Wheelchair bushing inner double bearing press fitting device

Abstract

The present application relates to wheelchair assembly technical field, specifically is a kind of wheelchair spacer sleeve inner double bearing press fitting device, including mounting bracket, the bottom of mounting bracket is provided with positioning taper column, press fitting seat is slidably installed on mounting bracket, the axis of press fitting seat is on the same straight line with the axis of positioning taper column, the top of mounting bracket is provided with linear driver;Press fitting seat includes shell, the bottom of shell is slidably installed with several inner struts towards the side of positioning taper column, driving unit is arranged in shell, driving unit drives the synchronous movement of inner struts along the radial direction of press fitting seat, shell is supported to the bearing inner ring placed in the bottom of press fitting seat;The working end of linear driver is fixedly installed with lower pressing frame, the present technical solution is that several inner struts are synchronously moved along the radial direction of press fitting seat, the fixation of different size bearings is realized, when resetting, lower pressing frame can drive driving unit to make inner struts automatically release the support to bearing, the automatic operation of bearing fixation and release fixation is realized.

Description

Technical Field

[0001] This invention relates to the field of wheelchair assembly technology, specifically to a double bearing press-fitting device for wheelchair spacers. Background Technology

[0002] The wheelchair's front fork has spacers, and a bearing needs to be pressed into both ends of the spacer. Usually, the bearings are pressed into the spacers after the front fork, spacers, and wheelchair frame are welded together. However, the front fork extends at an angle, and the upper and lower surfaces of the wheelchair frame with the front fork fixed to it are not horizontal. It is difficult to place the wheelchair frame on a platform and then press the bearings into the spacers using a press. The bearings need to be hammered into the spacers one by one with a small hammer. Pressing the bearings into the spacers at both ends of the spacers is very troublesome.

[0003] Chinese patent CN218533446U discloses a double bearing press-fitting device for a wheelchair spacer, including a positioning assembly, a first handpiece, and a second handpiece. The positioning assembly includes a fixed shaft and a hollow movable sleeve. One end of the fixed shaft is used to link with the first handpiece. The fixed shaft has a first limiting part extending outward at a position offset from the first positioning structure. A pressure block is sleeved on the fixed shaft. The pressure block includes a second limiting part extending outward. The second limiting part has a positioning protrusion in the middle. The pressure block has a clearance hole that passes through the second limiting part and the positioning protrusion. The movable sleeve is threaded to the other end of the fixed shaft and is used to link with the second handpiece.

[0004] This equipment can press-fit bearings directly without considering the placement of the spacer. However, it cannot fix bearings and bushings of different sizes. After fixing the bearing, it is necessary to release the bearing after pressing it into the bushing. Existing technology cannot quickly and easily separate the bearing and the pressure block. Summary of the Invention

[0005] To address the aforementioned issues, it is necessary to provide a double-bearing press-fitting device for wheelchair spacers, addressing the problems inherent in existing technologies.

[0006] To solve the problems of the prior art, the technical solution adopted by the present invention is as follows:

[0007] A double-bearing press-fitting device for a wheelchair spacer includes a mounting frame with a handle and a press-fitting seat. A positioning cone with a gradually tapering angle is located at the bottom of the mounting frame. The press-fitting seat is slidably mounted on the mounting frame, with its axis aligned with the axis of the positioning cone. A linear actuator for driving the press-fitting seat to move along the axis is located at the top of the mounting frame. The press-fitting seat includes a housing with several inner support blocks slidably mounted on the bottom of the housing facing the positioning cone. A drive unit is located inside the housing, driving the inner support blocks to move synchronously along the radial direction of the press-fitting seat. The housing provides internal support for the inner ring of the bearing placed at the bottom of the press-fitting seat. A lower press frame is fixedly mounted on the working end of the linear actuator. When the lower press frame moves downward, it causes the press-fitting seat to move downward. When the lower press frame resets, it drives the drive unit to move the inner support blocks towards the axis of the press-fitting seat, releasing the support for the bearing.

[0008] Preferably, each inner support block is provided with a guide rod extending along the axis of the shell. The bottom of the shell is provided with the same number of first limiting holes as the inner support blocks. The first limiting holes are evenly distributed around the axis of the shell. The width of the first limiting holes is the same as the diameter of the guide rod. The first limiting holes extend radially along the shell. The guide rod is inserted into the first limiting hole and extends into the shell. A turntable is rotatably installed inside the shell. The axis of the turntable is on the same straight line as the axis of the shell. The turntable is provided with the same number of second limiting holes as the first limiting holes. The second limiting holes are evenly distributed around the axis of the turntable. The second limiting holes are inclined. The guide rod is inserted into the second limiting hole. The rotation of the turntable drives the inner support blocks to move synchronously along the first limiting holes.

