Sleeve replacing mechanism and automatic sleeve replacing device

Abstract

The invention discloses a sleeve replacing mechanism. The sleeve replacing mechanism comprises an upper supporting shaft and a lower replaceable shaft capable of sliding relative to the upper supporting shaft. The device further comprises a sliding locking assembly which is arranged between the upper supporting shaft and the lower replaceable shaft in a sliding mode, and positioning fit between the lower replaceable shaft and the sliding locking assembly is locked or released in a sliding mode. The first buffering assembly is used for buffering impact force generated during locking; and the second buffering assembly is used for buffering impact force generated when the replaceable lower shaft is installed. According to the sleeve replacing mechanism, double buffering is achieved, the impact force generated during locking can be buffered, the impact force generated during replacement of the replaceable lower shaft can be buffered, the structure is simple and easy to achieve, and the service life of the sleeve replacing mechanism can be prolonged. The invention further provides an automatic sleeve replacing device, the sleeve can be fully automatically replaced in an automatic production line, and the working efficiency is greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of industrial robot application in mechanical assembly, and in particular to a sleeve replacement mechanism, and also to an automatic sleeve replacement device using the sleeve replacement mechanism. Background Art

[0002] In mechanical automation production lines, tightening bolts is a very common process. Different products often need to install bolts of different sizes and specifications, and different sleeves need to be replaced when the specifications of the bolts to be tightened change.

[0003] The quick-change sleeve device is a product that is often used when replacing sleeves. During use, the sleeve needs to be frequently slid to lock or unlock. It is also necessary to frequently remove the replaceable lower shaft, replace the sleeve of the required specifications on its lower part, and then reinstall the replacement lower shaft into the quick-change sleeve device through impact force. Such frequent impact force will cause certain damage to the locking part and the replaceable lower shaft. The wear damage cannot be repaired, so the quick-change sleeve device in the prior art needs to be replaced after a certain period of use, which increases the production cost of the enterprise.

[0004] Moreover, on the automated production line, if the product is changed, it is often necessary to manually enter the automated equipment to replace the sleeve, which often requires the line to be stopped and production to be stopped, affecting production efficiency. If the automated production equipment is installed with a saturated installation tightening shaft, switching the tightening shaft to be compatible with bolts of different specifications for different products will result in high equipment costs. Summary of the invention

[0005] In view of this, the present application proposes a sleeve replacement mechanism to achieve double buffering during the sleeve replacement process, which can not only buffer the impact force generated during locking but also buffer the impact force generated when replacing the replaceable shaft. The structure is simple and easy to implement and can extend the service life of the sleeve replacement mechanism; an automatic sleeve replacement device is also provided in the present application, which can realize fully automatic sleeve replacement in an automated production line, greatly improving work efficiency.

[0006] On the one hand, according to the technical solution of the present application, a sleeve replacement mechanism is proposed, including a supporting upper shaft and a replaceable lower shaft that can slide relative to the supporting upper shaft; also including a sliding locking assembly, which can be slidably arranged between the supporting upper shaft and the replaceable lower shaft, and locks or releases the positioning cooperation between the replaceable lower shaft and the sliding locking assembly by sliding; and a first buffer assembly for buffering the impact force generated during locking; and a second buffer assembly for buffering the impact force generated when installing the replaceable lower shaft.

[0007] Preferably, the supporting upper shaft, the replaceable lower shaft, the sliding locking assembly, the first buffer assembly and the second buffer assembly are all coaxially arranged;

[0008] The first buffer assembly is disposed in the inner cavity of the sliding locking assembly, and the second buffer assembly is disposed in the cavity between the sliding locking assembly and the replaceable shaft;

[0009] The sliding locking assembly is simultaneously in contact with the supporting upper shaft and the replaceable lower shaft and is slidably connected.

[0010] Preferably, the sliding locking assembly comprises a sliding sleeve, a retaining sleeve and a locking member, the upper portion of the sliding sleeve is provided with a buffer portion for accommodating the first buffer assembly, the middle portion is provided with a locking portion for locking, and the lower portion is provided with an unlocking portion; the inner hole diameter of the unlocking portion is larger than the inner hole diameter of the locking portion;

[0011] The diameter of the upper inner hole of the retaining sleeve is larger than that of the lower inner hole, a first step plane is formed at the junction of the upper and lower parts, an annular positioning groove is arranged on the inner hole wall of the upper part, a second step surface is arranged on the outer peripheral surface of the retaining sleeve, the second step surface supports the sliding sleeve in the axial direction, and through holes are symmetrically arranged on the hole wall of the retaining sleeve;

[0012] The locking member is spherical and is disposed in the through hole when the sleeve replacement mechanism is assembled.

