Device for precisely assembling vacuum pump bearing

Abstract

The invention discloses a device for precise assembly of a vacuum pump bearing, and belongs to the technical field of mechanical equipment assembly. The device for precise assembly of the vacuum pump bearing comprises a counter-force frame and further comprises a first ratchet ring arranged at the top end of a force application pipe, and a check ring arranged on the outer wall of the force application pipe; the impact mechanism comprises a second ratchet ring and a spring, a limiting sliding hole is formed in the counter-force frame, the spring is arranged outside the force application pipe, the bottom end of the spring abuts against the check ring, and the spring is used for applying elastic force towards one side of the shaft rod to the force application pipe so that the first ratchet ring can be in tooth connection with the second ratchet ring; the power device is used for driving the second ratchet ring to rotate, and under the action of the first ratchet ring, the second ratchet ring and the spring, the force application pipe reciprocates towards one side of the matching surface on the shaft rod to impact the bearing. According to the device for precise assembly of the vacuum pump bearing, it can be guaranteed that the force applied to the shaft rod by the bearing is always in the axial direction of the shaft rod, and the coaxiality of the bearing and the shaft rod is guaranteed when the bearing is installed.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical equipment assembly, in particular to a device for precise assembly of vacuum pump bearings. Background Art

[0002] A vacuum pump is a device or equipment that uses mechanical, physical, chemical, or physicochemical methods to evacuate a container to create a vacuum. It is a key device for generating, improving, and maintaining a vacuum environment within a closed space. In the manufacturing and application of vacuum pumps, the precise assembly of bearings and shafts has become a bottleneck restricting the industry's development. Vacuum pump bearings and shafts are typically installed using a method of tightening the opposing end faces. This method creates a tight fit between the shaft and bearing, forcing the shaft to withstand significant axial forces during bearing assembly.

[0003] Currently, the assembly processes for bearings and shafts mainly include traditional hydraulic press fitting, shrink fit, and manual tapping. Traditional hydraulic press fitting involves applying constant pressure to the bearing using hydraulic equipment, forcing the bearing to move axially along the shaft to a predetermined mating position.

[0004] However, while this traditional hydraulic press method can apply high pressure to the bearing to meet the required assembly force for a tight fit between the shaft and bearing, it has certain limitations in practical application. Vacuum pumps, particularly screw vacuum pumps, use relatively slender shafts. These slender shafts have a low critical buckling load when subjected to axial pressure. When traditional hydraulic press equipment applies constant pressure to the bearing, forcing the bearing to move axially along the shaft, the axial force on the shaft rapidly increases. In this situation, the shaft bends, disrupting the ideal coaxial relationship between the bearing and the mating surface as it moves along the shaft to its mating position. This bending causes uneven force on the bearing during press-fitting, resulting in inconsistent circumferential press-fit speeds. Furthermore, the bent shaft alters the baseline for the bearing-shaft fit, causing an angular deviation between the two, which should be coaxial. This deviation can adversely affect the proper operation of the bearing after assembly, increasing friction and vibration during operation. Summary of the Invention

[0005] The purpose of the present invention is to overcome the problems in the prior art and provide a device for precision assembly of vacuum pump bearings, which can ensure the coaxiality of the bearing and the shaft during the bearing installation process, thereby ensuring that the bearing is evenly stressed during the press-fitting process.

[0006] The present invention provides a device for precision assembly of vacuum pump bearings, comprising a reaction frame, on which a shaft to be assembled is fixed in a vertical state, and further comprising: The force tube is vertically arranged, the shaft can pass through the tube hole of the force tube, the bottom end of the force tube abuts against the bearing to be assembled, the top end of the force tube is provided with a first ratchet ring, and the outer wall of the force tube is provided with a retaining ring; The impact mechanism includes a second ratchet ring and a spring. The reaction frame is provided with a limiting sliding hole. The outer wall of the force-applying tube is slidably connected to the limiting sliding hole in the vertical direction. The second ratchet ring is coaxially arranged with the force-applying tube and is rotatably connected to the reaction frame. The spring is arranged outside the force-applying tube, and the bottom end of the spring abuts against the retaining ring. The spring is used to apply an elastic force toward one side of the shaft to the force-applying tube, so that the first ratchet ring and the second ratchet ring are engaged with each other. A power device is connected to the second ratchet ring and is used to drive the second ratchet ring to rotate. Under the action of the first ratchet ring, the second ratchet ring and the spring, the force tube reciprocates to impact the bearing toward the side of the matching surface on the shaft.