[0009] Preferably, a shaft cylinder is coaxially arranged on the upper side of the turntable, and a spirally extending oblique slot is arranged around the circumference of the shaft cylinder; the inner cylinder and the lower pressure column are coaxially arranged in the drive unit, the lower pressure column is located inside the inner cylinder, the bottom of the lower pressure column is inserted into the shaft cylinder, and the bottom of the lower pressure column is provided with the same number of insertion rods as the oblique slots and extending radially along the lower pressure column. The insertion rods are inserted into the oblique slots. When the inner cylinder drives the lower pressure column to move downward, the insertion rods move along the oblique slots and drive the shaft cylinder and the turntable to rotate.

[0010] Preferably, the outer wall of the inner cylinder is provided with an inner support ring, which fits against the inner wall of the shell. The inner support ring is provided with a plurality of extension rods extending radially along the inner cylinder. The extension rods pass through a first limiting groove provided on the shell and extend to the outside of the shell. The first limiting groove extends along the axial direction of the shell. A plurality of guide rods extending vertically upward are provided around the lower pressure column. The guide rods are inserted into the guide holes at the top of the inner cylinder.

[0011] Preferably, the top of the pressing column is elastically connected to one end of the first spring, and the other end of the first spring is elastically connected to the top of the housing. The spring force of the first spring causes the pressing column to move upward and drive the turntable to rotate until all the inner support blocks are in contact. A positioning rod that moves along the axis of the extension rod is slidably installed inside the extension rod of the inner cylinder. A positioning hole with the same diameter as the positioning rod is provided on the guide rod, which is located on the lifting path of the positioning rod. When the positioning rod is inserted into the positioning hole, the pressing column moves synchronously with the inner cylinder.

[0012] Preferably, the positioning rod has a pull rod at one end outside the housing, and the pull rod extends horizontally perpendicular to the axis of the positioning rod; the lower pressure frame includes a lower pressure block for pressing the top of the housing, and the lower pressure frame has several vertically extending side support legs on its periphery. The two ends of the side support legs are hinged to a lever block, the hinge axis of the lever block is parallel to the axis of the pull rod, and the side support leg has a horizontal limiting plate at the bottom of the lever block. The limiting plate cooperates with the lever block so that the lever block can only flip upward when it moves down to contact the pull rod; the upper side of the lever block has an inclined surface, and when the inclined surface contacts the bottom of the pull rod from bottom to top, it drives the pull rod to move along its own axis and disengage from the first spring.

[0013] Preferably, the top end of the lever extends horizontally to the side of the pull rod away from the housing axis; the top end of the limiting plate is located on the side of the pull rod close to the housing axis.

[0014] Preferably, the extension rod has a coaxial shaft hole with the same inner diameter as the positioning rod. The positioning rod is inserted into the shaft hole. A mounting hole is coaxially provided on the shaft hole with an inner diameter larger than that of the shaft hole. A side ring is coaxially provided on the positioning rod with the same outer diameter as that of the mounting hole. A second spring is provided in the mounting hole, which elastically connects the mounting hole and the side ring. The spring force of the second spring causes the positioning rod to move towards the axis of the housing.

[0015] Preferably, a damping block is slidably installed in the first limiting groove, and the extension rod is inserted into the damping block.

[0016] Preferably, the top periphery of the housing is provided with the same number of protrusions as the side support legs, and the side support legs are provided with a second limiting groove extending in the vertical direction. The protrusions move within the second limiting groove. When the lower pressure frame moves up to the bottom of the second limiting groove and fits against the bottom end of the protrusion, the pressing seat moves up synchronously with the lower pressure frame.

[0017] The advantages of this invention compared to the prior art are:

[0018] Firstly, the several inner support blocks inside the press-fitting base in this invention can be moved synchronously along the radial direction of the press-fitting base by the drive unit. This allows it to adapt to bearing inner rings of different sizes and fix bearings of different sizes. In conjunction with the positioning cone at the bottom of the mounting frame, the spacer is positioned, ensuring the positional accuracy of the bearing during press-fitting. Unlike in the past, there is no need to consider the complex placement of the spacer and wheelchair frame, simplifying the operation process.

[0019] Secondly, the present invention, through the presence of the inner cylinder and the lower pressure column, in conjunction with the guide rod on the inner support block, the first limiting hole on the shell, and the second limiting hole inclinedly set on the turntable, realizes that the rotation of the turntable is driven by the lifting of the inner cylinder and the positioning column, thereby making the inner support block move synchronously. This ensures that the movement of each inner support block is synchronous and uniform, thus ensuring that the center position of the bearing on the press-fitting seat is consistent with the center position of the positioning cone column, thereby improving the accuracy and quality of bearing press-fitting.

[0020] Thirdly, the present invention drives the press base to move along the axis by a linear actuator, and when the lower press frame is reset, it can drive the drive unit to automatically release the inner support block from the bearing, realizing the automated operation of fixing and unfixing the bearing. This avoids the cumbersome process of manually unfixing the bearing after fixing it in the prior art, and realizes the separation of the bearing from the press base quickly and conveniently, greatly improving work efficiency. Attached Figure Description

[0021] Figure 1 A three-dimensional double-bearing press-fitting device for wheelchair spacers in non-working state. Figure 1 ;

[0022] Figure 2 A three-dimensional double-bearing press-fitting device for wheelchair spacers in non-working state. Figure 2

[0023] Figure 3 This is a front view of a double-bearing press-fitting device inside a wheelchair spacer in its first working state.