[0013] The retaining sleeve is slidably mounted on the upper outer circumferential surface of the replaceable shaft, and the outer circumferential surface of the retaining sleeve is slidably and contactably mounted on the inner hole of the locking portion of the sliding sleeve;

[0014] The wall thickness of the retaining sleeve is smaller than the diameter of the locking piece; in the locked state, the installation distance A between the upper end surface of the sleeve and the positioning surface of the supporting upper shaft that can provide axial positioning for the sleeve is greater than the diameter of the locking piece.

[0015] Preferably, the first buffer component is evenly arranged between the retaining sleeve and the buffer portion of the sliding sleeve in the circumferential direction, and the first buffer component is made of elastic material;

[0016] An internal threaded blind hole is arranged at the axis center of the lower part of the supporting upper shaft, and positioning through holes are symmetrically arranged in the radial direction of the lower outer circumference in a direction perpendicular to the axis center of the supporting upper shaft and radially penetrate the internal threaded blind hole; an annular locking groove matching the diameter of the locking piece is arranged in the circumferential direction of the upper outer circle of the replaceable shaft.

[0017] Preferably, the second buffer assembly comprises a positioning sleeve, an elastic buffer, a set screw, a positioning pin and a force transmission member;

[0018] The positioning pin is movably arranged in the positioning through hole, and the positioning pin and the positioning through hole are arranged to be matched with a small clearance;

[0019] The set screw is threadably screwed into the internal thread blind hole, and the force transmission member is arranged between the upper end surface of the set screw and the centripetal end of the positioning pin and in contact with both of them;

[0020] The centrifugal end of the positioning pin is inserted into the annular positioning groove provided on the inner hole wall of the upper part of the retaining sleeve, so as to maintain the axial positioning of the retaining sleeve and the supporting upper shaft;

[0021] The positioning sleeve and the elastic buffer are arranged in a cavity formed between the supporting upper shaft, the replaceable lower shaft and the retaining sleeve;

[0022] The positioning sleeve comprises a positioning step portion and a sliding portion. The outer diameter of the positioning step portion is matched with the upper inner hole of the retaining sleeve, and the outer diameter of the sliding portion is matched with the lower inner hole of the retaining sleeve.

[0023] Preferably, the elastic buffer is evenly arranged between the outer wall of the supporting upper shaft and the inner hole wall of the positioning sleeve in the circumferential direction, and the elastic buffer is made of elastic material;

[0024] In the locked state, there is a safety distance B between the upper end surface of the positioning sleeve and the positioning pin, ranging from 0.5mm to 1mm, and a buffer distance C is provided between the lower end surface of the outer circle of the positioning step portion and the first step plane (321).

[0025] On the other hand, the present application also provides an automatic sleeve replacement device, comprising the above-mentioned sleeve replacement mechanism, and also comprising a mounting base plate, a replacement clamping mechanism and a fixed base detachably fixedly connected to the sleeve replacement mechanism;

[0026] The replacement clamping mechanism comprises a toggle assembly fixedly arranged on the mounting base plate for sliding the sliding sleeve and a clamping assembly for fixing the replacement sleeve mechanism in the axial direction.

[0027] Preferably, a through-hole is provided at a position radially passing through the axis of the replaceable shaft in the middle of the replaceable shaft, and a tightly fitting fixing pin is provided inside the hole, the length of the fixing pin is greater than the diameter of the replaceable shaft at the installation position, and the distances at both ends exceeding the outer circumference of the replaceable shaft are equal;

[0028] An axial straight groove is arranged on the inner wall of the fixed base, and an annular mounting groove is arranged on the inner wall intersecting with and perpendicular to the straight groove space. The maximum diameters of the straight groove and the annular mounting groove exceed the length of the fixed pin.

[0029] Preferably, the fixing pin is provided with an annular centering groove in the middle;

[0030] An internal threaded hole is arranged at the center of the replaceable shaft and is connected with the fixed through hole. A centering screw is installed in the internal threaded hole through the internal thread connection. The lower end of the centering screw is clamped in the annular centering groove of the fixed pin.

