Gear pump shaft sleeve press fitting device

Abstract

A gear pump shaft sleeve press-fitting device belongs to the field of shaft sleeve press-fitting devices and comprises a bottom plate and a top plate, the bottom plate and the top plate are fixedly connected through a plurality of connecting rods, the bottom plate is provided with a containing groove used for containing a gear pump body, the connecting rods are slidably provided with a same moving plate capable of moving up and down, and the moving plate is fixedly provided with a pressing head. The movable plate and the bottom plate are elastically connected through a plurality of first springs, a gear is rotationally installed on the top plate, and a rack is arranged on one side of the gear in a meshed and matched mode. The device is simple in structure and ingenious in conception, when the shifting rod is shifted in the forward direction, the box body and the nut are driven to rotate synchronously, at the moment, the threaded rod is limited by the limiting mechanism and cannot rotate, the threaded rod is forced to move in the axial direction of the nut, then the sliding plate is pushed to compress the spring rod, and along with increase of the compression stroke, the force needed for disengaging the spring rod from the ball groove is continuously increased; therefore, the overload protection threshold value is dynamically increased, the press-fitting reliability and the operation efficiency are improved, the actual requirements can be met, and the device is suitable for popularization.

Description

Technical Field

[0001] The invention belongs to the field of shaft sleeve press-fitting devices, in particular to a shaft sleeve press-fitting device for a gear pump. Background Art

[0002] Gear pumps, as hydraulic power components with compact structure, reliable operation and low cost, are widely used in engineering machinery, agricultural machinery, industrial equipment and other fields. Its core components include meshing gear pairs, a pump body that houses the gears, and a sleeve that supports the gear shaft and ensures the sealing of the pump chamber. The sleeve is usually press-fitted into the shaft hole of the pump body with an interference fit. The sleeve press-fitting process has multiple stages, and the pressure required for each step is different. For example, the pressure required in the positioning stage is low, while the pressure required in the later stages increases dramatically. Due to the different pressures required in each stage, the corresponding pressure overload protection threshold is also different. The pressure overload protection of existing devices is generally unable to adapt to the dynamic changes of the press-fitting process. Therefore, we have designed a gear pump sleeve press-fitting device that can change the overload protection threshold as the press-fitting process progresses. Summary of the Invention

[0003] The invention provides a gear pump shaft sleeve press-fitting device for solving the defects in the prior art.

[0004] The present invention is achieved through the following technical solutions: The gear is mounted on the drive means and the drive means is mounted on the drive means, wherein the drive means is mounted on the drive means and the gear is mounted on the drive means.

[0005] As described above, a gear pump shaft sleeve pressing device, the limiting mechanism includes a nut, the nut is fixedly mounted on the top plate through a support rod, the thread on the nut cooperates with the installation screw, the threaded rod is provided with a slide groove, and one end of the screw is slidably installed in the slide groove.

[0006] In the gear pump shaft sleeve press-fitting device as described above, the gears are provided on the left and right sides and mesh with each other, and two corresponding racks are also provided.

[0007] As described above, a gear pump sleeve pressing device is characterized in that a support ring is fixedly installed on the top plate, a rotating ring is rotatably installed in the support ring through a one-way bearing, an annular tooth groove is provided on the rotating ring, an L-shaped groove is provided on the shift rod, an L-shaped rod is slidably installed in the L-shaped groove, one end of the L-shaped rod is provided with a tooth block engaged with the tooth groove, and the L-shaped rod is connected to the inner wall of the L-shaped groove through a second spring.

[0008] In the gear pump shaft sleeve press-fitting device as described above, hand wheels are fixedly mounted on the screw and the threaded rod respectively.

[0009] In the gear pump shaft sleeve press-fitting device as described above, when the shifting rod is in the original position, only one tooth of the rack is engaged with the gear.

[0010] The advantages of the present invention are: the present invention has a simple structure and an ingenious design. When the lever is pushed in the positive direction, the box body and the nut are driven to rotate synchronously. At this time, the threaded rod is restricted by the limiting mechanism and cannot rotate, forcing the threaded rod to move axially along the nut, thereby pushing the slide plate to compress the spring rod. As the compression stroke increases, the force required for the spring rod to disengage from the ball groove continues to increase, thereby achieving a dynamic increase in the overload protection threshold, improving the press-fitting reliability and operating efficiency, being able to meet actual needs, and being suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0012] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 yes Figure 1 A-direction view in; Figure 3 yes Figure 1 Right view in .

