleeved on the outside of the rod body, and the rod body can rotate relative to the guide block.

[0008] By adopting the above technical solution, radial displacement can be prevented when the rod rotates.

[0009] Preferably, an annular groove is formed on the inner wall of the guide block, and the annular groove and the rod body form a storage cavity for storing rust-preventive oil. The mounting plate is also provided with an oil supply mechanism for automatically supplying oil to the storage cavity. The rod body has a cavity, a channel, and a channel. Channel 1 connects the annular groove and the cavity, and channel 2 connects the cavity and the outside. The opening of channel 2 that connects to the outside faces the ground. Both channel 1 and channel 2 are provided with one-way valves. The slider is slidably connected in the cavity, and a spring is also provided in the cavity. The spring always drives the slider to move downward.

[0010] By adopting the above technical solution, the mating rod is inserted into the hexagonal socket head cap of the socket screw. After the guide post abuts against the bottom wall of the hexagonal socket head cap of the socket screw, the mating rod stops moving, but the rod body continues to move downward. As the rod body moves downward, the slider slides upward within the cavity, compressing the spring. During this upward movement, the slider draws rust-preventive oil from the annular groove into the cavity. The rust-preventive oil drawn into the cavity automatically flows into the channel due to gravity. Subsequently, after the socket screw is screwed into the threaded hole, the power component drives the mounting plate to move upward, and the motor, rod body, and other components to move upward. During the upward movement of the rod body, the spring rebounds, driving the slider to slide downward within the cavity. As the slider slides downward, it pushes out the rust-preventive oil from the channel, spraying it onto the wall of the stepped hole and the socket screw, preventing the socket screw from rusting and facilitating disassembly of the socket screw during later pump maintenance.

[0011] Preferably, the oil supply mechanism includes an oil storage tank on a mounting plate and a connecting pipe for connecting the inner cavity of the oil storage tank and the annular groove. The oil storage tank is always higher than the guide block, and the rust-preventive oil in the oil storage tank can automatically flow into the annular groove.

[0012] By adopting the above technical solution, when the rust-preventive oil in the annular groove is drawn into the cavity, the oil in the oil storage tank will be automatically replenished into the annular groove through the guide block.

[0013] Preferably, there are multiple screw placement seats and pump body placement seats. The machine body is provided with multiple sets of parallel transmission mechanisms. Each transmission mechanism includes two frames inside the machine body, two belt transmission belts respectively mounted on the two frames, a first hydraulic cylinder located inside the machine body and between the two belt transmission belts, and a placement platform mounted on the output shaft of the first hydraulic cylinder. The screw placement seats and pump body placement seats are respectively placed on the corresponding placement platforms, and both ends of the screw placement seats and pump body placement seats are in contact with the belt transmission belts.

[0014] By adopting the above technical solution, setting up multiple screw holders and multiple pump body holders allows workers to place the next set of high-pressure pumps to be assembled onto the pump body holders during production, while simultaneously placing the hex socket head cap screws required for assembling the next set of high-pressure pumps onto the screw holders, thus improving the efficiency of high-pressure pump assembly. The transmission mechanism facilitates the transfer of the screw holders and multiple pump body holders into the machine body without manual placement, reducing the labor intensity of workers.

[0015] Preferably, the frame is provided with a conical positioning block, and the screw placement seat and the pump body placement seat are both provided with positioning grooves that cooperate with the positioning block.

[0016] By adopting the above technical solution, the final transmission position of the screw holder and the pump body holder is defined, ensuring that components such as the gripper cylinder can accurately clamp the hexagonal screw and accurately screw the hexagonal screw into the threaded hole.

[0017] Preferably, the frame is provided with guide plates, and the two guide plates of the same transmission mechanism are respectively located on both sides of the two belts of the same transmission mechanism. The guide plates are used to limit the transmission direction of the screw placement seat and the pump body placement seat, so that the positioning block can be accurately inserted into the positioning slot when the screw placement seat and the pump body placement seat are transmitted.

[0018] By adopting the above technical solution, transmission deviation is prevented when the screw holder and pump body holder are placed on the conveyor belt, thus ensuring the accuracy of the transmission direction.