[0031] Preferably, the toggle assembly comprises a first cylinder and a clamping portion fixed to the piston end of the first cylinder, wherein the clamping portion can contact the lower end surface of the sleeve and push the sleeve to slide upward as the cylinder piston extends;

[0032] The clamping assembly includes a horizontally arranged second cylinder and a third cylinder perpendicular to the extension and retraction direction of the piston of the second cylinder and moving with the piston of the second cylinder. A clamping part is fixedly arranged on the top of the piston of the third cylinder. The clamping part can realize top-down clamping of the sleeve replacement mechanism through the movement of the second cylinder and the third cylinder.

[0033] The sleeve replacement mechanism according to the present application has an ingenious design concept, and two cavities are set in a limited small space to install the first buffer assembly and the second buffer assembly. The positioning pin of the second buffer assembly is used to keep the sleeve fixedly connected to the support upper shaft. The technical solution uses the space of the inner core of the support upper shaft to set the force route of the set screw, the force transmission member, and the positioning pin, and changes the direction of the force acting on the set screw that coincides with the axis to a force perpendicular to the axis to achieve control of the positioning pin.

[0034] The sleeve replacement mechanism of the present application can realize double buffering in the process of sleeve replacement, which can not only buffer the impact force of the sliding sleeve on the supporting upper shaft, but also buffer the impact force of the replaceable lower shaft on the supporting upper shaft. The structural design is exquisite and does not take up space, is easy to implement, and can effectively protect the mechanical parts of the sleeve replacement mechanism; the automatic sleeve replacement device provided in the present application has a more streamlined structure, fewer parts, and low production cost. It can realize full-automatic rapid changeover in the automated production line, greatly improving work efficiency.

[0035] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present application, and the schematic implementation modes and descriptions of the present application are used to explain the present application. In the accompanying drawings:

[0037] Figure 1 It is a three-dimensional appearance diagram of the sleeve replacement mechanism;

[0038] Figure 2 is a cross-sectional view of the sleeve replacement mechanism;

[0039] Figure 3 It is a perspective view of the sliding sleeve;

[0040] Figure 4 is a three-dimensional schematic diagram of the sleeve;

[0041] Figure 5 is a perspective view of the retaining sleeve;

[0042] Figure 6 is a three-dimensional schematic diagram of the retaining sleeve;

[0043] Figure 7 This is a perspective view of the positioning sleeve;

[0044] Figure 8 This is a three-dimensional schematic diagram of the positioning sleeve;

[0045] Fig. 9 is a cross-sectional view of the sleeve replacement mechanism;

[0046] Fig.10 It is a three-dimensional schematic diagram of the fixed base;

[0047] Fig.11 is a three-dimensional schematic diagram of an automatic sleeve replacement device;

[0048] Fig.12 It is a three-dimensional schematic diagram of the automatic sleeve replacement device.

[0049] Figure numbers: 1-support upper shaft; 2-replaceable lower shaft; 3-sliding locking assembly; 31-sliding sleeve; 311-buffering part; 312-locking part; 313-unlocking part; 32-retaining sleeve; 321-first step plane; 322-second step surface; 323-through hole; 324-annular positioning groove; 33-locking member; 4-first buffer assembly; 5-second buffer assembly; 51-positioning sleeve; 511-positioning step part; 512-sliding part; 52-elastic buffer member; 53-setting screw; 54-positioning pin; 55-force transmission member; 6-mounting base; 7-sliding assembly; 71-first cylinder; 72-clamping part; 8-pressing assembly; 81-second cylinder; 82-third cylinder; 83-pressing part; 9-fixed base; 91-fixed column pin; 92-straight groove; 93-annular mounting groove; 94-centering screw; DETAILED DESCRIPTION

[0050] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the implementation modes.

[0051] like Figure 1 and Figure 2As shown, a specific embodiment of the present application provides a sleeve replacement mechanism, comprising a supporting upper shaft 1, and a replaceable lower shaft 2 that can slide relative to the supporting upper shaft 1;

[0052] A sliding locking assembly 3, which can be slidably arranged between the supporting upper shaft and the replaceable shaft, and locks or releases the positioning cooperation between the replaceable shaft 2 and the sliding locking assembly 3 by sliding; and a first buffer assembly 4 for buffering the impact force generated during locking, and also includes a second buffer assembly 5 for buffering the impact force generated when installing the replaceable shaft 2.