[0013] Figure numerals: 1. bottom plate, 2. placement groove, 3. movable plate, 4. first spring, 5. gear, 6. rack, 7. insertion rod, 8. box body, 9. lever, 10. slide plate, 11. spring rod, 12. threaded rod, 13. nut, 14. ball groove, 15. pressure head, 16. top plate, 17. connecting rod, 18. jack, 20. nut, 21. screw, 22. slide groove, 40. rotating ring, 41. tooth groove, 42. L-shaped groove, 43. L-shaped rod, 44. second spring, 45. support ring, 50. handwheel. DETAILED DESCRIPTION

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0015] A gear pump shaft sleeve press-fitting device, such as Figure 1 、 Figure 2 、 Figure 3As shown, including the bottom plate 1 and top plate 16, bottom plate 1 and top plate 16 are fixedly connected by a plurality of connecting rods 17, bottom plate 1 is set up for placing the gear pump body placing slot 2, connecting rod 17 is slidably mounted with the same movable plate 3 that can move up and down, a plurality of slide holes are set up on the movable plate 3, the inner wall of the slide hole is in sliding contact with the outer periphery of the corresponding connecting rod 17, the movable plate 3 is fixedly installed on the pressure head 15, the movable plate 3 and the bottom plate 1 are elastically connected by a plurality of first springs 4, the first spring 4 is sleeved on the connecting rod 17, one end of the first spring 4 is fixedly connected with the bottom plate 1, the other end of the first spring 4 is fixedly connected with the movable plate 3, the top plate 16 is rotatably installed with a gear 5, the shaft of the gear 5 is installed with a coaxial bearing with seat, the bearing with seat is fixedly installed on the top plate 16, one side of the gear 5 is engaged with a rack 6, both sides of the top plate 16 are provided with insertion holes 18, and an insertion rod 7 is slidably installed, the insertion rod 7 is fixedly installed on the movable plate 3, the rack 6 is fixedly installed on the insertion rod 7, one side of the gear 5 is rotatably installed with a box body 8 through a bearing, the box body 8 is coaxially arranged with the gear 5, the box body 8 is fixedly installed with a push rod 9, the box body 8 is slidably installed with a sliding plate 10, a plurality of spring rods 11 are fixedly installed on the sliding plate 10, the spring rods 11 are uniformly distributed in the circumferential direction about the center of the sliding plate 10, the fixed end of the spring rod 11 is fixedly connected with the sliding plate 10, one end of the spring rod 11 is spherical, and extends to the outside of the box body 8, a plurality of ball grooves 14 are formed on the gear 5, the ball grooves 14 are also uniformly distributed in the circumferential direction, and the number of the ball grooves 14 is the same as that of the spring rods 11, one end of the spring rod 11 is inserted and matched with the corresponding ball groove 14, a threaded rod 12 is rotatably installed on the sliding plate 10 through a bearing, a nut 13 is threadedly and matched installed on the threaded rod 12, the nut 13 is fixedly installed on the box body 8, the outer periphery of the nut 13 is fixedly connected with the inner wall of the reserved hole of the box body 8, the threaded rod 12, the nut 13 and the sliding plate 10 are coaxially arranged, and a limiting mechanism is arranged on the top plate 16 to limit the rotation of the threaded rod 12. The present application has the advantages of simple structure and ingenious design. When the push rod 9 is pushed forward, the box body 8 and the nut 13 are driven to rotate synchronously. At this time, the threaded rod 12 cannot rotate due to the limitation of the limiting mechanism, so that the threaded rod 12 moves axially along the nut 13, thereby pushing the sliding plate 10 to compress the spring rod 11. As the compression stroke increases, the force required for the spring rod 11 to escape from the ball groove 14 continues to increase, thereby realizing dynamic improvement of the overload protection threshold, improving the compression reliability and operation efficiency, meeting the actual demand, and being suitable for promotion.When using this device, place the pump body of the gear pump in the placement groove 2, and place the shaft sleeve accurately and vertically into the shaft sleeve hole entrance of the pump body, then push the lever 9 forward, the lever 9 drives the box body 8 to rotate, and the box body 8 drives the gear 5 to rotate through the spring rod 11 inserted into the ball groove 14, and the gear 5 drives the rack 6 to move downward, and drives the movable plate 3 and the pressure head 15 to slide axially along the connecting rod 17, the first spring 4 is compressed, and the pressure head 15 contacts the end face of the shaft sleeve and starts to press in at a lower speed and pressure, and the shaft sleeve begins to enter the hole. If the force of pushing the lever 9 is too great, the spring rod 11 will overcome the resistance of the ball groove 14 and shorten at the same time, and then disengage from the ball groove 14, and it will not be able to continue to drive the gear 5 to rotate, avoiding excessive pressure when the shaft sleeve is initially pressed in. If the pressure is normal, the lever 9 will continue to drive the box body 8, gear 5, and nut 13 to rotate, and the shaft sleeve will be pressed into a certain depth of the shaft sleeve hole on the pump body. The nut 13 rotates forward, driving the threaded rod 12 to move into the box body 8, and driving the slide plate 10 to move, thereby compressing the spring rod 11. The force required for the spring rod 11 to disengage from the ball groove 14 increases, and the pressure overload protection threshold increases. The greater the angle of the lever 9, the more the nut 13 rotates, and the more the spring rod 11 is compressed, and the pressure overload protection threshold increases. After the sleeve is pressed into a certain depth, the press-fitting speed can be appropriately increased until the sleeve is pressed into a predetermined depth position. When the sleeve approaches or reaches the final position, the pressure is briefly maintained to ensure that the sleeve is fully in place and stable. If the pressure is too large during the process and exceeds the overload protection threshold, the spring rod 11 will disengage from the ball groove 14 to ensure that the pressure throughout the press-fitting process is not too large; after the sleeve is pressed into place, the lever 9 is toggled in the opposite direction, which can drive the gear 5 to reset, and then drive the meshing rack 6 to move. At the same time, the movable plate 3 will move upward and reset under the action of the first spring 4 and the drive of the rack 6.

