Automatic screw turning device for high-pressure pump

Abstract

The automatic screw turning device comprises a machine body, a three-axis moving platform, a screw containing base and a pump body containing base, a clamping jaw air cylinder used for clamping screws and a power component are arranged on the three-axis moving platform, and a mounting plate is slidably connected to the three-axis moving platform in the vertical direction; the power part is used for controlling the mounting plate to slide; a motor is arranged on the mounting plate, a first rod body is connected to an output shaft of the motor, a sliding block is slidably connected to the interior of the first rod body in the vertical direction, a one-way bearing and a matching rod are arranged on the sliding block, the matching rod is connected with an inner ring of the one-way bearing, and the bottom end of the matching rod extends out of the first rod body and is located above the clamping jaw air cylinder; the bottom end of the matching rod is matched with an inner hexagonal hole in the head of an inner hexagonal screw, a guide column is arranged at the bottom end of the matching rod, and a plurality of guide slopes are arranged on the side wall of the guide column. According to the invention, the screw tightening and mounting operation can be realized in the pump body assembling process.

Description

Technical Field

[0001] The present invention relates to the field of high-pressure pump processing equipment, and particularly to an automatic screw-tightening device for a high-pressure pump. Background Art

[0002] As shown in Figure 8 a high-pressure pump includes a pump body 91 and an end head 92. A plurality of threaded holes 93 are provided on the pump body 91, and a plurality of stepped holes 94 are provided on the end head 92. When assembling the high-pressure pump, a worker places the end head 92 on the pump body 91 so that the plurality of stepped holes 94 are aligned with the plurality of threaded holes 93. Then, a plurality of hexagon socket head cap screws are manually placed into the plurality of stepped holes 94, and then a tool is used to screw the plurality of hexagon socket head cap screws into the plurality of threaded holes 93 to complete the connection between the pump body 91 and the end head 92.

[0003] Assembling a high-pressure pump requires screwing a plurality of hexagon socket head cap screws. Therefore, if the screws are tightened manually during the production process of the high-pressure pump, only a few high-pressure pumps can be assembled in a day, and the assembly efficiency is extremely low. Therefore, it is necessary to design an automatic screw-tightening device to realize the automatic installation of the high-pressure pump screws. Summary of the Invention

[0004] The present application provides an automatic screw-tightening device for a high-pressure pump to realize the automatic installation of screws.

[0005] The automatic screw-tightening device for a high-pressure pump provided by the present application adopts the following technical solutions: An automatic screw-tightening device for a high-pressure pump includes a machine body, a three-axis moving platform, a screw placement seat, and a pump body placement seat. A clamping jaw cylinder for clamping hexagon socket head cap screws and a power component are provided on the three-axis moving platform. An installation plate is slidably connected to the three-axis moving platform in the vertical direction, and the power component is used to control the sliding of the installation plate. A motor is provided on the installation plate, and a first rod is connected to the output shaft of the motor. A slider is slidably connected to the first rod in the vertical direction. A one-way bearing and a mating rod are provided 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 first rod and is located above the clamping jaw cylinder. The bottom end of the mating rod is adapted to the hexagon hole in the head of the hexagon socket head cap screw. A guiding column is provided at the bottom end of the mating rod, and a plurality of guiding inclined surfaces are provided on the side wall of the guiding column.