[0007] Preferably, a three-jaw chuck is provided on the reaction frame, and the three-jaw chuck is coaxially arranged with the shaft rod. The three-jaw chuck is used to support the bearing to prevent the bearing from rotating radially around itself. Each jaw of the three-jaw chuck is provided with a clamping arc surface, and the clamping arc surface fits with the outer wall of the bearing. The axis of the clamping arc surface is coaxial with the axis of the shaft rod. Under the impact of the force tube, the bearing can slide relative to the clamping arc surface along the axial direction of the shaft rod.

[0008] Preferably, a shell is provided outside the force-applying tube, the three-jaw chuck is provided on the shell, a lifting mechanism is provided on the reaction frame, the lifting mechanism is connected to the shell, and a spacing detection mechanism is provided on the three-jaw chuck. The spacing detection mechanism is used to detect the maximum spacing value between the bottom end of the force-applying tube and the upper end face of the bearing when the force-applying tube is lifted. The spacing detection mechanism is electrically connected to a controller, and the controller is electrically connected to the lifting mechanism. A predetermined spacing value is preset in the controller. The controller controls the action of the lifting mechanism according to the maximum spacing value and the predetermined spacing value so that the maximum spacing value is equal to the predetermined spacing value.

[0009] Preferably, the spacing detection mechanism includes a plurality of spring pins and a first pressure sensor, the plurality of spring pins are evenly distributed along the circumference of the shaft at the bottom end of the three-jaw chuck, the top end of the bearing is abutted with a slip ring, the top end of the slip ring abuts against the plurality of spring pins, the first pressure sensor is used to detect the real-time extrusion force exerted on each spring pin, the first pressure sensor is electrically connected to the controller, and the controller is used to calculate the spacing between the slip ring and the three-jaw chuck based on the real-time extrusion force exerted on each spring pin.

[0010] Preferably, a second pressure sensor is provided at the bottom end of the second ratchet ring, the second pressure sensor abuts against the top end of the spring, the second pressure sensor is electrically connected to the controller, and the second pressure sensor is used to detect the maximum elastic force of the spring.

[0011] Preferably, the outer wall of the force-applying tube is provided with an external thread, and the retaining ring is provided with a threaded hole. The retaining ring is connected to the outside of the force-applying tube through the threaded hole. According to the maximum elastic force of the spring, the retaining ring is rotated to adjust the pre-compression amount of the spring.

[0012] Preferably, the reaction frame is provided with a limiting ring and a positioning groove, the limiting ring is fixedly connected to the reaction frame, the limiting ring is vertically arranged, the shaft rod passes through the limiting ring and fits with the inner wall of the limiting ring, the positioning groove is arranged at the bottom end of the reaction frame and is located directly below the limiting ring, and the positioning groove is used to limit the shaking of the shaft rod.

[0013] Preferably, the power device is connected to a transmission shaft, a gear is provided on the transmission shaft, a turntable is provided at the bottom end of the second ratchet ring, a tooth block is provided on the outer wall of the turntable, and the gear is gear-engaged with the tooth block.

[0014] Preferably, the bottom end of the force-applying tube abuts against the top end of the inner ring of the bearing.