[0019] The main technical effects of this invention are reflected in the following aspects: 1. This invention enables automatic screw tightening in the production of high-pressure pumps; 2. This invention ensures that the bottom end of the mating rod can be inserted into the hexagonal socket of the head of the hexagonal screw by setting up components such as guide slopes, and ensures that the mating rod can rotate stably with the hexagonal screw when it rotates, so as to efficiently screw the hexagonal screw into the threaded hole. 3. The present invention incorporates a transmission mechanism to improve the assembly efficiency of the high-pressure pump. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of an automatic screw-tightening device.

[0021] Figure 2 yes Figure 1 A magnified view of a portion of point A in the middle.

[0022] Figure 3 yes Figure 1 A schematic diagram of the structure of components such as the three-axis moving platform.

[0023] Figure 4 It is a structural diagram of components such as mounting plate and motor.

[0024] Figure 5 yes Figure 4 A structural schematic diagram of the middle component from another angle.

[0025] Figure 6 Figure 5 A cross-sectional view of the middle component along line BB.

[0026] Figure 7 This is a structural diagram of the bottom end of the rod and the guide post.

[0027] Figure 8 This is an exploded view of the high-pressure pump.

[0028] Reference numerals: 1. Machine body; 11. Three-axis moving platform; 12. Screw holder; 13. Pump body holder; 14. Gripper cylinder; 15. Power unit; 16. Mounting plate; 21. Motor; 22. Rod body one; 23. Slider; 24. One-way bearing; 25. Matching rod; 26. Guide column; 27. Guide slope; 31. Connecting rod; 32. Guide block; 33. Annular groove; 34. Cavity one; 341. Chamber one; 342. Chamber two; 3 43. Chamber 3; 35. Channel 1; 36. Channel 2; 37. Check valve; 38. Spring; 39. Slide groove; 4. Oil supply mechanism; 41. Oil storage tank; 42. Connecting pipe; 5. Transmission mechanism; 51. Frame; 52. Belt conveyor; 53. First oil cylinder; 54. Placement platform; 61. Positioning block; 62. Positioning groove; 63. Guide plate; 7. Storage cavity; 8. Guide rod; 91. Pump body; 92. End; 93. Threaded hole; 94. Stepped hole. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of this application can be more easily understood and mastered.

[0030] Reference Figure 1 and Figure 2 This embodiment of an automatic screw-tightening device for a high-pressure pump includes a body 1, a screw holder 12, and two pump body 91 holders 13. The screw holder 12 has multiple slots, and workers must place the hexagonal socket screws one by one into these slots before assembling and processing the pump bodies 91. Three high-pressure pumps can be placed on one pump body 91 holder 13.

[0031] Reference Figure 1 and Figure 2 The machine body 1 has three or more sets of parallel transmission mechanisms 5. The middle transmission mechanism is used to transmit the screw placement seat 12, and the two side transmission mechanisms 5 are used to transmit the pump body 91 placement seat 13. The transmission mechanism 5 includes two frames 51 fixed inside the machine body 1, two belt transmission belts 52 respectively set on the two frames 51, a first hydraulic cylinder 53 set inside the machine body 1 and located between the two belt transmission belts 52, and a placement platform 54 fixed on the output shaft of the first hydraulic cylinder 53.

[0032] Reference Figure 2Each frame 51 is fixed with a conical positioning block 61 and a guide plate 63. The screw placement seat 12 and the pump body 91 placement seat 13 are each provided with a positioning groove 62 that mates with the positioning block 61. The two guide plates 63 of the same transmission mechanism 5 are located on both sides of the two belts 52 of the same transmission mechanism 5. The guide plates 63 are used to limit the transmission direction of the screw placement seat 12 and the pump body 91 placement seat 13 so that the positioning block 61 can be accurately inserted into the positioning groove 62 when the screw placement seat 12 and the pump body 91 placement seat 13 are transmitted.

[0033] Reference Figure 1 , Figures 3-5 The machine body 1 also houses a three-axis moving platform 11, which includes X / Y / Z three-axis linear modules. The three-axis moving platform 11 can move freely within the machine body 1 along the X, Y, and Z axes. A gripper cylinder 14 for gripping hexagonal screws is mounted on the three-axis moving platform 11. A mounting plate 16 is slidably connected to the three-axis moving platform 11 along the Z-axis, and the mounting plate 16 is located above the gripper cylinder 14. The three-axis moving platform 11 also has a power component 15 for controlling the sliding of the mounting plate 16. The power component 15 is a second hydraulic cylinder, located above the mounting plate 16, and its output shaft is connected to the mounting plate 16.