[0006] By adopting the above technical solution, when assembling the high-pressure pump, first, the three-axis moving platform moves to displace the jaw cylinder to a proper position and pick up the screws placed on the screw placement seat. Then, the three-axis moving platform moves to displace the picked-up screws above the pump body so that the screws are aligned with a stepped hole and a threaded hole. Then, the three-axis moving platform moves downward so that the screws pass through the stepped hole and abut against the orifice of the threaded hole. Then, the power component drives the mounting plate to move downward, causing the first rod body and the mating rod to move downward. Since the screws on the screw placement seat are manually placed, the internal hexagonal holes on each screw may be different. Therefore, when the mating rod moves downward, the guiding post will first penetrate into the internal hexagonal hole of the internal hexagonal screw head. Then, as the mating rod moves downward, multiple guiding inclined surfaces will abut against the orifice of the internal hexagonal hole of the internal hexagonal screw head, causing the mating rod to rotate and move upward relative to the first rod body. When the mating rod rotates and moves upward, it will drive the slider to slide upward. At this time, when the mating rod rotates, it will not affect the slider due to the existence of the one-way bearing. Under the guidance of the guiding inclined surface, finally, the bottom end of the mating rod will rotate to align with the internal hexagonal hole of the internal hexagonal screw head, and then the bottom end of the mating pipe will automatically insert into the internal hexagonal hole of the internal hexagonal screw head. Then, as the first rod body continues to move downward, finally, the first rod body will press the mating rod against the internal hexagonal screw by pressing the slider. Then, the jaws of the jaw cylinder open to cancel the clamping of the internal hexagonal screw and avoid the mating rod. Then, the motor and the power component are started. The power component drives the mounting plate to move downward, and when the motor is started, it drives the first rod body to rotate. When the first rod body rotates and moves downward, it will drive the slider to rotate. When the slider rotates, it will drive the mating rod to rotate through the one-way bearing, causing the mating rod to rotate and move downward. When the mating rod rotates and moves downward, it will drive the internal hexagonal screw to rotate and move downward, screwing the internal hexagonal screw into the threaded hole to fix the pump body and the pump body, completing the production and assembly of the high-pressure pump.

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

[0008] By adopting the above technical solution, it is possible to prevent radial deviation when the first rod body rotates.

[0009] Preferably, an annular groove is formed on the inner wall of the guiding block, and the annular groove and the first rod body form a storage cavity for storing anti-rust oil. An oil supply mechanism for automatically supplying oil to the storage cavity is further provided on the mounting plate; a first cavity, a first channel, and a second channel are formed in the first rod body. The first channel communicates with the annular groove and the first cavity, and the second channel communicates with the first cavity and the outside. The channel opening of the second channel communicating with the outside faces the ground. One-way valves are provided in both the first channel and the second channel; the slider is slidably connected in the first cavity, and a spring is further provided in the first cavity. The spring always drives the slider to move downward.

[0010] By adopting the above technical solution, the mating rod rotates and inserts into the hexagonal socket of the hexagon socket screw head. After the guide post abuts against the bottom wall of the hexagonal socket of the hexagon socket screw head, the mating rod stops moving, but the rod body continues to move downward for a while. As the rod body moves downward, the slider slides upward in the first cavity and compresses the spring. During the process of the slider sliding upward in the first cavity, the slider pumps the rust preventive oil in the annular groove into the first cavity. The rust preventive oil pumped into the first cavity will automatically flow into the second channel due to gravity. After the hexagon socket screw is screwed into the threaded hole, the power component drives the mounting plate, the motor, the rod body and other components to move upward. During the upward movement of the rod body, the spring rebounds and drives the slider to slide downward in the first cavity. During the downward sliding of the slider, the rust preventive oil in the channel is pressed out, so that the rust preventive oil is sprayed onto the hole wall of the stepped hole and the hexagon socket screw, preventing the hexagon socket screw from rusting and facilitating the disassembly of the hexagon socket screw during the later maintenance of the pump body.

[0011] Preferably, the oil supply mechanism includes an oil storage tank provided on the mounting plate and a connecting pipe for communicating 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 pumped into the first cavity, the oil in the oil storage tank will be automatically replenished into the annular groove through the guide block.

[0013] Preferably, the number of the screw placing seats and the pump body placing seats is multiple. The machine body is provided with multiple groups of parallel transmission mechanisms. The transmission mechanism includes two frames provided inside the machine body, two belt conveyors respectively provided on the two frames, a first oil cylinder provided inside the machine body and located between the two belt conveyors, and a placing table provided on the output shaft of the first oil cylinder. The screw placing seats and the pump body placing seats are respectively placed on the corresponding placing tables, and both ends of the screw placing seats and the pump body placing seats are in contact with the belt conveyors.