[0024] Figure 4 yes Figure 3 Sectional view of section AA;

[0025] Figure 5 yes Figure 4 A magnified view of section B;

[0026] Figure 6 This is an exploded three-dimensional structural diagram of a double-bearing press-fitting device inside a wheelchair partition.

[0027] Figure 7 yes Figure 6 A magnified view of a portion at point C;

[0028] Figure 8This is a front view of a double-bearing press-fitting device inside a wheelchair partition in its second working state.

[0029] Figure 9 yes Figure 8 Sectional view of the DD section;

[0030] Figure 10 yes Figure 9 A magnified view of a portion at point E.

[0031] The diagram is labeled as follows: 1. Mounting bracket; 11. Handle; 12. Positioning cone; 13. Linear actuator; 14. Lower pressure bracket; 141. Lower pressure block; 142. Side support; 143. Pulley; 144. Limiting plate; 145. Inclined surface; 146. Second limiting groove; 2. Press-fit base; 21. Housing; 211. First limiting hole; 212. Turntable; 213. Second limiting hole; 214. Shaft cylinder; 215. Angled slot; 2 16. First limiting groove; 217. Damping block; 218. Protrusion; 22. Inner support block; 221. Guide rod; 23. Inner cylinder; 231. Inner support ring; 232. Extension rod; 233. Positioning rod; 234. Pull rod; 235. Shaft hole; 236. Mounting hole; 237. Side ring; 238. Second spring; 24. Downward pressure column; 241. Insert rod; 242. Guide rod; 243. First spring; 244. Positioning hole. Detailed Implementation

[0032] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0033] Reference Figures 1 to 10 :

[0034] A double-bearing press-fitting device for a wheelchair partition includes a mounting frame 1, on which a handle 11 and a press-fitting seat 2 are mounted. A positioning cone 12 with a gradually tapering upward is provided at the bottom of the mounting frame 1. The press-fitting seat 2 is slidably mounted on the mounting frame 1, with its axis aligned with the axis of the positioning cone 12. A linear actuator 13 for driving the press-fitting seat 2 to move along its axis is provided at the top of the mounting frame 1. The press-fitting seat 2 includes a housing 21, with the bottom of the housing 21 facing... Several inner support blocks 22 are slidably installed on one side of the positioning cone column 12. A drive unit is provided inside the housing 21. The drive unit drives the inner support blocks 22 to move synchronously along the radial direction of the press base 2. The housing 21 provides inner support for the bearing inner ring placed at the bottom of the press base 2. A lower pressure frame 14 is fixedly installed on the working end of the linear actuator 13. When the lower pressure frame 14 moves down, it drives the press base 2 to move down. When the lower pressure frame 14 resets, it drives the drive unit to move the inner support blocks 22 toward the axis of the press base 2 to release the support for the bearing.

[0035] In use, the operator places the bearing to be press-fitted at the bottom of the press-fitting base 2. Since several inner support blocks 22 are slidably installed on the bottom of the housing 21 of the press-fitting base 2 facing the positioning cone 12, these inner support blocks 22 do not currently provide internal support for the bearing's inner ring. The operator can drive the inner support blocks 22 to move synchronously radially along the press-fitting base 2 via the drive unit, thereby providing internal support for the bearing's inner ring placed at the bottom of the press-fitting base 2, thus securing the bearing. The operator then moves the mounting bracket 1 and the press-fitting base 2 to one end of the wheelchair's spacer using the handle 11, allowing the positioning cone 12 to be inserted into the other end of the spacer for positioning. Because the positioning cone 12 has a tapered shape that gradually decreases upwards, it can accurately engage with the spacer for positioning. Subsequently, the linear actuator 13 is activated. The linear actuator 13 can be a cylinder or an electric push rod, etc. The lower pressing frame 14, fixedly mounted on the working end of the linear actuator 13, moves downwards, causing the press-fitting base 2 to move downwards until the bearing is pressed into the spacer. After the bearing is press-fitted, the working end of the linear actuator 13 drives the lower press frame 14 to reset and move upward. During the reset process, the lower press frame 14 drives the drive unit to move the inner support block 22 toward the axis of the press-fit seat 2, thereby releasing the support for the bearing. At this time, the press-fitting device can be removed from the spacer of the press-fitted bearing, completing one press-fitting operation. In this embodiment, the positioning cone 12 provided at the bottom of the mounting frame 1, with its gradually decreasing taper, can be accurately inserted into the spacer to position the spacer, ensuring the positional accuracy during bearing press-fitting. Unlike in the past, there is no need to consider the complex placement of the spacer and wheelchair frame, simplifying the operation process. Several inner support blocks 22 within the press-fit base 2 can be moved synchronously along the radial direction of the press-fit base 2 by the drive unit. This allows for the adaptation to bearing inner rings of different sizes, enabling the fixing of bearings of different sizes. The linear actuator 13 can drive the press-fit base 2 to move along the axis, and the lower press frame 14 can drive the drive unit to automatically release the inner support blocks 22 from supporting the bearing when resetting. This achieves automated operation of fixing and unfixing the bearing, avoiding the cumbersome process of manually unfixing the bearing after fixing in the prior art. It quickly and conveniently separates the bearing from the press-fit base 2, greatly improving work efficiency.