[0053] In use, when the sliding locking assembly 3 slides upward to the limited position supporting the lower end of the upper shaft 1, the limit of the sliding locking assembly 3 on the replaceable shaft 2 can be released, and the replaceable shaft 2 can be taken out from the sleeve replacement mechanism. After the lower part of the replaceable shaft 2 is fixedly installed with the sleeve of the specification to be replaced, the sliding locking assembly 3 is slid upward again, and the replaceable shaft 2 is inserted into the inner hole of the sliding locking assembly 3, and the sliding locking assembly 3 is slid downward so that the lower end surface of the sliding locking assembly 3 rests on the limit surface, and the locking of the replaceable shaft 2 is completed. The impact force generated in the process of the sliding locking assembly 3 sliding upward is buffered by the first buffer assembly 4; and in the process of inserting the replaceable shaft 2, the second buffer assembly 5 will generate a buffer force in the opposite direction of the impact force during the insertion, so that the collision between the upper end surface of the replaceable shaft 2 and the contact surface is converted from a rigid collision to a flexible contact, which effectively protects the internal structure of the sleeve replacement mechanism.

[0054] In this specific embodiment, the support upper shaft 1, the replaceable shaft 2, the sliding locking assembly 3, the first buffer assembly 4 and the second buffer assembly 5 are all coaxially arranged, which ensures that the sliding of the sliding locking assembly 3 and the installation process of the replaceable shaft 2 are smoother. The first buffer assembly 4 is arranged in the internal cavity of the sliding locking assembly 3, and the second buffer assembly 5 is arranged in the cavity between the sliding locking assembly 3 and the replaceable shaft 2; the sliding locking assembly 3 is in contact with the support upper shaft 1 and the replaceable shaft 2 and is slidably connected.

[0055] The double buffer components are coaxially arranged in a concentric circle and are arranged in the cavity. During the compression and rebounding process of the buffer components, the inner cavity wall will protect and guide the buffer components, thereby ensuring the effective realization of the buffer effect.

[0056] Figure 3 is a perspective view of the sliding sleeve 31, Figure 4 is a three-dimensional schematic diagram of the sleeve 31, Figure 5 is a perspective view of the retaining sleeve 32, Figure 6 is a three-dimensional schematic diagram of the retaining sleeve 32, such as Figure 4 , Figure 5 , Figure 6As shown, the sliding locking assembly 3 includes a sliding sleeve 31, a retaining sleeve 32 and a locking member 33.

[0057] like Figure 3 , Figure 4 As shown, the upper part of the sliding sleeve 31 is provided with a buffer portion 311 for accommodating the first buffer assembly, the middle part is provided with a locking portion 312 for locking, and the lower part is provided with an unlocking portion 313; the inner hole diameter of the unlocking portion 313 is larger than the inner hole diameter of the locking portion 312;

[0058] In the locked state, the locking piece 33 is limited in the locking portion 312 and is clamped between the inner hole wall of the locking portion 312 and the outer circumference of the replaceable shaft 2; in the unlocked state, the sleeve 31 slides to the upper limit position. Since the inner hole diameter of the unlocking portion 313 is larger than the inner hole diameter of the locking portion 312, the size of the cavity between the inner hole wall of the unlocking portion 313 and the outer circumference of the replaceable shaft 2 is larger than the size of the locking piece 33, and the locking piece 33 is released from the clamped state. The locking piece 33 loses its positioning restriction and can be freely accommodated in the cavity between the inner hole wall of the unlocking portion 313 and the outer circumference of the replaceable shaft 2.

[0059] like Figure 5 , Figure 6 As shown, the diameter of the upper inner hole of the retaining sleeve 32 is larger than the diameter of the lower inner hole, a first step plane 321 is formed at the junction of the upper and lower parts, an annular positioning groove 324 is provided on the inner hole wall of the upper part, a second step surface 322 is provided on the outer peripheral surface of the retaining sleeve 32, the second step surface 322 supports the sliding sleeve 31 along the axial direction, and through holes 323 are symmetrically provided on the hole wall of the retaining sleeve 32;

[0060] The locking member 33 is spherical and is disposed in the through hole 323 when the sleeve replacement mechanism is assembled.

[0061] The first step plane 321 is used to support the axial position of the second buffer assembly 5. When the replaceable shaft 2 is taken out, the second buffer assembly 5 loses support at the lower end surface. Figure 1 The position shown slides down to the position where the positioning surface contacts the first step plane 321, and is re-positioned in the axial downward direction to prevent the second buffer assembly 5 from falling off from the installation position. The annular positioning groove 324 provided on the inner hole wall of the upper part of the retaining sleeve 32 is used to provide a limiting position for the second buffer assembly 5 in the axial upward direction.