[0015] Preferably, the first ratchet ring is detachably connected to the force applying tube.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: a device for precision assembly of vacuum pump bearings of the present invention, when assembling the bearing, by driving the second ratchet ring to rotate, under the action of the first ratchet ring, the second ratchet ring and the elastic force of the spring, the force tube can only reciprocate along the axial direction of the shaft rod, thereby reciprocatingly impacting the bearing abutting the bottom end of the force tube, thereby slowly squeezing the bearing into the mating surface on the shaft rod. In this process, when the force tube impacts the bearing, the bearing will squeeze the shaft rod after being impacted, causing the shaft rod to undergo slight elastic bending deformation. When the force tube is disengaged from the bearing, the shaft rod will recover under the action of its own stress, thereby restoring its original straightness, so that the force applied by the bearing to the shaft rod is always along the axial direction of the shaft rod, thereby ensuring the coaxiality of the bearing and the shaft rod during the installation of the bearing, and further ensuring that the bearing is subjected to uniform force during the press-fitting process.

[0017] Each jaw of the three-jaw chuck applies a supporting force to the bearing toward the bearing axis, thereby preventing the bearing from shaking in the horizontal direction when it is subjected to the impact force of the force-applying tube, ensuring that the bearing can only move in the vertical direction, thereby further ensuring the coaxiality of the bearing with the shaft when installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of the first working state of the present invention; Figure 2 This is a left-side structural schematic diagram of the first working state of the present invention; Figure 3 This is a left-side structural schematic diagram of the second working state of the present invention; Figure 4Schematic diagram of the structure of the AA surface of the present invention Figure 5 Schematic diagram of the structure of the BB surface of the present invention Figure 6 It is a structural schematic diagram of the impact mechanism of the present invention.

[0019] Description of reference numerals: 101. Reaction frame; 102. Shaft; 103. Force-applying tube; 104. Bearing; 105. First ratchet ring; 106. Retaining ring; 107. Housing; 108. Turntable; 109. Spring; 110. Second ratchet ring; 201. Three-jaw chuck; 202. Clamping jaws; 3. Lifting mechanism; 401. Spring thimble; 402. First pressure sensor; 403. Slip ring; 5. Second pressure sensor; 601. Limiting ring; 602. Positioning groove; 701. Drive shaft; 702. Gear. DETAILED DESCRIPTION

[0020] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figures 1-6 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by persons having ordinary skills in the field to which the invention belongs. “Include” or “comprising” and similar words mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. “Inside”, “outside”, “upper”, “lower”, “far”, “near”, “front”, “back”, etc. are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0022] like Figures 1-6As shown, the device for precision assembly of vacuum pump bearings provided by the present invention includes a reaction frame 101, a shaft rod 102 to be assembled is fixed on the reaction frame 101 in a vertical state, and also includes: a force tube 103, an impact mechanism and a power device, the force tube 103 is vertically arranged, the shaft rod 102 can pass through the tube hole of the force tube 103, the bottom end of the force tube 103 abuts against the bearing 104 to be assembled, the top of the force tube 103 is provided with a first ratchet ring 105, and the outer wall of the force tube 103 is provided with a retaining ring 106; the impact mechanism includes a second ratchet ring 110 and a spring 109, a limiting sliding hole is provided on the reaction frame 101, and the outer wall of the force tube 103 is slidably connected to the In the limiting sliding hole, the second ratchet ring 110 is coaxially arranged with the force tube 103 and is rotatably connected with the reaction frame 101. The spring 109 is arranged outside the force tube 103, and the bottom end of the spring 109 abuts against the retaining ring 106. The spring 109 is used to apply an elastic force toward the side of the shaft 102 to the force tube 103 so that the first ratchet ring 105 is toothed with the second ratchet ring 110; the power device is connected to the second ratchet ring 110, and the power device is used to drive the second ratchet ring 110 to rotate. Under the action of the first ratchet ring 105, the second ratchet ring 110 and the spring 109, the force tube 103 reciprocates toward the side of the mating surface on the shaft 102 to impact the bearing 104.