[0016] Specifically, if Figure 2 and Figure 3As shown, the limiting mechanism described in this embodiment includes a nut 20, which is fixedly installed on the top plate 16 through a support rod. The thread on the nut 20 is matched with the installation screw 21, and a slide groove 22 is provided on the threaded rod 12. One end of the screw 21 is slidably installed in the slide groove 22. By turning the screw 21 to make it move on the nut 20, when the screw 21 is separated from the slide groove 22, the screw 21 no longer prevents the threaded rod 12 from rotating, so that the threaded rod 12 can be turned to adjust the degree of compression of the spring rod 11 to change the initial overload protection threshold; when it is necessary to limit the rotation of the threaded rod 12, the screw 21 is turned so that one end of it enters the slide groove 22, and the threaded rod 12 cannot rotate under the restriction of the screw 21. When the box body 8 drives the nut 13 to rotate, the threaded rod 12 moves along the axis of the nut 13, thereby driving the slide plate 10 to move, changing the degree of compression of the spring rod 11, thereby achieving the change of the force required to separate the spring rod 11 from the ball groove 14 as the lever 9 drives the box body 8 and the gear 5 to rotate, thereby changing the overload protection threshold.

[0017] Specifically, such as Figure 1 As shown, the gears 5 of this embodiment are provided on the left and right sides and mesh with each other. The two gears 5 are symmetrically distributed on the left and right sides, and two corresponding racks 6 are also provided. The racks 6 correspond to the gears 5 one by one and are fixedly mounted on the corresponding insertion rods 7. The provision of the two gears 5 on the left and right sides can more evenly transmit the thrust to the movable plate 3, thereby generating a more stable and uniform pressure when the shaft sleeve is press-fitted, and avoiding the tilting of the movable plate 3 due to the force applied on only one side, which leads to uneven force applied when the shaft sleeve is press-fitted.

[0018] Further, such as Figure 2As shown, in this embodiment, a support ring 45 is fixedly installed on the top plate 16, one side of the support ring 45 is fixedly connected to the support plate, and the support plate is fixedly installed on the top plate 16. A rotating ring 40 is rotatably installed in the support ring 45 through a one-way bearing. An annular tooth groove 41 is provided on the rotating ring 40, and an L-shaped groove 42 is provided on the shift rod 9. Both ends of the L-shaped groove 42 are connected to the outside. An L-shaped rod 43 is slidably installed in the L-shaped groove 42, and one end of the L-shaped rod 43 is provided with a tooth block meshing with the tooth groove 41. The L-shaped rod 43 is connected to the inner wall of the L-shaped groove 42 through a second spring 44. One end of the second spring 44 is fixedly connected to the L-shaped rod 43, and the other end of the second spring 44 is fixedly connected to the inner wall of the L-shaped groove 42. When the lever 9 is toggled forward to move the movable plate 3 downward to press the shaft sleeve, the lever 9 drives the L-shaped rod 43 thereon to rotate together. Since one end of the L-shaped rod 43 is in meshing state with the tooth groove 41, the rotating ring 40 is also driven to rotate forward. Since the rotating ring 40 is rotatably mounted on the support ring 45 through the one-way bearing, the rotating ring 40 cannot be rotated in the reverse direction to reset after rotation, and the L-shaped rod 43 and the lever 9 cannot be rotated in the reverse direction to reset. As a result, the movable plate 3 cannot move upward after moving downward, so that the pressure on the shaft sleeve can always be maintained during the press-fitting process of the shaft sleeve; when it is necessary to toggle the lever 9 in the reverse direction, press the L-shaped rod 43, the second spring 44 is compressed until the L-shaped rod 43 is separated from the tooth groove 41, and the lever 9 can be toggled in the reverse direction to drive the box body 8 and the gear 5 to reset. When the L-shaped rod 43 is released, the L-shaped rod 43 is reset under the action of the second spring 44 and re-engages with the tooth groove 41.