[0036] To ensure that the inner support block 22 can move synchronously, thereby guaranteeing that the axis of the fixed bearing is on the same straight line as the axis of the positioning cone column 12, the following features are specifically designed:

[0037] Each inner support block 22 is provided with a guide rod 221 extending along the axis of the housing 21. The bottom of the housing 21 is provided with the same number of first limiting holes 211 as the inner support blocks 22. The first limiting holes 211 are distributed at equal angles around the axis of the housing 21. The width of the first limiting holes 211 is the same as the diameter of the guide rod 221. The first limiting holes 211 extend radially along the housing 21. The guide rod 221 is inserted into the first limiting holes 211 and extends into the housing 21. A turntable 212 is rotatably installed inside the housing 21. The axis of the turntable 212 is on the same straight line as the axis of the housing 21. The turntable 212 is provided with the same number of second limiting holes 213 as the first limiting holes 211. The second limiting holes 213 are distributed at equal angles around the axis of the turntable 212. The second limiting holes 213 are inclined. The guide rod 221 is inserted into the second limiting holes 213. The rotation of the turntable 212 drives the inner support blocks 22 to move synchronously along the first limiting holes 211.

[0038] Before use, in this embodiment, the inner support blocks 22 are in their initial position without supporting the inner ring of the bearing, and the turntable 212 is in its initial position. The spacing between the inner support blocks 22 is small, which facilitates placing the bearing at the bottom of the press-fit seat 2. When the turntable 212 starts to rotate, since the guide rod 221 is inserted into the first limiting hole 211 and the second limiting hole 213, and the second limiting hole 213 is inclined, during the rotation of the turntable 212, the guide rod 221 inserted into the second limiting hole 213 will be subjected to the component force of the inclined direction of the second limiting hole 213, thereby causing the guide rod 221 to move along the length direction of the first limiting hole 211. Because each inner support block 22 is connected to the turntable 212 through the guide rod 221, and the first limiting holes 211 are distributed at equal angles around the axis of the housing 21, when the turntable 212 rotates, each inner support block 22 will move synchronously along the first limiting hole 211 in a direction away from the axis until the inner support block 22 contacts the inner ring of the bearing and supports and fixes it. In this embodiment, by setting guide rod 221, first limiting hole 211 and inclined second limiting hole 213, the rotation of turntable 212 drives the inner support block 22 to move synchronously. This ensures that the movement of each inner support block 22 is synchronous and uniform, thereby ensuring that the center position of the bearing on the press-fit seat 2 is consistent with the center position of the positioning cone 12. This improves the accuracy and quality of bearing press-fitting and avoids press-fitting problems caused by the misalignment of the bearing axis and the spacer axis.

[0039] To solve the problem of how to drive the turntable 212 to rotate, the following features were specifically designed:

[0040] A shaft cylinder 214 is coaxially arranged on the upper side of the turntable 212, and a spirally extending oblique slot 215 is arranged around the circumference of the shaft cylinder 214. An inner cylinder 23 and a lower pressure column 24 are coaxially arranged in the drive unit. The lower pressure column 24 is located inside the inner cylinder 23, and the bottom of the lower pressure column 24 is inserted into the shaft cylinder 214. The bottom of the lower pressure column 24 is provided with the same number of insertion rods 241 as the oblique slots 215 and extending radially along the lower pressure column 24. The insertion rods 241 are inserted into the oblique slots 215. When the inner cylinder 23 drives the lower pressure column 24 to move downward, the insertion rods 241 move along the oblique slots 215 and drive the shaft cylinder 214 and the turntable 212 to rotate.

[0041] In this embodiment, as the inner cylinder 23 of the drive unit moves downward, it drives the pressing column 24 located inside it to move downward as well. Since the insertion rod 241 is inserted into the inclined slot 215, when the pressing column 24 moves downward with the inner cylinder 23, the insertion rod 241 will move along the spiral trajectory of the inclined slot 215. This movement will generate a force that causes the shaft cylinder 214 to rotate. Because the shaft cylinder 214 is coaxially set with the turntable 212, the rotation of the shaft cylinder 214 will drive the turntable 212 to rotate synchronously. Similarly, when the inner cylinder 23 moves upward, the inner cylinder 23 drives the pressing column 24 to move upward. At this time, the insertion rod 241 moves in the opposite direction along the inclined slot 215, causing the shaft cylinder 214 and the turntable 212 to rotate in the opposite direction, so that the inner support block 22 moves synchronously towards the axis of the press seat 2, releasing the support for the bearing.