[0023] The working principle of the above embodiment is briefly described below: When using this device to assemble bearing 104, bearing 104 is passed through the top of shaft 102 and precisely positioned and clamped to ensure shaft 102 is fixed vertically to reaction frame 101, providing a stable reference for subsequent assembly. When bearing 104 moves down along shaft 102 to the top of its mating surface (i.e., where bearing 104 is installed), the bottom end of force-applying tube 103 is precisely brought into contact with the top of bearing 104. At this point, retaining ring 106 on the outer wall of force-applying tube 103 and spring 109 form an elastic support structure. Under the preload of spring 109, first ratchet ring 105 and second ratchet ring 110 are tightly meshed.

[0024] The power device (such as a servo motor or hydraulic drive mechanism) is started, and the power output drives the second ratchet ring 110 to rotate at a constant speed around the axis of the shaft 102. Because the limiting sliding hole forms a circumferential constraint on the force-applying tube 103, the force-applying tube 103 can only slide axially and cannot rotate with the second ratchet ring 110, causing the second ratchet ring 110 to rotate relative to the first ratchet ring 105. When the second ratchet ring 110 rotates relative to the first ratchet ring 105, the ratchet inclined surfaces of the two generate an interaction force. This interaction force, coordinated with the elastic force of the spring 109, is converted into reciprocating motion of the force-applying tube 103 along the axial direction of the shaft 102. When the second ratchet ring 110 and the first ratchet ring 105 engage in ratchet meshing, the force-applying tube 103 impacts the bearing 104 downward. When the second ratchet ring 110 and the first ratchet ring 105 disengage, the spring 109 pushes the force-applying tube 103 to return to its original position, forming a high-frequency impact cycle.

[0025] As the bottom end of the force-applying tube 103 continuously impacts the bearing 104, the bearing 104 is subjected to the axial impact force and squeezes the shaft 102, causing the shaft 102 to slightly bend and deform due to the elasticity of the material. At the moment the force-applying tube 103 separates from the bearing 104, the shaft 102 quickly recovers its straightness under the action of its own material stress. This dynamic process of "elastic deformation-reset" plays a key role: on the one hand, the elastic buffering of the shaft 102 avoids damage to the mating surface caused by rigid impact; on the other hand, the axial tension generated during reset and the impact force of the force-applying tube 103 form a combined force, always keeping the force acting on the bearing 104 strictly along the axial direction of the shaft 102, thereby ensuring that the axis of the bearing 104 and the axis of the shaft always remain highly coaxial as it slowly squeezes into the mating surface.

[0026] The present invention's precision assembly device for vacuum pump bearings 104 and shafts 102 utilizes ratchet engagement and the elastic force of spring 109 to precisely adjust the reciprocating impact frequency and force of the force-applying tube 103. Combined with the elastic reset mechanism of shaft 102, this device maintains the coaxiality error between bearing 104 and shaft 102 within a minimal range, meeting the stringent requirements for bearing 104 assembly in precision equipment such as vacuum pumps. Furthermore, unlike the rigid force application of conventional hydraulic press-fitting, this device utilizes high-frequency, low-amplitude impacts and elastic cushioning from shaft 102, avoiding plastic deformation or scratching on the mating surface between the inner ring of bearing 104 and shaft 102 due to stress concentration, thereby extending the service life of the components.

[0027] On the basis of the above embodiment, in order to ensure that the bearing 104 can only move in the vertical direction, the coaxiality of the bearing 104 and the shaft 102 during installation is further ensured.

[0028] like Figure 1-Figure 3 and Figure 6As shown, a three-jaw chuck 201 is provided on the reaction frame 101, and the three-jaw chuck 201 is coaxially arranged with the shaft 102. The three-jaw chuck 201 is used to support the bearing 104 to prevent the bearing 104 from rotating radially around itself. Each clamping jaw 202 of the three-jaw chuck 201 is provided with a clamping arc surface, and the clamping arc surface is in contact with the outer wall of the bearing 104. The axis of the clamping arc surface is coaxial with the axis of the shaft 102. Under the impact of the force tube 103, the bearing 104 can slide relative to the clamping arc surface along the axial direction of the shaft 102.