[0019] Furthermore, Figure 1 and Figure 3 As shown, in this embodiment, a hand wheel 50 is fixedly mounted on the screw rod 21 and the threaded rod 12. Rotating the screw rod 21 or the threaded rod 12 by the hand wheel 50 is more convenient and labor-saving.

[0020] Furthermore, Figure 1 As shown, when the lever 9 of this embodiment is in its original position, only one tooth of the rack 6 is engaged with the gear 5. When the lever 9 is reversely moved to rotate the gear 5 and reset, if the lever 9 is further moved, since only one tooth of the rack 6 is engaged with the gear 5, the lever 9 rotates in the reverse direction, causing the gear 5 to rotate in the reverse direction. This causes the only tooth of the rack 6 to separate from the gear 5, preventing the rack 6 from continuing to move. This prevents the lever 9 from being reversed and causing the movable plate 3 to move upward excessively.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A gear pump shaft sleeve press-fitting device, comprising a bottom plate (1) and a top plate (16), the bottom plate (1) and the top plate (16) being fixedly connected by a plurality of connecting rods (17), a placement groove (2) for placing a gear pump body being provided on the bottom plate (1), a movable plate (3) capable of moving up and down being slidably mounted on the connecting rod (17), a pressure head (15) being fixedly mounted on the movable plate (3), the movable plate (3) and the bottom plate (1) being elastically connected by a plurality of first springs (4), characterized in that: A gear (5) is rotatably mounted on the top plate (16), a rack (6) is provided on one side of the gear (5), and a socket (18) is provided on both sides of the top plate (16), and a plug rod (7) is slidably mounted. The plug rod (7) is fixedly mounted on the movable plate (3), and the rack (6) is fixedly mounted on the plug rod (7). One side of the gear (5) is rotatably mounted on the box body (8) through a bearing, and a lever (9) is fixedly mounted on the box body (8). A slide plate (10) is slidably mounted in the box body (8), and a slide plate (10) is fixed on the slide plate (10). Several spring rods (11) are installed, one end of the spring rod (11) is spherical and extends to the outside of the box body (8), a plurality of ball grooves (14) are opened on the gear (5), one end of the spring rod (11) is plugged into the corresponding ball groove (14), the slide plate (10) is rotatably installed with a threaded rod (12) through a bearing, the threaded rod (12) is threadedly installed with a nut (13), the nut (13) is fixedly installed on the box body (8), and a limit mechanism for limiting the rotation of the threaded rod (12) is provided on the top plate (16).

2. A gear pump shaft sleeve press-fitting device according to claim 1, characterized in that: The limiting mechanism includes a nut (20), which is fixedly mounted on the top plate (16) through a support rod, a thread on the nut (20) is matched with a screw rod (21), a sliding groove (22) is provided on the threaded rod (12), and one end of the screw rod (21) is slidably mounted in the sliding groove (22).

3. The gear pump shaft sleeve press-fitting device according to claim 1, characterized in that: The gears (5) are provided with two on the left and right sides and mesh with each other, and two corresponding racks (6) are also provided.

4. The gear pump shaft sleeve press-fitting device according to claim 1, characterized in that: A support ring (45) is fixedly mounted on the top plate (16), a rotating ring (40) is rotatably mounted in the support ring (45) via a one-way bearing, an annular tooth groove (41) is provided on the rotating ring (40), an L-shaped groove (42) is provided on the shifting rod (9), an L-shaped rod (43) is slidably mounted in the L-shaped groove (42), one end of the L-shaped rod (43) is provided with a tooth block meshing with the tooth groove (41), and the L-shaped rod (43) is connected to the inner wall of the L-shaped groove (42) via a second spring (44).

5. The gear pump shaft sleeve press-fitting device according to claim 2, characterized in that: A hand wheel (50) is fixedly mounted on the screw rod (21) and the threaded rod (12), respectively.

6. The gear pump shaft sleeve press-fitting device according to claim 3, characterized in that: When the shifting rod (9) is in the original position, only one tooth of the rack (6) is engaged with the gear (5).

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