[0034] Reference Figures 4-6 A motor 21 is mounted on the mounting plate 16, and a rod 22 is coaxially connected to the output shaft of the motor 21. A connecting rod 31 is fixed on the mounting plate 16, and a guide block 32 is provided at the end of the connecting rod 31. The guide block 32 is sleeved on the outside of the rod 22, and the rod 22 can rotate relative to the guide block 32. An annular groove 33 is formed on the inner wall of the guide block 32, and the annular groove 33 and the rod 22 form a storage cavity for storing rust-preventive oil.

[0035] Reference Figures 4-6 The rod body 22 has a cavity 34, a channel 35, and two channels 36. Cavity 34 includes interconnected chambers 341, 342, and 343. Chamber 342 has the largest space. Channel 35 connects the annular groove 33 and chamber 341. Both channels 36 connect chamber 341 to the outside, with the opening of channel 36 facing the gripper cylinder 14. One-way valves 37 are installed in channel 35 and both channels 36. The one-way valve 37 in channel 35 only allows the rust-preventive oil in the storage chamber to flow from channel 35 into cavity 34, while the one-way valve 37 in channel 36 only allows the rust-preventive oil in cavity 34 to flow from channel 36 to the outside.

[0036] Reference Figure 4 and Figure 5The mounting plate 16 is also equipped with an oil supply mechanism 4 for automatically supplying oil to the storage cavity. The oil supply mechanism 4 includes an oil storage tank 41 fixed to the mounting plate 16 by a bracket, and a connecting pipe 42 for connecting the inner cavity of the oil storage tank 41 and the annular groove 33. The connecting pipe 42 is a flexible hose, and the oil storage tank 41 is always higher than the guide block 32, so that the rust-preventive oil in the oil storage tank 41 can automatically flow into the annular groove 33.

[0037] Reference Figure 6 and Figure 7 A slider 23, which is a piston and cylindrical, is slidably connected within chamber 342 along the vertical direction (i.e., the Z-axis direction). A one-way bearing 24 and a mating rod 25 are mounted on the bottom end of slider 23. The mating rod 25 is connected to the inner ring of the one-way bearing 24, and its bottom end extends out of rod body 22 and is positioned above the gripper cylinder 14. The bottom end of the mating rod 25 is fitted into the hexagonal socket of the head of the hexagonal screw. A guide post 26 is formed on the bottom end of the mating rod 25, and multiple interconnected guide bevels 27 are provided on the side wall of the guide post 26.

[0038] Reference Figure 6 A spring 38 is also placed inside cavity three, located above slider 23. The elastic force of spring 38 always acts on slider 23. When there is no external force, spring 38 will press slider 23 against the bottom wall of cavity two 342. A guide rod 8 is fixed to the top of slider 23. The guide rod 8 is rectangular. A groove 39 is opened on the top wall of cavity three 343, and the guide rod 8 is slidably connected in the vertical direction within the groove 39.

[0039] The steps for tightening the screws in the device described in this application are as follows: First, the worker places the screw holder 12 containing the hexagonal socket screws onto two predetermined conveyor belts 52. Then, the two conveyor belts 52 start, moving the screw holder 12 into the machine body 1, causing the two positioning blocks 61 to insert into the two positioning slots 62 of the screw holder 12. The screw holder 12 moves above the placement platform 54. Then, the output shaft of the first hydraulic cylinder 53 extends, causing the placement platform 54 to rise and support the screw holder 12.

[0040] Then, the pump body 91 mounting base 13 containing the high-pressure pump is placed on the two predetermined conveyor belts 52. The two conveyor belts 52 then start, moving the pump body 91 mounting base 13 into the machine body 1, causing the two positioning blocks 61 to insert into the two positioning slots 62 on the pump body 91 mounting base 13. The screw mounting base 12 moves above the mounting platform 54. Then, the output shaft of the first hydraulic cylinder 53 extends, causing the mounting platform 54 to rise and support the pump body 91 mounting base 13, so that the high-pressure pump on the pump body 91 mounting base 13 is at a predetermined height.