[0029] By setting up a three-jaw chuck 201, the three-jaw chuck 201 can be used to precisely clamp the bearing 104 before the bearing 104 is installed. Specifically, the three-jaw chuck 201 is coaxially arranged with the shaft 102, and its three jaws 202 are evenly distributed circumferentially. When the operator places the bearing 104 on top of the three-jaw chuck 201, by adjusting the position of the jaws 202, the clamping arc surface on each jaw 202 can be tightly fitted with the outer wall of the bearing 104. This clamping method not only stabilizes the position of the bearing 104, but also provides a precise guide reference for the shaft 102 when it passes through the inner hole of the bearing 104, avoiding positional deviation caused by the shaking of the bearing 104 during the insertion of the shaft 102, effectively improving the convenience and accuracy of operation in the early stage of assembly; and when the bearing 104 enters the installation process, the clamping function of the three-jaw chuck 201 plays a key role. Since the axis of the clamping arc surface is strictly coaxial with the axis of the shaft 102, and the clamping arc surface of each clamping jaw 202 is in contact with the outer wall of the bearing 104, when the force tube 103 applies an axial impact force to the bearing 104, each clamping jaw 202 of the three-jaw chuck 201 will simultaneously apply a uniform supporting force to the bearing 104 toward the axis of the bearing 104. This supporting force forms a circumferential constraint, which can effectively offset the horizontal component of force that may be caused by the impact force, preventing the bearing 104 from shaking or deflecting horizontally when subjected to impact. Under this mechanism, the bearing 104 can only move along the vertical axis of the shaft 102, ensuring that the axis of the bearing 104 always remains highly coaxial with the axis of the shaft 102 during the entire process of being impact-pressed. This precise limiting effect forms a synergistic effect with the reciprocating impact mechanism of the force tube 103 and the elastic reset mechanism of the shaft 102, further enhancing the control accuracy of coaxiality during the assembly process, so that the matching error between the bearing 104 and the shaft 102 can be controlled within the micron range, fully meeting the stringent requirements of precision equipment such as vacuum pumps for the assembly of core components.

[0030] As a preferred solution, Figure 1-Figure 5As shown, the force tube 103 is provided with a shell 107 outside, the three-jaw chuck 201 is provided on the shell 107, the reaction frame 101 is provided with a lifting mechanism 3, the lifting mechanism 3 is connected to the shell 107, and the three-jaw chuck 201 is provided with a spacing detection mechanism, the spacing detection mechanism is used to detect the maximum spacing value between the bottom end of the force tube 103 and the upper end face of the bearing 104 when the force tube 103 is lifted, the spacing detection mechanism is electrically connected to a controller, the controller is electrically connected to the lifting mechanism 3, a predetermined spacing value is preset in the controller, and the controller controls the lifting mechanism 3 to move according to the maximum spacing value and the predetermined spacing value so that the maximum spacing value is equal to the predetermined spacing value. The second ratchet ring 110 is rotatably connected to the housing 107, and the limiting sliding hole is provided on the housing 107. In the process of the force tube 103 reciprocatingly impacting the bearing 104, the spacing detection mechanism is used to detect the maximum spacing value between the bottom end of the force tube 103 and the upper end face of the bearing 104 when the force tube 103 is lifted, and the controller is used to control the action of the lifting mechanism 3 according to the relationship between the maximum spacing value and the predetermined spacing value, so that the maximum spacing value is equal to the predetermined spacing value, so that the force tube 103 can move with the feed movement of the bearing 104 toward the side of the mating surface of the shaft rod 102, ensuring that the stroke of the force tube 103 during each impact is relatively fixed, and because the elastic coefficient of the spring 109 is fixed, it can ensure that the impact force exerted on the bearing 104 each time is relatively constant, thereby ensuring that the extrusion force exerted on the shaft rod 102 is constant each time, ensuring that the shaft rod 102 can stably return to a vertical state, and effectively ensuring the coaxiality of the bearing 104 and the shaft rod 102.