[0014] By adopting the above technical solution, setting multiple screw placing seats and multiple pump body placing seats enables workers to place the next high-pressure pump to be assembled on the pump body placing seat and at the same time place the hexagon socket screws required for assembling the next high-pressure pump on the screw placing seat when a group of high-pressure pumps are being produced, improving the assembly efficiency of the high-pressure pump. The setting of the transmission mechanism facilitates the transmission of the screw placing seats and multiple pump body placing seats 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 placing seats and the pump body placing seats are both provided with positioning grooves matching the positioning block.

[0016] By adopting the above technical solution, the final transmission positions of the screw placement seat and the pump body placement seat are defined, ensuring that components such as the jaw cylinder can accurately grip the hexagon socket head screw and accurately screw the hexagon socket head screw into the threaded hole.

[0017] Preferably, a guiding plate is provided on the frame body. The two guiding plates of the same transmission mechanism are respectively located on both sides of the two belt conveyors of the same transmission mechanism. The guiding plate is used to define the transmission direction of the screw placement seat and the pump body placement seat, so that the positioning block can accurately insert into the positioning slot when the screw placement seat and the pump body placement seat are transmitted.

[0018] By adopting the above technical solution, it is possible to prevent the transmission deviation when the screw placement seat and the pump body placement seat are placed on the belt conveyor, ensuring the accuracy of the transmission direction.

[0019] The technical effects of the present invention are mainly reflected in the following aspects: 1. The present invention realizes the automatic screw tightening in the production of high-pressure pumps; 2. The present invention ensures that the bottom end of the mating rod can be inserted into the hexagon hole in the head of the hexagon socket head screw by setting components such as a guiding inclined plane, ensuring that the mating rod can stably drive the hexagon socket head screw to rotate together when rotating, and efficiently screwing the hexagon socket head screw into the threaded hole; 3. The present invention sets up a transmission mechanism to improve the assembly efficiency of the high-pressure pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the automatic screw tightening device.

[0021] Figure 2 is Figure 1 partial enlarged view of A in

[0022] Figure 3 is Figure 1 schematic structural diagram of components such as the three-axis moving platform in

[0023] Figure 4 schematic structural diagram of components such as the mounting plate and the motor.

[0024] Figure 5 is Figure 4 schematic structural diagram of the components from another angle in

[0025] Figure 6 Figure 5 cross-sectional view of the components along the B-B line in

[0026] Figure 7 schematic structural diagram of the bottom end of the mating rod and the guiding column.

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

[0028] Reference numerals: 1, body; 11, three-axis moving platform; 12, screw placement seat; 13, pump body placement seat; 14, jaw cylinder; 15, power component; 16, mounting plate; 21, motor; 22, first rod; 23, slider; 24, one-way bearing; 25, mating rod; 26, guiding column; 27, guiding inclined surface; 31, connecting rod; 32, guiding block; 33, annular groove; 34, first cavity; 341, first chamber; 342, second chamber; 343, third chamber; 35, first passage; 36, second passage; 37, one-way valve; 38, spring; 39, chute; 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 table; 61, positioning block; 62, positioning groove; 63, guiding plate; 7, storage cavity; 8, guiding rod; 91, pump body; 92, end; 93, threaded hole; 94, stepped hole. Detailed implementation mode

[0029] The present invention will be further described in detail below with reference to the accompanying drawings, so that the technical solution of the present application is easier to understand and master.

[0030] Refer to Figure 1 and Figure 2 , an automatic screw-tightening device for a high-pressure pump in this embodiment includes a body 1, a screw placement seat 12, and two pump body 91 placement seats 13. A plurality of placement grooves are provided on a screw placement seat 12. Before the assembly and processing of the pump body 91, workers need to place the hexagon socket head cap screws into the placement grooves one by one. Three high-pressure pumps can be placed on one pump body 91 placement seat 13.

[0031] Refer to Figure 1 and Figure 2 , there are three groups of multiple sets of parallel transmission mechanisms 5 on the body 1. The middle transmission mechanism is used to transmit the screw placement seat 12, and the transmission mechanisms 5 on both sides are used to transmit the pump body 91 placement seats 13. The transmission mechanism 5 includes two frames 51 fixed inside the body 1, two belt conveyors 52 respectively arranged on the two frames 51, a first oil cylinder 53 arranged inside the body 1 and between the two belt conveyors 52, and a placement table 54 fixed on the output shaft of the first oil cylinder 53.