[0062] The retaining sleeve 32 can be slidably mounted on the upper outer circumferential surface of the replaceable shaft 2, and the outer circumferential surface of the retaining sleeve 32 can be slidably and mutually contactedly mounted on the inner hole of the locking portion 313 of the sliding sleeve 31; the wall thickness of the retaining sleeve 32 is smaller than the diameter of the locking member 33; Figure 1As shown, the outer circumferential surface of the retaining sleeve as a whole is in slidable contact with the locking portion of the sliding sleeve 31 only at a position near the through hole 323. The wall thickness of the retaining sleeve 32 is smaller than the diameter of the locking member 33, which ensures that in the locked state, both sides of the locking member 33 can be exposed from the inner hole wall and the outer circumferential surface of the retaining sleeve 32, and are pressed by the locking portion 313 of the sliding sleeve 31 into the annular locking groove of the replaceable shaft 2.

[0063] In the locked state, the installation distance A between the upper end surface of the sleeve 31 and the positioning surface of the upper shaft 1 that can provide axial positioning for the sleeve 31 is greater than the diameter of the locking member 33. The distance A is the design stroke for the sleeve 31 to slide upward. The distance A is greater than the diameter of the steel ball used as the locking member 33, ensuring that when the sleeve 31 is in the unlocked position, the steel ball can be disengaged from the annular positioning groove 324 of the replaceable shaft 2 to release the positioning of the replaceable shaft 2. The first buffer component 4 is a spring;

[0064] like Fig. 9 As shown, in this specific embodiment, an internally threaded blind hole is provided on the axis center of the lower part of the supporting upper shaft 1, and positioning through holes are symmetrically provided in the radial direction of the lower outer circumference in a direction perpendicular to the axis center of the supporting upper shaft 1 and radially penetrated with the internally threaded blind hole; an annular locking groove matching the diameter of the locking piece 33 is provided in the circumferential direction of the upper outer circle of the replaceable lower shaft 2.

[0065] The second buffer assembly 5 includes a positioning sleeve 51, an elastic buffer member 52, a set screw 53, a positioning pin 54 and a force transmission member 55;

[0066] The positioning pin 54 is movably disposed in the positioning through hole, and the positioning pin 54 and the positioning through hole are arranged to be matched with a small clearance to ensure that the positioning pin 54 can move along the guiding direction of the positioning through hole when subjected to force.

[0067] like Fig. 9 , Figure 1 and Fig.12 As shown, the set screw 53 is screwed into the internal thread blind hole in a threaded manner, and a steel ball is provided as a force transmission member 55 between the upper end surface of the set screw 53 and the centripetal end of the positioning pin 54 and in contact with both of them;

[0068] The centrifugal end of the positioning pin 54 is inserted into the annular positioning groove 324 provided on the inner hole wall of the upper part of the retaining sleeve 32, so as to maintain the axial positioning of the retaining sleeve 32 and the supporting upper shaft 1;

[0069] The positioning pin 54 is installed in the positioning through hole. In this specific embodiment, three positioning pins 54 are evenly and equidistantly arranged in the circumferential direction to provide axial upward limit for the second buffer assembly 5. In use, when installing, the set screw 53 is rotated to move the set screw 53 toward the force transmission member 55 to squeeze the force transmission member 55. The steel ball as the force transmission member 55 converts the direction of the force into a force along the axial direction of the positioning pin, and the steel ball applies force to the centripetal end of the positioning pin 54, so that the positioning pin 54 moves along the guide of the positioning through hole toward the inner wall of the retaining sleeve 32, so that the centrifugal end is inserted into the annular positioning groove 324 provided on the inner hole wall of the upper part of the retaining sleeve 32, and the retaining sleeve 32 is fixedly connected to the supporting upper shaft 1.

[0070] like Figure 7 , Figure 8 and Fig. 9 As shown, in this specific embodiment, the positioning sleeve 51 and the elastic buffer 52 are arranged in the cavity formed between the supporting upper shaft 1, the replaceable lower shaft 2 and the retaining sleeve (32);

[0071] The positioning sleeve 51 has a positioning step portion 511 and a sliding portion 512 . The outer diameter of the positioning step portion 511 is matched with the upper inner hole of the retaining sleeve 32 . The outer diameter of the sliding portion 512 is matched with the lower inner hole of the retaining sleeve 32 .

[0072] After the lock of the replaceable shaft 2 is released, the lower end surface of the positioning step portion 511 contacts the first step plane 321 of the retaining sleeve 32 in a matching manner, and the positioning sleeve 51 is retained in the internal cavity of the retaining sleeve 32. The elastic buffer 52 is a spring;

[0073] like Figure 1 and Fig. 9 As shown, in the locked state, there is a safety distance B between the upper end surface of the positioning sleeve 51 and the positioning pin 54, ranging from 0.5mm to 1mm, and a buffer distance C is set between the lower end surface of the outer circle of the positioning step portion 511 and the first step plane 321.