[0031] As a preferred solution, Figure 1-Figure 3 、 Figure 5 and Figure 6As shown, the spacing detection mechanism includes multiple spring pins 401 and a first pressure sensor 402. The multiple spring pins 401 are evenly distributed at the bottom end of the three-jaw chuck 201 along the circumference of the shaft 102. The top of the bearing 104 is abutted with a slip ring 403. The top of the slip ring 403 abuts against the multiple spring pins 401. The first pressure sensor 402 is used to detect the real-time extrusion force exerted on each spring pin 401. The first pressure sensor 402 is electrically connected to the controller. The controller is used to calculate the spacing between the slip ring 403 and the three-jaw chuck 201 according to the real-time extrusion force exerted on each spring pin 401. Since the slip ring 403 is in contact with the bearing 104, when the bearing 104 is fed toward the side of the mating surface of the shaft 102, the slip ring 403 will also move with the movement of the bearing 104, thereby increasing the distance between the top of the slip ring 403 and the bottom of the three-jaw chuck 201, causing the compression amount of the multiple spring ejectors 401 to change. The spring ejector 401 is elastic and can be stretched, so the extrusion force on the spring ejector 401 changes. The extrusion force on the spring ejector 401 is proportional to the distance between the bottom of the three-jaw chuck 201 and the top of the slip ring 403. The first pressure sensor 402 detects the pressure of the multiple spring ejectors 401 arranged along the circumference of the shaft 102. The elastic force exerted on the spring pin 401 can detect the distance between multiple points on the slip ring 403 and the corresponding multiple points on the three-jaw chuck 201, so that the distance between the slip ring 403 and the three-jaw chuck 201 can be accurately known. Since the tooth heights of the first ratchet ring 105 and the second ratchet ring 110 are fixed, when the force tube 103 is lifted, the distance between the bottom end of the force tube 103 and the bottom end of the three-jaw chuck 201 is fixed. Therefore, the precise distance value between the top end of the slip ring 403 and the bottom end of the force tube 103 can be calculated, thereby further ensuring that the stroke of the force tube 103 is constant during each impact, and ensuring that the extrusion force on the shaft 102 is constant each time.

[0032] As a preferred solution, Figure 1-Figure 3 and Figure 5 As shown, a second pressure sensor 5 is provided at the bottom end of the second ratchet ring 110. The second pressure sensor 5 abuts against the top end of the spring 109. The second pressure sensor 5 is electrically connected to the controller and is used to detect the maximum elastic force of the spring 109. By providing the second pressure sensor 5 and detecting the maximum elastic force of the spring 109 through the second pressure sensor 5, the magnitude of the impact force applied to the bearing 104 by the force-applying tube 103 each time it impacts can be determined, thereby achieving accurate monitoring of the extrusion force on the shaft 102.

[0033] As a preferred solution, Figure 1-Figure 3 and Figure 6As shown, the outer wall of the force-applying tube 103 is provided with an external thread, and the retaining ring 106 is provided with a threaded hole. The retaining ring 106 is connected to the outside of the force-applying tube 103 through the threaded hole. According to the maximum elastic force of the spring 109, the retaining ring 106 is rotated to adjust the pre-compression amount of the spring 109. By detecting the maximum elastic force of the spring 109 by the second pressure sensor 5, the magnitude of the impact force of the force-applying tube 103 during each impact can be known, and the deformation of the shaft 102 can be observed. When the amplitude of the single deformation of the shaft 102 is large, the retaining ring 106 is rotated in the opposite direction to reduce the pre-compression of the spring 109. Since the tooth heights of the first ratchet ring 105 and the second ratchet ring 110 are fixed, when the pre-compression of the spring 109 is reduced, the incremental compression of the spring 109 remains unchanged, and the final elastic force of the spring 109 is reduced, thereby reducing the impact force of each impact of the force-applying tube 103, thereby reducing the impact force received by the shaft 102 each time when it is impacted, so as to weaken the deformation of the shaft 102 each time, thereby ensuring the coaxiality of the bearing 104 and the shaft 102. When the amplitude of the single deformation of the shaft 102 is small, conversely, the pre-compression of the spring 109 can be appropriately increased to increase the impact force received by the shaft 102 each time, so as to increase the installation speed of the bearing 104.