[0042] To ensure that the inner cylinder 23 and the lower pressure column 24 do not rotate around their axis during lifting and lowering, thus ensuring that the turntable 212 is rotated, the following features are specifically designed:

[0043] An inner support ring 231 is provided on the outer wall of the inner cylinder 23. The inner support ring 231 fits against the inner wall of the shell 21. Several extension rods 232 extending radially along the inner cylinder 23 are provided on the inner support ring 231. The extension rods 232 pass through the first limiting groove 216 provided on the shell 21 and extend to the outside of the shell 21. The first limiting groove 216 extends along the axial direction of the shell 21. Several guide rods 242 extending vertically upward are provided around the lower pressure column 24. The guide rods 242 are inserted into the guide holes at the top of the inner cylinder 23.

[0044] In this embodiment, when the inner cylinder 23 of the drive unit moves, the extension rod 232 on the inner support ring 231 is inserted into the first limiting groove 216 extending along the axis of the housing 21. The extension rod 232 can only move within the first limiting groove 216 along the axis of the housing 21, thus restricting the rotation of the inner cylinder 23 around its own axis and causing it to only move linearly downwards along the axis. Simultaneously, the downward movement of the inner cylinder 23 causes the pressing column 24 to move downwards. The guide rod 242 on the periphery of the pressing column 24 moves synchronously downwards in the guide hole at the top of the inner cylinder 23. Again, due to the restriction of the guide rod 242, the pressing column 24 can only move linearly downwards along the axis and will not rotate around the axis. When the pressing column 24 moves downwards, its bottom insertion rod 241 moves along the inclined slot 215 on the shaft cylinder 214, thereby causing the shaft cylinder 214 and the turntable 212 to rotate, which in turn causes the inner support block 22 to move accordingly.

[0045] To achieve synchronous movement between the lower pressure column 24 and the inner cylinder 23, and to allow the lower pressure column 24 to move upward quickly under the influence of the lower pressure frame 14 to release the fixing effect of the inner support block 22 on the bearing, the following features are specifically designed:

[0046] The top of the pressing column 24 is elastically connected to one end of the first spring 243, and the other end of the first spring 243 is elastically connected to the top of the housing 21. The elastic force of the first spring 243 causes the pressing column 24 to move upward and drive the turntable 212 to rotate until the inner support blocks 22 are all in contact. A positioning rod 233 that moves along the axis of the extension rod 232 is slidably installed inside the extension rod 232 of the inner cylinder 23. A positioning hole 244 with the same diameter as the positioning rod 233 is provided on the guide rod 242, which is located on the lifting path of the positioning rod 233. When the positioning rod 233 is inserted into the positioning hole 244, the pressing column 24 moves synchronously with the inner cylinder 23.

[0047] In this embodiment, the top of the pressing column 24 is elastically connected to the top of the housing 21 via a first spring 243. Due to the elastic force of the first spring 243, the pressing column 24 moves upward, causing all the inner support blocks 22 to fit together, at which point it is in the initial position where the bearing can be placed. The positioning rod 233 inside the extension rod 232 of the inner cylinder 23 is not inserted into the positioning hole 244 of the guide rod 242, and the pressing column 24 and the inner cylinder 23 are not synchronously connected. When the operator fixes the bearing, they can move the inner cylinder 23 upward, causing the positioning rod 233 inside the extension rod 232 to gradually approach the positioning hole 244 on the guide rod 242 until the positioning rod 233 is inserted into the positioning hole 244, connecting the pressing column 24 and the inner cylinder 23 together. Then, by pushing the inner cylinder 23 downward, the pressing column 24 moves downward synchronously with the inner cylinder 23. The insertion rod 241 at the bottom of the lower pressure column 24 moves along the inclined slot 215 on the shaft cylinder 214, causing the shaft cylinder 214 and the turntable 212 to rotate, so that the inner support block 22 moves radially outward along the press seat 2, and tightens and fixes the bearing inner ring placed at the bottom of the press seat 2.

[0048] In order to achieve the purpose of releasing the locking of the positioning rod 233 on the lower pressure column 24 when the lower pressure frame 14 moves upward, so that the lower pressure column 24 can move upward under the elastic force of the first spring 243, the following features are specifically provided:

[0049] A pull rod 234 is provided at one end of the positioning rod 233 located outside the housing 21. The pull rod 234 extends horizontally in a direction perpendicular to the axis of the positioning rod 233. The lower pressure frame 14 includes a lower pressure block 141 for pressing the top of the housing 21. Several vertically extending side support legs 142 are provided around the lower pressure frame 14. The two ends of the side support legs 142 are hinged to a lever 143. The hinge axis of the lever 143 is parallel to the axis of the pull rod 234. A horizontal limiting plate 144 is provided at the bottom of the lever 143 on the side support leg 142. The limiting plate 144 cooperates with the lever 143 so that the lever 143 can only flip upward when it moves down to contact the positioning rod 233. An inclined surface 145 is provided on the upper side of the lever 143. When the inclined surface 145 contacts the bottom of the pull rod 234 from bottom to top, it drives the pull rod 234 to move along its own axis and disengage from the first spring 243.