[0032] Refer to Figure 2, a conical positioning block 61 and a guiding plate 63 are fixedly installed on each frame body 51, and positioning grooves 62 matching the positioning block 61 are provided on the screw placement seat 12 and the pump body 91 placement seat 13. The two guiding plates 63 of the same transmission mechanism 5 are respectively located on both sides of the two belt conveyor belts 52 of the same transmission mechanism 5. The guiding plate 63 is used to define 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] Refer to Figure 1 、 Figures 3 - 5 , a three-axis moving platform 11 is further installed in the machine body 1. The three-axis moving platform 11 includes X / Y / Z three-direction linear modules. The three-axis moving platform 11 of the present application can move freely in the machine body 1 along the X-axis, Y-axis, and Z-axis directions. A jaw cylinder 14 for clamping internal hexagonal screws is installed on the three-axis moving platform 11. At the same time, a mounting plate 16 is slidably connected to the three-axis moving platform 11 along the Z-axis direction, and the mounting plate 16 is located above the jaw cylinder 14. A power component 15 for controlling the sliding of the mounting plate 16 is also provided on the three-axis moving platform 11. The power component 15 is a second oil cylinder. The second oil cylinder is located above the mounting plate 16, and the output shaft of the second oil cylinder is connected to the mounting plate 16.

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

[0035] Refer to Figures 4 - 6 , a cavity one 34, a channel one 35, and two channels two 36 are formed in the rod body one 22. The cavity one 34 includes a chamber one 341, a chamber two 342, and a chamber three 343 that are connected to each other. The space of the chamber two 342 is the largest. The channel one 35 communicates with the annular groove 33 and the chamber one 341. Both of the two channels two 36 communicate with the chamber one 341 and the outside. The channel openings of the channels two 36 communicating with the outside face the jaw cylinder 14. Check valves 37 are provided in the channel one 35 and the two channels two 36. The check valve 37 provided in the channel one 35 only allows the anti-rust oil in the storage cavity to flow into the cavity one 34 from the channel one 35, and the check valve 37 provided in the channel two 36 only allows the anti-rust oil in the cavity one 34 to flow to the outside from the channel two 36.

[0036] Refer to Figure 4 and Figure 5, an oil supply mechanism 4 for automatically supplying oil to the storage cavity is further provided on the mounting plate 16. The oil supply mechanism 4 includes an oil storage tank 41 fixed to the mounting plate 16 through a bracket, and a connecting pipe 42 for communicating the inner cavity of the oil storage tank 41 and the annular groove 33. The connecting pipe 42 is a flexible pipe, and the oil storage tank 41 is always higher than the guiding block 32, so that the rust preventive oil in the oil storage tank 41 can automatically flow into the annular groove 33.

[0037] Referring to Figure 6 and Figure 7 , a slider 23 is slidably connected in the second chamber 342 along the vertical direction (i.e., the Z-axis direction). The slider 23 is a piston and is cylindrical. A one-way bearing 24 and a mating rod 25 are installed on the bottom end of the slider 23. 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 first rod body 22 and is located above the jaw cylinder 14. The bottom end of the mating rod 25 is adapted to the inner hexagonal hole of the inner hexagonal screw head. A guiding column 26 is formed on the bottom end of the mating rod 25, and a plurality of interconnected guiding inclined surfaces 27 are provided on the side wall of the guiding column 26.

[0038] Referring to Figure 6 , a spring 38 is further placed in the third cavity. The spring 38 is located above the slider 23, and the elastic force of the spring 38 always acts on the slider 23. When there is no external force, the spring 38 will press the slider 23 against the bottom wall of the second chamber 342. A guiding rod 8 is fixed to the top of the slider 23. The guiding rod 8 is rectangular. A sliding groove 39 is formed on the top wall of the third chamber 343, and the guiding rod 8 is slidably connected in the sliding groove 39 along the vertical direction.