[0074] In the unlocked state, the locking member 33 is separated from the outer circumferential surface of the replaceable shaft 2. After the replaceable shaft 2 is taken out, the distance that the positioning sleeve 51 falls is the buffer distance C. After the positioning sleeve 51 falls, the spring of the second buffer assembly 5 is in a state of small compression. When the replaceable shaft 2 is installed again, the top end surface of the replaceable shaft 2 hits the positioning sleeve 51, and the positioning sleeve 51 moves upward, compressing the spring, increasing the compression of the spring, thereby generating a larger buffer force to counteract the impact force generated when the replaceable shaft 2 is installed, so as to protect the replaceable shaft 2 and the second buffer assembly 5 and the supporting upper shaft 1.

[0075] like Fig.11 and Fig.12As shown, in a specific embodiment of the present application, an automatic sleeve replacement device is also provided, including the above-mentioned sleeve replacement mechanism, and also includes a mounting base 6, a replacement clamping mechanism and a fixed base 9 detachably fixedly connected to the sleeve replacement mechanism.

[0076] like Fig.10 and Fig.11 As shown, in this specific embodiment, in order to conveniently and quickly install or remove the replacement sleeve mechanism and the fixed base 9, a through fixing through hole is provided at a position radially passing through the axial center line of the replaceable shaft 2 in the middle part of the replaceable shaft 2, and a tightly fitting fixing column pin 91 is provided inside. The length of the fixing column pin 91 is greater than the diameter of the replaceable shaft 2 at the installation position, and the distances at both ends exceeding the outer circumference of the replaceable shaft 2 are equal;

[0077] An axial straight groove 92 is provided on the inner wall of the fixed base 9 , and an annular mounting groove 93 is provided on the inner wall intersecting with and perpendicular to the straight groove 92 . The maximum diameters of the straight groove 92 and the annular mounting groove 93 exceed the length of the fixed pin 91 .

[0078] During assembly, the fixed column pin 91 is installed into the fixed through hole at the lower part of the replaceable shaft 2, and the lengths of the two ends of the fixed column pin 91 extending out of the outer circumference of the replaceable shaft 2 are equal. The two ends of the fixed column pin 91 of the replaceable shaft 2 are aligned with the straight groove 92 in the axial direction set on the inner wall of the fixed base 9, and the replaceable shaft 2 is downwardly installed into the fixed base 9. When the fixed column pin 9 reaches the position of the annular mounting groove 93, the replaceable sleeve mechanism is rotated by a certain angle, and the replaceable sleeve mechanism can be fixed in the fixed base 9. In this specific embodiment, the fixed base 9 is divided into two parts, and the lower part of the inner hole of the upper seat is provided with an annular mounting groove 93 with a rectangular cross section, and the inner hole diameter of the lower seat is the same as that of the upper seat and is a through hole with a continuous smooth inner wall. The upper end surface of the lower seat provides an axial downward limit for the fixed column pin 91.

[0079] The replacement clamping mechanism comprises a toggle assembly 7 fixedly arranged on a mounting base plate 6 for sliding the sleeve 3 and a clamping assembly 8 for fixing the replacement sleeve mechanism in the axial direction.

[0080] In the automatic sleeve replacement device, when in use, the toggle assembly 7 and the clamping assembly 8 are both controlled by pneumatic components. Specifically, the electrical control system controls the movement of the piston rod of the cylinder to separate the clamping assembly 8 from the supporting upper shaft 1 and the toggle assembly 7 from the sliding sleeve 31, so that the sleeve replacement mechanism can be operated and fixed to the fixed base 9.

[0081] like Fig.12 As shown, in another specific embodiment, in order to ensure that the length of the fixed pin 91 extending out of the outer peripheral surface of the replaceable shaft is equal, an annular centering groove is provided in the middle of the fixed pin 91;

[0082] An internal threaded hole is provided at the center of the replaceable shaft 2 and is connected with the fixed through hole. A centering screw 94 is inserted into the internal threaded hole through the internal thread connection. The lower end of the centering screw 94 is clamped in the annular centering groove of the fixed pin 91.