[0050] In this embodiment, when the operator is fixing the bearing, they can pull the pull rod 234 to move the inner cylinder 23 upward, so that the positioning rod 233 in the extension rod 232 gradually approaches the positioning hole 244 on the guide rod 242 until the positioning rod 233 is inserted into the positioning hole 244, and the lower pressure column 24 is connected to the inner cylinder 23. When the linear actuator 13 moves the lower pressure frame 14 downward, the lower pressure block 141 of the lower pressure frame 14 presses the bottom of the housing 21, so that the press seat 2 moves downward as a whole. During this process, the housing 21, as well as the connected inner cylinder 23 and lower pressure column 24, move downward with the housing 21. When the lower pressure block 141 is attached to the top of the housing 21, the side support leg 142 of the lower pressure frame 14 moves to below the pull rod 234. The lever 143 on the side support leg 142 automatically flips upward around the hinge axis when passing the pull rod 234 from top to bottom, so that it moves downward through the pull rod 234. After the bearing is press-fitted, the linear actuator 13 drives the lower pressure frame 14 to move upward. During the upward movement of the lower pressure frame 14, the side support leg 142 moves upward accordingly, and the lever 143 also rises. Because the limit plate 144 cooperates with the lever 143, the lever 143 maintains its initial state during the upward movement and will not flip arbitrarily. As the lower pressure frame 14 continues to move upward, when the lever 143 rises to contact the pull rod 234, the inclined surface 145 on the upper side of the lever 143 contacts the lower part of the pull rod 234 from bottom to top. As the lever 143 continues to rise, the inclined surface 145 generates a horizontal component force on the pull rod 234, causing the pull rod 234 to move along its own axis. Because the pull rod 234 is connected to the positioning rod 233, the positioning rod 233 also moves accordingly, thereby causing the positioning rod 233 to disengage from the positioning hole 244 of the guide rod 242 and release the lock on the lower pressure column 24. The lower pressure column 24 moves upward rapidly under the elastic force of the first spring 243. During the upward movement of the lower pressure column 24, the insertion rod 241 moves in the opposite direction along the inclined slot 215, causing the shaft cylinder 214 and the turntable 212 to rotate in the opposite direction, causing the inner support block 22 to move radially inward along the press-fit seat 2 until they are completely fitted together, thus releasing the fixing effect on the bearing. In this embodiment, by setting components such as the toggle block 143, the inclined surface 145, the pull rod 234, and the limiting plate 144, the locking of the positioning rod 233 on the lower pressure column 24 is automatically released when the lower pressure frame 14 moves upward. The setting of the first spring 243 allows the lower pressure column 24 to move upward quickly under the action of the elastic force after the positioning rod 233 is pulled out of the positioning hole 244. This rapid upward movement characteristic can quickly drive the turntable 212 to rotate in the opposite direction, thereby quickly releasing the fixing effect of the inner support block 22 on the bearing.

[0051] To ensure that the lever 143 can contact the pull rod 234 and that the limiting plate 144 will not contact the pull rod 234, the following features are specifically designed:

[0052] The top of the lever 143 extends horizontally to the side of the pull rod 234 away from the axis of the housing 21; the top of the limiting plate 144 is located on the side of the pull rod 234 close to the axis of the housing 21.

[0053] In this embodiment, the top end of the toggle block 143 extends horizontally to the side of the pull rod 234 away from the axis of the housing 21, ensuring that the toggle block 143 can accurately contact the pull rod 234 during the upward movement of the press-fit seat 2, and apply a horizontal component force to the pull rod 234 through the inclined surface 145, thereby reliably releasing the locking of the positioning rod 233 to the lower pressing column 24. The top end of the limiting plate 144 is located on the side of the pull rod 234 close to the axis of the housing 21, preventing the limiting plate 144 from contacting the pull rod 234 during the downward movement.

[0054] To ensure that the positioning rod 233 can automatically insert into the positioning hole 244 when it moves to the positioning hole 244 to complete the connection between the inner cylinder 23 and the lower pressure column 24, the following features are specifically designed:

[0055] An extension rod 232 has a coaxial shaft hole 235. The inner diameter of the shaft hole 235 is the same as the diameter of the positioning rod 233. The positioning rod 233 is inserted into the shaft hole 235. An mounting hole 236 is coaxially provided on the shaft hole 235. The inner diameter of the mounting hole 236 is larger than the inner diameter of the shaft hole 235. A side ring 237 is coaxially provided on the positioning rod 233. The outer diameter of the side ring 237 is the same as the inner diameter of the mounting hole 236. A second spring 238 is provided in the mounting hole 236. The second spring 238 elastically connects the mounting hole 236 and the side ring 237. The elastic force of the second spring 238 causes the positioning rod 233 to move in the direction of the axis of the housing 21.

[0056] In this embodiment, when the positioning hole 244 moves to a position coaxially aligned with the positioning rod 233, the positioning rod 233 moves towards the axis of the housing 21 under the action of the second spring 238 and inserts into the positioning hole 244. The pressing column 24 can move downward synchronously with the inner cylinder 23. After pressing is completed, the linear actuator 13 drives the pressing frame 14 to reset and move upward. The toggle block 143 on the pressing frame 14 contacts the pull rod 234, driving the positioning rod 233 to move along its own axis and compress the second spring 238, causing it to disengage from the positioning hole 244 and releasing the lock on the pressing column 24. At this time, the pressing column 24 moves upward rapidly under the action of the first spring 243. Subsequently, the positioning rod 233 again adheres to the surface of the guide rod 242 under the action of the second spring 238 until the positioning rod 233 follows the inner cylinder 23 again.