[0034] As a preferred solution, Figure 1-Figure 3 As shown, a limiting ring 601 and a positioning groove 602 are provided on the reaction frame 101. The limiting ring 601 is fixedly connected to the reaction frame 101, the limiting ring 601 is vertically arranged, the shaft rod 102 passes through the limiting ring 601 and fits with the inner wall of the limiting ring 601, the positioning groove 602 is provided at the bottom end of the reaction frame 101 and is located directly below the limiting ring 601, and the positioning groove 602 is used to limit the shaking of the shaft rod 102. By setting a positioning groove 602 on the reaction frame 101, inserting the bottom end of the shaft rod 102 into the positioning groove 602, and then passing the top end of the shaft rod 102 through the limiting ring 601 above the positioning groove 602, the positioning groove 602 can limit the shaking of the shaft rod 102 when it is impacted, and the limiting ring 601 can limit the swing of the shaft rod 102 when it is impacted, so that the shaft rod 102 can be kept in a vertical state to the maximum extent, thereby further ensuring the coaxiality of the bearing 104 and the shaft rod 102 when installed.

[0035] As a preferred solution, Figure 2 and Figure 3 As shown, the power device is connected to a transmission shaft 701, which is provided with a gear 702. A rotary disk 108 is provided at the bottom end of the second ratchet ring 110. A tooth block is provided on the outer wall of the rotary disk 108, and the gear 702 is engaged with the tooth block. The power device drives the gear 702 to rotate via the transmission shaft 701, thereby driving the rotary disk 108 to rotate via the tooth block, thereby driving the second ratchet ring 110 to rotate relative to the first ratchet ring 105.

[0036] As a preferred solution, Figure 3 As shown, the bottom end of the force-applying tube 103 abuts against the top of the inner ring of the bearing 104. When the force-applying tube 103 abuts against the top of the inner ring of the bearing 104, the outer ring of the bearing 104 is prevented from being stressed when the force-applying tube 103 impacts the bearing 104, thereby preventing the bearing 104 from being damaged during installation.

[0037] As a preferred solution, Figure 1 and Figure 6 As shown, the first ratchet ring 105 is detachably connected to the force-applying tube 103. The first ratchet ring 105 and the force-applying tube 103 are detachably connected, which facilitates the disassembly and installation of the first ratchet ring 105, thereby facilitating the maintenance of the device.

[0038] While the embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes, modifications, substitutions, and alterations can be made to the embodiments without departing from the principles and spirit of the invention.

Claims

1. A device for precision assembly of vacuum pump bearings, comprising a reaction frame, on which a shaft to be assembled is fixed in a vertical position, characterized in that: Also includes: The force tube is vertically arranged, the shaft can pass through the tube hole of the force tube, the bottom end of the force tube abuts against the bearing to be assembled, the top end of the force tube is provided with a first ratchet ring, and the outer wall of the force tube is provided with a retaining ring; The impact mechanism includes a second ratchet ring and a spring. The reaction frame is provided with a limiting sliding hole. The outer wall of the force-applying tube is slidably connected to the limiting sliding hole in the vertical direction. The second ratchet ring is coaxially arranged with the force-applying tube and is rotatably connected to the reaction frame. The spring is arranged outside the force-applying tube, and the bottom end of the spring abuts against the retaining ring. The spring is used to apply an elastic force toward one side of the shaft to the force-applying tube, so that the first ratchet ring and the second ratchet ring are engaged with each other. A power device is connected to the second ratchet ring and is used to drive the second ratchet ring to rotate. Under the action of the first ratchet ring, the second ratchet ring and the spring, the force tube reciprocates to impact the bearing toward the side of the matching surface on the shaft.