[0083] In a specific embodiment of the present application, the toggle assembly 7 includes a first cylinder 71 and a clamping portion 72 fixed to the piston end of the first cylinder, and the clamping portion can contact the lower end surface of the sleeve 3 as the cylinder piston extends and push the sleeve 3 to slide upward;

[0084] The clamping assembly 8 includes a horizontally arranged second cylinder 81 and a third cylinder 82 which is perpendicular to the piston extension and retraction direction of the second cylinder 81 and moves with the piston of the second cylinder 81. A clamping part 83 is fixedly arranged on the top of the piston of the third cylinder 82. The clamping part 83 can realize top-down clamping of the sleeve replacement mechanism through the movement of the second cylinder 81 and the third cylinder 82.

[0085] In the automatic sleeve replacement device, the electrical control system controls the clamping part 83 to press the upper end surface of the supporting upper shaft 1, and fixes the sleeve replacement mechanism between the clamping part 83 and the fixed base 9. When the replaceable lower shaft 2 needs to be replaced, the electrical control system controls the piston end of the first cylinder 71 to extend, and the clamping part 72 slides the sliding sleeve 31 upward to unlock the positioning connection between the retaining sleeve 32 and the replaceable lower shaft 1.

[0086] The automatic sleeve replacement device of this specific embodiment uses pneumatic components to realize the automation of the replacement process, has a simple structure, and a controllable process.

[0087] The preferred embodiments of the present application are described in detail above; however, the present application is not limited to the specific details in the above embodiments. Within the technical concept of the present application, a variety of simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the protection scope of the present application.

[0088] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0089] In addition, the various implementation modes of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed by the present invention.

Claims

1. Replacement sleeve mechanism, characterized in that, It comprises a supporting upper shaft (1) and a replaceable lower shaft (2) which can slide relative to the supporting upper shaft (1); A sliding locking assembly (3) which is slidably disposed between the supporting upper shaft and the replaceable lower shaft, and locks or releases the positioning cooperation between the replaceable lower shaft (2) and the sliding locking assembly (3) by sliding; and A first buffer component (4) for buffering the impact force generated during locking; and A second buffer component (5) is used to buffer the impact force generated when installing the replaceable shaft (2).

2. The sleeve replacement mechanism according to claim 1, characterized in that: The supporting upper shaft (1), the replaceable lower shaft (2), the sliding locking assembly (3), the first buffer assembly (4) and the second buffer assembly (5) are all coaxially arranged; The first buffer component (4) is arranged in the inner cavity of the sliding locking component (3), and the second buffer component (5) is arranged in the cavity between the sliding locking component (3) and the replaceable shaft (2); The sliding locking assembly (3) is simultaneously in contact with the supporting upper shaft (1) and the replaceable lower shaft (2) and is slidably connected.

3. The sleeve replacement mechanism according to claim 1 or 2, characterized in that: The sliding locking assembly (3) comprises a sliding sleeve (31), a retaining sleeve (32) and a locking member (33). The upper part of the sliding sleeve (31) is provided with a buffer portion (311) for accommodating the first buffer assembly, the middle part is provided with a locking portion (312) for locking, and the lower part is provided with an unlocking portion (313); the inner hole diameter of the unlocking portion (313) is larger than the inner hole diameter of the locking portion (312); The diameter of the upper inner hole of the retaining sleeve (32) is larger than the diameter of the lower inner hole, a first step plane (321) is formed at the junction of the upper and lower parts, an annular positioning groove (324) is provided on the inner hole wall of the upper part, a second step surface (322) is provided on the outer peripheral surface of the retaining sleeve (32), the second step surface (322) supports the sliding sleeve (31) in the axial direction, and through holes (323) are symmetrically provided on the hole wall of the retaining sleeve (32); The locking member (33) is spherical and is disposed in the through hole (323); The retaining sleeve (32) can be slidably mounted on the upper outer circumferential surface of the replaceable shaft (2), and the outer circumferential surface of the retaining sleeve (32) can be slidably and mutually contactably mounted on the inner hole of the locking portion (313) of the sliding sleeve (31); The wall thickness of the retaining sleeve (32) is smaller than the diameter of the locking member (33); In the locked state, the installation distance A between the upper end surface of the sliding sleeve (31) and the positioning surface of the supporting upper shaft (1) capable of providing axial positioning for the sliding sleeve (31) is greater than the diameter of the locking member (33).

4. The sleeve replacement mechanism according to claim 3, characterized in that: The first buffer component (4) is evenly arranged between the retaining sleeve (32) and the buffer portion (311) in the circumferential direction, and the first buffer component (4) is made of elastic material; The axis center of the lower part of the supporting upper shaft (1) is provided with an internal threaded blind hole, and positioning through holes are symmetrically provided in the radial direction of the lower outer circumference in a direction perpendicular to the axis center of the supporting upper shaft (1) and radially penetrate the internal threaded blind hole; an annular locking groove matching the diameter of the locking piece (33) is provided in the circumferential direction of the upper outer circle of the replaceable lower shaft (2).