[0057] In order to ensure that the inner cylinder 23 can remain stable when moved to any position, thereby maintaining the stability of the inner support block 22's support for the bearing, the following features are specifically provided:

[0058] A damping block 217 is slidably installed in the first limiting groove 216, and an extension rod 232 is inserted into the damping block 217.

[0059] In this embodiment, the inner cylinder 23 is connected to the damping block 217 via an extension rod 232. The damping block 217 is located within the first limiting groove 216. As the inner cylinder 23 moves downward, the extension rod 232 pushes the damping block 217 to slide downward within the first limiting groove 216. Due to the presence of the damping block 217, it provides a damping force to the extension rod 232, preventing the inner cylinder 23 from swaying or suddenly accelerating during its downward movement. When pressed to a certain position, the damping block 217 continuously provides damping force to ensure the stability of the inner cylinder 23, thereby maintaining the stable support of the bearing by the inner support block 22.

[0060] In order to enable the lower pressure frame 14 to move the press-fit seat 2 upward after the inner support block 22 is released from fixing the bearing, the following features are specifically designed:

[0061] The top periphery of the housing 21 is provided with the same number of protrusions 218 as the side support legs 142. The side support legs 142 are provided with a second limiting groove 146 extending in the vertical direction. The protrusions 218 move within the second limiting groove 146. When the lower pressure frame 14 moves up to the bottom of the second limiting groove 146 and fits the bottom end of the protrusions 218, the pressing seat 2 moves up synchronously with the lower pressure frame 14.

[0062] In this embodiment, the second limiting groove 146 on the side support 142 of the lower pressure frame 14 corresponds to the protrusion 218 on the top periphery of the housing 21. When the linear actuator 13 drives the lower pressure frame 14 to move downward, the lower pressure block 141 of the lower pressure frame 14 presses against the bottom of the housing 21, causing the press-fit seat 2 to move downward as a whole. During this process, the protrusion 218 moves downward within the second limiting groove 146. During the upward movement of the lower pressure frame 14, the push block 143 first contacts the pull rod 234, driving the positioning rod 233 to move along its own axis, causing it to disengage from the positioning hole 244 of the guide rod 242. During this process, the protrusion 218 continues to move upward within the second limiting groove 146. When the lower pressure frame 14 continues to move upward until the bottom of the second limiting groove 146 is in contact with the bottom end of the protrusion 218, the lower pressure frame 14 and the press-fit seat 2 are connected through the cooperation of the protrusion 218 and the second limiting groove 146. Because of this connection, when the lower pressure frame 14 continues to move upward, it will drive the pressing seat 2 to move upward synchronously, removing the pressing seat 2 from the spacer of the already pressed bearing, thus completing the entire pressing process.

[0063] Working principle: The operator places the bearing to be press-fitted at the bottom of the press-fitting base 2. Since several inner support blocks 22 are slidably installed on the bottom of the housing 21 of the press-fitting base 2 facing the positioning cone 12, these inner support blocks 22 do not currently provide internal support for the bearing's inner ring. The operator can drive the inner support blocks 22 to move synchronously radially along the press-fitting base 2 via the drive unit, thereby providing internal support for the bearing's inner ring placed at the bottom of the press-fitting base 2, thus fixing the bearing. The operator then moves the mounting bracket 1 and the press-fitting base 2 to one end of the wheelchair's spacer using the handle 11, allowing the positioning cone 12 to be inserted into the other end of the spacer for positioning. Because the positioning cone 12 has a gradually decreasing taper, it can accurately engage with the spacer for positioning. Subsequently, the linear actuator 13 is activated. The linear actuator 13 can be a cylinder or an electric push rod, etc. The lower pressing frame 14, fixedly installed on the working end of the linear actuator 13, moves downward, causing the press-fitting base 2 to move downward until the bearing is pressed into the spacer. After the bearing is press-fitted, the working end of the linear actuator 13 drives the lower press frame 14 to reset and move upward. During the reset process, the lower press frame 14 drives the drive unit to move the inner support block 22 toward the axis of the press-fitting seat 2, thereby releasing the support of the bearing. At this time, the press-fitting device can be removed from the spacer of the press-fitted bearing to complete one press-fitting operation.