[0039] The steps of screwing the screw of the device in this application are as follows: First, the worker places the screw placement seat 12 with the inner hexagonal screw on the predetermined two belt conveyors 52. Then, the two belt conveyors 52 are started to drive the screw placement seat 12 to move into the machine body 1, so that the two positioning blocks 61 are inserted into the two positioning grooves 62 of the screw placement seat 12, and the screw placement seat 12 moves to above the placement table 54. Then, the output shaft of the first oil cylinder 53 extends to lift the placement table 54 to support the screw placement seat 12.

[0040] Then, the pump body 91 placement seat 13 with the high-pressure pump is placed on the predetermined two belt conveyors 52. Then, the two belt conveyors 52 are started to drive the pump body 91 placement seat 13 to move into the machine body 1, so that the two positioning blocks 61 are inserted into the two positioning grooves 62 on the pump body 91 placement seat 13, and the screw placement seat 12 moves to above the placement table 54. Then, the output shaft of the first oil cylinder 53 extends to lift the placement table 54 to support the pump body 91 placement seat 13, so that the high-pressure pump on the pump body 91 placement seat 13 is at a predetermined height.

[0041] Then start the machine. When the machine starts, first, the three-axis moving platform 11 moves so that the gripper cylinder 14 is displaced to a suitable position and picks up the screw placed on the screw placement seat 12. Then, the three-axis moving platform 11 moves so that the picked-up screw is displaced above the pump body 91, aligning the screw with a stepped hole 94 and a threaded hole 93.

[0042] Then the three-axis moving platform 11 moves downward so that the screw passes through the stepped hole 94 and abuts against the orifice of the threaded hole 93. Then, the output shaft of the second oil cylinder extends to drive the mounting plate 16 to move downward, causing the first rod 22 and the mating rod 25 to move downward. Since the screws on the screw placement seat 12 are manually placed, the hexagon sockets in each screw may be different.

[0043] When the mating rod 25 moves downward, the guide post 26 will first move into the hexagon socket of the hexagon head of the hexagon screw. Subsequently, multiple guide slopes 27 will abut against the orifice of the hexagon socket of the hexagon head of the hexagon screw, causing the mating rod 25 to rotate and the slider 23 to slide upward, compressing the spring 38. When the mating rod 25 rotates, the slider 23 will not be affected due to the presence of the one-way bearing 24. During the process of the slider 23 sliding upward in the first cavity 34, the slider 23 will draw a small amount of anti-rust oil in the annular groove 33 into the first cavity 34. The anti-rust oil in the oil storage tank 41 will automatically flow into the annular groove 33 under the action of gravity. The anti-rust oil drawn into the first cavity 34 will automatically flow into the second channel 36 due to gravity.

[0044] Under the guidance of the guide slope 27, finally, the bottom end of the mating rod 25 will rotate to align with the hexagon socket of the hexagon head of the hexagon screw. Then, the spring 38 rebounds to drive the slider 23 and the mating rod 25 to move downward, causing the mating rod 25 to insert into the hexagon socket of the hexagon head of the hexagon screw. Subsequently, the mating rod 25 follows the first rod 22 to move downward. When the guide post 26 abuts against the bottom wall of the hexagon socket of the hexagon head of the hexagon screw, the mating rod 25 stops moving, but the first rod 22 will continue to move downward. As the first rod 22 moves downward, the slider 23 will slide upward in the first cavity 34 and cause the spring 38 to be compressed. During the subsequent downward movement of the first rod 22, the slider 23 will continuously move upward in the second chamber 342, the spring 38 will continue to be compressed, and the anti-rust oil will continuously be drawn into the first chamber 341 and the second chamber 342. After the first rod 22 stops moving, the spring 38 will press against the slider 23, thereby pressing the mating rod 25 against the hexagon screw.

[0045] Then, the jaws of the jaw cylinder 14 open to cancel the clamping of the hexagon socket screw and avoid the mating rod 25. Then, the motor 21 starts, and the output shaft of the second oil cylinder continues to extend. The mounting plate 16 continues to move downward. When the motor 21 starts, the first rod body 22 rotates. When the first 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 oil cylinder and the motor 21, finally, the mating rod rotates and moves downward. When the mating rod 25 rotates and moves downward, it will drive the hexagon socket screw to rotate and move downward, and screw the hexagon socket screw into the threaded hole 93 to fix the pump body 91 and the end 92 with the hexagon socket screw.