[0041] Next, the machine is started. When the machine is started, the three-axis moving platform 11 moves first, causing the gripper cylinder 14 to move to a suitable position and grip the screw placed on the screw holder 12. Then, the three-axis moving platform 11 moves, causing the gripped screw to move above the pump body 91, so that the screw is aligned with a stepped hole 94 and a threaded hole 93.

[0042] Then the three-axis moving platform 11 moves down, causing the screw to pass through the stepped hole 94 and abut against the opening of the threaded hole 93. Then the output shaft of the second cylinder extends to drive the mounting plate 16 to move down, causing the rod 22 and the mating rod 25 to move down. Because the screws on the screw holder 12 are all placed manually, the internal hexagonal holes on each screw may be different.

[0043] As the mating rod 25 moves downward, the guide post 26 first moves into the hexagonal socket of the socket head cap screw head. Subsequently, multiple guide bevels 27 abut against the opening of the hexagonal socket of the socket head cap screw head, causing the mating rod 25 to rotate and the slider 23 to slide upward, compressing the spring 38. The rotation of the mating rod 25 is not affected by the presence of the one-way bearing 24. During the upward sliding motion of the slider 23 within cavity one 34, the slider 23 draws a small portion of the rust-preventive oil from the annular groove 33 into cavity one 34. The rust-preventive oil in the oil reservoir 41 automatically flows into the annular groove 33 due to gravity. The rust-preventive oil drawn into cavity one 34 automatically flows into channel two 36 due to gravity.

[0044] Guided by the guide ramp 27, the bottom end of the mating rod 25 rotates to align with the hexagonal socket head cap of the socket screw. Then, the spring 38 rebounds, driving the slider 23 and the mating rod 25 downwards, allowing the mating rod 25 to insert into the hexagonal socket head cap of the socket screw. Subsequently, the mating rod 25 follows the rod body 22 downwards. Once the guide post 26 abuts against the bottom wall of the hexagonal socket head cap of the socket screw, the mating rod 25 stops moving, but the rod body 22 continues to move downwards. As the rod body 22 moves downwards, the slider 23 slides upwards within the cavity 34, compressing the spring 38. As the rod 22 moves downward, the slider 23 will continue to move upward in the chamber 342, the spring 38 will continue to compress, and the anti-rust oil will be continuously drawn into the chamber 341 and the chamber 342. After the rod 22 stops moving, the spring 38 will press against the slider 23, thereby pressing the timing rod 25 against the internal hex screw.

[0045] Then, the grippers of the gripper cylinder 14 open to release the gripper on the hexagonal screw and avoid the mating rod 25. Then, the motor 21 starts, the output shaft of the second cylinder continues to extend, the mounting plate 16 continues to move downward, and the motor 21 drives the rod body 22 to rotate. When the rod body 22 rotates and moves downward, it will drive the slider 23 to rotate. When the slider 23 rotates, it will drive the mating rod 25 to rotate through the one-way bearing 24. Under the action of the second cylinder and the motor 21, the mating rod finally rotates and moves downward. When the mating rod 25 rotates and moves downward, it will drive the hexagonal screw to rotate and move downward, screwing the hexagonal screw into the threaded hole 93, so that the hexagonal screw fixes the pump body 91 and the end 92.

[0046] As rod 22 rotates and moves downward, the opening of channel 36 gets closer and closer to the stepped hole 94. After the next hex socket screw is tightened, the output shaft of the second cylinder retracts, driving the mounting plate 16 to move upward. The upward movement of the mounting plate 16 will also move rod 22 upward. As rod 22 moves upward, spring 38 will rebound, driving slider 23 to move downward. The downward movement of slider 23 will squeeze the rust-preventive oil in channel 36 out of channel 36, causing the rust-preventive oil to be sprayed onto the hole wall of stepped hole 94 and onto the hex socket screw, preventing the hex socket screw from rusting and facilitating the removal of the hex socket screw during later maintenance of pump body 91.

[0047] Subsequently, when slider 23 moves to contact the bottom wall of chamber 2 342, slider 23 and mating rod 25 will continue to move upward and reset along with rod 1 22. Then, the three-axis moving platform 11 moves to carry the gripper cylinder 14 to clamp the new hexagon socket screw, completing the assembly of the next hexagon socket screw.