2. The vacuum pump bearing precision assembly device according to claim 1, characterized in that: The reaction frame is provided with a three-jaw chuck, which is coaxially arranged with the shaft rod. The three-jaw chuck is used to support the bearing to prevent the bearing from rotating radially around itself. Each jaw of the three-jaw chuck is provided with a clamping arc surface, which fits the outer wall of the bearing. The axis of the clamping arc surface is coaxial with the axis of the shaft rod. Under the impact of the force tube, the bearing can slide relative to the clamping arc surface along the axial direction of the shaft rod.

3. The device for precision assembly of vacuum pump bearings according to claim 2, characterized in that: A shell is provided outside the force-applying tube, the three-jaw chuck is provided on the shell, a lifting mechanism is provided on the reaction frame, the lifting mechanism is connected to the shell, and a spacing detection mechanism is provided on the three-jaw chuck. The spacing detection mechanism is used to detect the maximum spacing value between the bottom end of the force-applying tube and the upper end face of the bearing when the force-applying tube is lifted. The spacing detection mechanism is electrically connected to a controller, and the controller is electrically connected to the lifting mechanism. A predetermined spacing value is preset in the controller. The controller controls the action of the lifting mechanism according to the maximum spacing value and the predetermined spacing value so that the maximum spacing value is equal to the predetermined spacing value.

4. The vacuum pump bearing precision assembly device according to claim 3, characterized in that: The spacing detection mechanism includes multiple spring pins and a first pressure sensor. The multiple spring pins are evenly distributed at the bottom end of the three-jaw chuck along the circumference of the shaft. The top end of the bearing is abutted with a slip ring, and the top end of the slip ring abuts against the multiple spring pins. The first pressure sensor is used to detect the real-time extrusion force exerted on each spring pin. The first pressure sensor is electrically connected to the controller, and the controller is used to calculate the spacing between the slip ring and the three-jaw chuck based on the real-time extrusion force exerted on each spring pin.

5. The vacuum pump bearing precision assembly device according to claim 1, characterized in that: A second pressure sensor is provided at the bottom end of the second ratchet ring, the second pressure sensor abuts against the top end of the spring, the second pressure sensor is electrically connected to the controller, and the second pressure sensor is used to detect the maximum elastic force of the spring.

6. The vacuum pump bearing precision assembly device according to claim 5, characterized in that: The outer wall of the force-applying tube is provided with an external thread, and the retaining ring is provided with a threaded hole. The retaining ring is connected to the outside of the force-applying tube through the threaded hole. According to the maximum elastic force of the spring, the retaining ring is rotated to adjust the pre-compression amount of the spring.

7. The device for precision assembly of vacuum pump bearings according to claim 1, wherein: The reaction frame is provided with a limiting ring and a positioning groove. The limiting ring is fixedly connected to the reaction frame, the limiting ring is vertically arranged, the shaft rod passes through the limiting ring and fits with the inner wall of the limiting ring, the positioning groove is arranged at the bottom end of the reaction frame and is located directly below the limiting ring, and the positioning groove is used to limit the shaking of the shaft rod.

8. The vacuum pump bearing precision assembly device according to claim 1, wherein: The power device is connected to a transmission shaft, a gear is provided on the transmission shaft, a turntable is provided at the bottom end of the second ratchet ring, a tooth block is provided on the outer wall of the turntable, and the gear is gear-connected with the tooth block.

9. The vacuum pump bearing precision assembly device according to claim 1, characterized in that: The bottom end of the force applying tube abuts against the top end of the inner ring of the bearing.

10. The vacuum pump bearing precision assembly device according to claim 1, wherein: The first ratchet ring is detachably connected to the force applying tube.

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