[0046] During the process of the first rod body 22 rotating and moving downward, the channel opening of the second channel 36 gets closer and closer to the stepped hole 94. After a hexagon socket screw is screwed in, the output shaft of the second oil cylinder retracts to drive the mounting plate 16 to move upward. When the mounting plate 16 moves upward, it will drive the first rod body 22 to move upward. When the first rod body 22 moves upward, the spring 38 will rebound to drive the slider 23 to move downward. When the slider 23 moves downward, it will squeeze the rust preventive oil in the second channel 36 out of the second channel 36, so that the rust preventive oil is sprayed onto the hole wall of the stepped hole 94 and the hexagon socket screw to prevent the hexagon socket screw from rusting and facilitate the disassembly of the hexagon socket screw during the later maintenance of the pump body 91.

[0047] Subsequently, when the slider 23 moves to abut against the bottom wall of the second chamber 342, the slider 23 and the mating rod 25 will continue to move upward and reset following the first rod body 22. Then, the three-axis moving platform 11 moves to drive the jaw cylinder 14 to clamp a new hexagon socket screw to complete the assembly of the next hexagon socket screw.

[0048] Of course, the above are only typical examples of this application. In addition, this application can also have many other specific implementation manners. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope protected by this application.

Claims

1. An automatic screw-tightening device for a high-pressure pump, comprising a machine 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 provided with a jaw cylinder (14) for clamping an internal hexagonal screw and a power component (15). An installation plate (16) is slidably connected to the three-axis moving platform (11) in the vertical direction, and the power component (15) is used to control the sliding of the installation plate (16); a motor (21) is provided on the installation plate (16), a first rod (22) is connected to the output shaft of the motor (21), a slider (23) is slidably connected to the first rod (22) in the vertical direction, a one-way bearing (24) and a mating rod (25) are provided on the slider (23), 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 first rod (22) and is located above the jaw cylinder (14), the bottom end of the mating rod (25) is adapted to the internal hexagonal hole of the head of the internal hexagonal screw, a guide post (26) is provided at the bottom end of the mating rod (25), and a plurality of guide inclined surfaces (27) are provided on the side wall of the guide post (26).

2. The automatic screw-tightening device for a high-pressure pump according to claim 1, characterized in that: A connecting rod (31) is provided on the installation plate (16), a guide block (32) is provided at the end of the connecting rod (31), the guide block (32) is sleeved outside the first rod (22), and the first rod (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: An annular groove (33) is formed on the inner wall of the guide block (32), and the annular groove (33) and the first rod (22) form a storage cavity for storing anti-rust oil. An oil supply mechanism (4) for automatically supplying oil to the storage cavity is further provided on the installation plate (16); a first cavity (34), a first channel (35), and a second channel (36) are formed in the first rod (22), the first channel (35) communicates with the annular groove (33) and the first cavity (34), the second channel (36) communicates with the first cavity (34) and the outside, the channel port of the second channel (36) communicating with the outside faces the ground, and one-way valves (37) are provided in both the first channel (35) and the second channel (36); the slider (23) is slidably connected in the first cavity (34), and a spring (38) is further provided in the first cavity (34), and 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) provided on the installation plate (16) and a connecting pipe (42) for communicating 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 anti-rust oil in the oil storage tank (41) can automatically flow into the annular groove (33).

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

6. The automatic screw-tightening device for a high-pressure pump according to claim 5, characterized in that: Conical positioning blocks (61) are provided on the frame bodies (51). Positioning grooves (62) that cooperate with the positioning blocks (61) are provided on both the screw placement seats (12) and the pump body (91) placement seats (13).

7. The automatic screw tightening device for a high-pressure pump according to claim 6, characterized in that: Guide plates (63) are provided on the frame bodies (51). The two guide plates (63) of the same transmission mechanism (5) are respectively located on both sides of the two belt transmission belts (52) of the same transmission mechanism (5). The guide plates (63) are used to define the transmission directions of the screw placement seats (12) and the pump body (91) placement seats (13), so that the positioning blocks (61) can be accurately inserted into the positioning grooves (62) when the screw placement seats (12) and the pump body (91) placement seats (13) are transmitted.

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