[0048] Of course, the above are just typical examples of this application. In addition, this application may have many other specific implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed in this application.

Claims

1. An automatic screw-tightening device for a high-pressure pump, comprising a body (1), a three-axis moving platform (11), a screw placement seat (12), and a pump body (91) placement seat (13), characterized in that: The three-axis moving platform (11) is equipped with a gripper cylinder (14) for gripping hexagonal screws and a power unit (15). A mounting plate (16) is slidably connected to the three-axis moving platform (11) in the vertical direction. The power unit (15) is used to control the sliding of the mounting plate (16). A motor (21) is provided on the mounting plate (16). A rod (22) is connected to the output shaft of the motor (21). A slider (23) is slidably connected to the rod (22) in the vertical direction. The slider (23) is provided with a one-way bearing (24) and a mating rod (25). The mating rod (25) is connected to the inner ring of the one-way bearing (24). The bottom end of the mating rod (25) extends out of the rod body (22) and is located above the gripper cylinder (14). The bottom end of the mating rod (25) is adapted to the internal hexagonal hole of the internal hexagonal screw head. The bottom end of the mating rod (25) is provided with a guide post (26). The side wall of the guide post (26) is provided with multiple guide inclined surfaces (27).

2. The automatic screw-tightening device for a high-pressure pump according to claim 1, characterized in that: The mounting plate (16) is provided with a connecting rod (31), and the end of the connecting rod (31) is provided with a guide block (32). The guide block (32) is sleeved on the outside of the rod body (22), and the rod body (22) can rotate relative to the guide block (32).

3. The automatic screw-tightening device for a high-pressure pump according to claim 2, characterized in that: The inner wall of the guide block (32) has an annular groove (33), which together with the rod body (22) forms a storage cavity for storing rust-preventive oil. The mounting plate (16) is also provided with an oil supply mechanism (4) for automatically supplying oil to the storage cavity. The rod body (22) has a cavity (34), a channel (35), and a channel (36). The channel (35) connects the annular groove (33) and the cavity (34). The channel (36) connects the cavity (34) and the outside. The opening of the channel (36) that connects to the outside faces the ground. Both the channel (35) and the channel (36) are provided with a one-way valve (37). The slider (23) is slidably connected in the cavity (34). The cavity (34) is also provided with a spring (38). The spring (38) always drives the slider (23) to move downward.

4. The automatic screw-tightening device for a high-pressure pump according to claim 3, characterized in that: The oil supply mechanism (4) includes an oil storage tank (41) on a mounting plate (16) and a connecting pipe (42) for connecting the inner cavity of the oil storage tank (41) and the annular groove (33). The oil storage tank (41) is always higher than the guide block (32), and the rust-preventive oil in the oil storage tank (41) can automatically flow into the annular groove (33).

5. An automatic screw-tightening device for a high-pressure pump according to claim 1, characterized in that: The number of screw placement seats (12) and pump body (91) placement seats (13) is multiple. The machine body (1) is provided with multiple sets of parallel transmission mechanisms (5). The transmission mechanism (5) includes two frames (51) located inside the machine body (1), two belt transmission belts (52) respectively located on the two frames (51), a first oil cylinder (53) located inside the machine body (1) and between the two belt transmission belts (52), and a placement platform (54) located on the output shaft of the first oil cylinder (53). The screw placement seats (12) and pump body (91) placement seats (13) are respectively placed on the corresponding placement platforms (54). Both ends of the screw placement seats (12) and pump body (91) placement seats (13) are in contact with the belt transmission belts (52).

6. An automatic screw-tightening device for a high-pressure pump according to claim 5, characterized in that: The frame (51) is provided with a conical positioning block (61), and the screw placement seat (12) and the pump body (91) placement seat (13) are both provided with positioning grooves (62) that cooperate with the positioning block (61).

7. An automatic screw-tightening device for a high-pressure pump according to claim 6, characterized in that: The frame (51) is provided with guide plates (63). The two guide plates (63) of the same transmission mechanism (5) are located on both sides of the two belts (52) of the same transmission mechanism (5). The guide plates (63) are used to limit the transmission direction of the screw placement seat (12) and the pump body (91) placement seat (13) so that the positioning block (61) can be accurately inserted into the positioning groove (62) when the screw placement seat (12) and the pump body (91) placement seat (13) are transmitted.

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