5. The sleeve replacement mechanism according to claim 4, characterized in that: The second buffer assembly (5) comprises a positioning sleeve (51), an elastic buffer member (52), a set screw (53), a positioning pin (54) and a force transmission member (55); The positioning pin (54) is movably arranged in the positioning through hole, and the positioning pin (54) and the positioning through hole are arranged to be matched with a small clearance; The set screw (53) is screwed into the internal thread blind hole in a threaded manner, and the force transmission member (55) is arranged between the upper end surface of the set screw (53) and the centripetal end of the positioning pin (54) and in contact with both of them; The centrifugal end of the positioning pin (54) is inserted into an annular positioning groove (324) provided on the inner hole wall of the upper part of the retaining sleeve (32) to maintain the axial positioning of the retaining sleeve (32) and the supporting upper shaft (1); The positioning sleeve (51) and the elastic buffer (52) are arranged in a cavity formed between the supporting upper shaft (1), the replaceable lower shaft (2) and the retaining sleeve (32); The positioning sleeve (51) comprises a positioning step portion (511) and a sliding portion (512); the outer diameter of the positioning step portion (511) is arranged to match the upper inner hole of the retaining sleeve (32); and the outer diameter of the sliding portion (512) is arranged to match the lower inner hole of the retaining sleeve (32).

6. The sleeve replacement mechanism according to claim 5, characterized in that: The elastic buffer (52) is evenly arranged in the circumferential direction between the outer wall of the supporting upper shaft (1) and the inner hole wall of the positioning sleeve (51), and the elastic buffer (52) is made of elastic material; In the locked state, a safety distance B is provided between the upper end surface of the positioning sleeve (51) and the positioning pin (54), and a buffer distance C is provided between the lower end surface of the outer circle of the positioning step portion (511) and the first step plane (321).

7. Automatic sleeve replacement device, characterized in that: It comprises the sleeve replacement mechanism as claimed in any one of claims 1 to 6, and also comprises a mounting base plate (6), a replacement clamping mechanism and a fixing base (9) detachably fixedly connected to the sleeve replacement mechanism; The replacement clamping mechanism comprises a toggle assembly (7) fixedly arranged on the mounting base plate (6) for sliding the sliding sleeve (3) and a clamping assembly (8) for fixing the replacement sleeve mechanism in the axial direction.

8. The automatic sleeve replacement device according to claim 7, characterized in that: A through-hole is provided at a position radially passing through the axis of the replaceable shaft (2) in the middle of the replaceable shaft, and a tightly fitting fixing pin (91) is provided inside the hole. The length of the fixing pin (91) is greater than the diameter of the replaceable shaft (2) at the installation position, and the distances at both ends exceeding the outer surface of the replaceable shaft (2) are equal; A straight groove (92) in an axial direction is provided on the inner wall of the fixed base (9), and an annular mounting groove (93) is provided on the inner wall to intersect with and perpendicular to the straight groove (92) in space, and the maximum diameters of the straight groove (92) and the annular mounting groove (93) exceed the length of the fixed pin (91).

9. The automatic sleeve replacement device according to claim 8, characterized in that: The fixing pin (91) is provided with an annular centering groove in the middle; An internal threaded hole is provided at the center of the replaceable shaft and is connected to the fixed through hole. A centering screw (94) is installed in the internal threaded hole through a thread connection. The lower end of the centering screw (94) is clamped in the annular centering groove of the fixed pin (91).

10. The automatic sleeve replacement device according to claim 7 or 9, characterized in that: The toggle assembly (7) comprises a first cylinder (71) and a clamping portion (72) fixed to the piston end of the first cylinder, wherein the clamping portion can contact the lower end surface of the sliding sleeve (3) and push the sliding sleeve (3) to slide upwards as the cylinder piston extends; The clamping assembly (8) comprises a second cylinder (81) arranged horizontally and a third cylinder (82) which is perpendicular to the piston extension and retraction direction of the second cylinder (81) and moves with the piston of the second cylinder (81). A clamping portion (83) is fixedly arranged on the top of the piston of the third cylinder (82). The clamping portion (83) can realize top-down clamping of the sleeve replacement mechanism through the movement of the second cylinder (81) and the third cylinder (82).

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