[0064] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A double-bearing press-fitting device for a wheelchair spacer, comprising a mounting frame, a handle and a press-fitting seat mounted on the mounting frame, characterized in that, The mounting frame has a positioning cone at the bottom, which has a tapered shape that gradually decreases upward. The pressing seat is slidably mounted on the mounting frame, and the axis of the pressing seat is on the same straight line as the axis of the positioning cone. The top of the mounting frame is provided with a linear actuator for driving the pressing seat to move along the axis. The press-fit base includes a housing. Several inner support blocks are slidably installed on the bottom of the housing facing the positioning cone. A drive unit is provided inside the housing. The drive unit drives the inner support blocks to move synchronously along the radial direction of the press-fit base. The housing provides inner support for the bearing inner ring placed at the bottom of the press-fit base. A lower pressure frame is fixedly installed on the working end of the linear actuator. When the lower pressure frame moves down, it drives the press seat to move down. When the lower pressure frame resets, it drives the drive unit to move the inner support block towards the axis of the press seat to release the support of the bearing. Each of the inner support blocks is provided with a guide rod extending along the axis of the shell. The bottom of the shell is provided with the same number of first limiting holes as the inner support blocks. The first limiting holes are distributed at equal angles around the axis of the shell. The width of the first limiting holes is the same as the diameter of the guide rod. The first limiting holes extend radially along the shell. The guide rod is inserted into the first limiting hole and extends into the interior of the shell. A turntable is rotatably installed inside the housing. The axis of the turntable is on the same straight line as the axis of the housing. The turntable is provided with the same number of second limiting holes as the first limiting holes. The second limiting holes are distributed at equal angles around the axis of the turntable and are inclined. The guide rod is inserted into the second limiting hole. The rotation of the turntable drives the inner support block to move synchronously along the first limiting hole. A shaft cylinder is coaxially arranged on the upper side of the turntable, and a spirally extending oblique slot is provided around the circumference of the shaft cylinder. The drive unit is coaxially arranged with an inner cylinder and a lower pressure column. The lower pressure column is located inside the inner cylinder, and its bottom is inserted into the shaft cylinder. The bottom of the lower pressure column is provided with a rod that is the same number as the inclined slots and extends radially along the lower pressure column. The rod is inserted into the inclined slots. When the inner cylinder drives the lower pressure column to move down, the rod moves along the inclined slots and drives the shaft cylinder and the turntable to rotate. The outer wall of the inner cylinder is provided with an inner support ring, which fits against the inner wall of the shell. The inner support ring is provided with a number of extension rods that extend radially along the inner cylinder. The extension rods pass through the first limiting groove provided on the shell and extend to the outside of the shell. The first limiting groove extends along the axial direction of the shell. Several vertically extending guide rods are provided around the lower pressure column, and the guide rods are inserted into the guide holes at the top of the inner cylinder; The top of the pressing column is elastically connected to one end of the first spring, and the other end of the first spring is elastically connected to the top of the housing. The elastic force of the first spring causes the pressing column to move upward and drive the turntable to rotate until all the inner support blocks are in contact with each other. A positioning rod that moves along the axis of the extension rod is slidably installed inside the extension rod of the inner cylinder. A positioning hole with the same diameter as the positioning rod is provided on the guide rod, which is located on the lifting path of the positioning rod. When the positioning rod is inserted into the positioning hole, the lower pressure column moves synchronously with the inner cylinder.

2. The double bearing press-fitting device for a wheelchair spacer according to claim 1, characterized in that, A pull rod is provided at one end of the positioning rod located outside the housing, and the pull rod extends in a horizontal direction perpendicular to the axis of the positioning rod; The lowering frame includes a lowering block for pressing the top of the housing. Several vertically extending side legs are provided on the periphery of the lowering frame. A lever is hinged at both ends of the side legs. The hinge axis of the lever is parallel to the axis of the pull rod. A horizontal limiting plate is provided at the bottom of the lever on the side legs. The limiting plate cooperates with the lever so that the lever can only flip upward when the lever moves down to contact the pull rod. The upper side of the lever is provided with an inclined surface. When the inclined surface contacts the bottom of the lever from bottom to top, it causes the lever to move along its own axis and disengage from the first spring.

3. The double bearing press-fitting device for a wheelchair spacer according to claim 2, characterized in that, The top of the lever extends horizontally to the side of the pull rod away from the housing axis; The top of the limiting plate is located on the side of the pull rod closest to the housing axis.

4. The double bearing press-fitting device for a wheelchair spacer according to claim 2, characterized in that, The extension rod has a coaxial shaft hole with the same inner diameter as the positioning rod. The positioning rod is inserted into the shaft hole. The shaft hole has a coaxial mounting hole with an inner diameter larger than that of the shaft hole. The positioning rod has a coaxial side ring with the same outer diameter as the mounting hole. A second spring is installed in the mounting hole, which elastically connects the mounting hole and the side ring. The spring force of the second spring causes the positioning rod to move towards the axis of the housing.

5. The double bearing press-fitting device for a wheelchair spacer according to claim 2, characterized in that, A damping block is slidably installed in the first limiting groove, and the extension rod is inserted into the damping block.

6. The double bearing press-fitting device for a wheelchair spacer according to claim 2, characterized in that, The top periphery of the housing is provided with the same number of protrusions as the side support legs. The side support legs are provided with a second limiting groove extending in the vertical direction. The protrusions move within the second limiting groove. When the lower pressure frame moves up to the bottom of the second limiting groove and fits against the bottom end of the protrusion, the pressing seat moves up synchronously with the lower pressure frame.

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