CN113400250B - Transmission shaft and backrest wheel separating device - Google Patents
Transmission shaft and backrest wheel separating device Download PDFInfo
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- CN113400250B CN113400250B CN202110682679.7A CN202110682679A CN113400250B CN 113400250 B CN113400250 B CN 113400250B CN 202110682679 A CN202110682679 A CN 202110682679A CN 113400250 B CN113400250 B CN 113400250B
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- nut
- transmission shaft
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- backrest wheel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
- B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
- B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
- B25B27/06—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting or withdrawing sleeves or bearing races
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/56—Reuse, recycling or recovery technologies of vehicles
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chairs For Special Purposes, Such As Reclining Chairs (AREA)
Abstract
The invention discloses a transmission shaft and backrest wheel separating device, which comprises a power assembly, a driving assembly and a backrest wheel, wherein the power assembly comprises power, a transmission shaft and a backrest wheel; the splitting assembly comprises a supporting steel plate and a jack, wherein one end of the jack is contacted with the supporting steel plate, and the other end of the jack is contacted with the transmission shaft; the connecting piece comprises a middle piece, a first connecting group and a second connecting group, wherein the first connecting group is connected with the middle piece and the backrest wheel, and the second connecting group is connected with the middle piece and the supporting steel plate; according to the invention, under the condition that the distance between the backrest wheel and the supporting steel plate is unchanged, the backrest wheel can be separated from the shaft along with the lengthening of the jack piston; the three-jaw pulling horse is prevented from being used improperly, personnel are injured, time is saved for disassembling the backrest wheel, the disassembly of the backrest wheel can be completed by a single person, labor is saved, the special tool is firm and reliable, the force is balanced, and equipment damage cannot be caused.
Description
Technical Field
The invention relates to the technical field of disassembly of transmission shafts, in particular to a device for separating a transmission shaft from a backrest wheel.
Background
When the damaged bearing is required to be detached from the pump shaft, a three-jaw puller is often used for detaching, the three-jaw puller is usually composed of a rotary handle, a screw rod and a pull jaw, and when the three-jaw puller is used, the screw rod head is positioned in a shaft end tip hole to enable the pull jaw to be hooked on the outer ring of the bearing, and the rotary handle is rotated to enable the pull jaw to drive the bearing to move outwards along the axial direction, so that the bearing can be detached.
When the backrest wheel on the transmission shaft is disassembled, the three-jaw puller is also utilized, but because the backrest wheel is generally large in size, the three puller jaws cannot be hooked well when being contacted with the backrest wheel, and 3-4 persons are usually required to cooperate, so that the backrest wheel can be disassembled with even force. If the operation is improper, the pulling claw can be damaged, and personnel are injured. For example, when the three claws are not symmetrical, the backrest wheel is disassembled, so that the pump shaft can be pulled or auxiliary personnel can be injured. Therefore, it is not suitable to disassemble the pump shaft back wheel by using the three-jaw puller.
Disclosure of Invention
This section is intended to summarize some aspects of embodiments of the invention and to briefly introduce some preferred embodiments, which may be simplified or omitted from the present section and description abstract and title of the application to avoid obscuring the objects of this section, description abstract and title, and which is not intended to limit the scope of this invention.
The present invention has been made in view of the above and/or problems occurring in the prior art.
Therefore, the technical problem to be solved by the invention is that the traditional three-jaw puller is complex and laborious to operate in a mode of disassembling the transmission shaft and the backrest wheel, and the problem of safety risk exists.
In order to solve the technical problems, the invention provides the following technical scheme: a device for separating a transmission shaft from a backrest wheel comprises,
the power assembly comprises power, a transmission shaft and a backrest wheel, wherein the transmission shaft is connected with the power, and the backrest wheel is connected with the transmission shaft through a key;
the splitting assembly comprises a supporting steel plate and a jack, wherein one end of the jack is contacted with the supporting steel plate, and the other end of the jack is contacted with the transmission shaft;
the connecting piece comprises a middle piece, a first connecting group and a second connecting group, wherein the first connecting group is connected with the middle piece and the backrest wheel, and the second connecting group is connected with the middle piece and the supporting steel plate.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: the first connecting group comprises a first bolt and a first nut, and the first nut is arranged in the middle piece;
the backrest wheel is provided with a first hole, and the first bolt penetrates through the first hole to be connected with the first nut.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: the second connecting group comprises a second bolt and a second nut, and the second nut is arranged in the middle piece; the method comprises the steps of carrying out a first treatment on the surface of the
The support steel plate is provided with a second hole, and the first bolt and the second bolt penetrate through the second hole to be connected with the second nut.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: the bottom end of the jack is contacted with the supporting steel plate, and the rod end is contacted with the end part of the transmission shaft.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: and a cushion block is arranged between the bottom end of the jack and the supporting steel plate.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: a first accommodating groove and a second accommodating groove are formed in the middle piece, the first accommodating groove and the second accommodating groove are respectively formed in two ends of the connecting piece, the first nut is arranged in the first accommodating groove, and the second nut is arranged in the second accommodating groove;
as a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: the first accommodating groove comprises an outer groove and an inner groove, the section of the outer groove is regular hexagon, the section of the inner groove is circular, and the section area of the inner groove is larger than that of the outer groove.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: a circular plate is arranged in the inner groove, and one side of the circular plate is connected with the bottom of the inner groove through a spring.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: a slot hole is formed in the center of the circular plate, the slot hole is of a regular hexagon, and the slot hole is matched with the outer slot in size;
the slotted holes are staggered with the outer slots.
As a preferable mode of the separation device of the transmission shaft and the backrest wheel, the invention comprises the following steps: a first slot is arranged in the outer slot, a first opening is arranged on the middle piece, and the first opening is correspondingly arranged and communicated with the first slot;
the section of the second accommodating groove is regular hexagon, a second slot is arranged in the second accommodating groove, a second opening is further formed in the middle piece, and the second opening is correspondingly arranged and communicated with the second slot.
The invention has the beneficial effects that: according to the invention, under the condition that the distance between the backrest wheel and the supporting steel plate is unchanged, the backrest wheel can be separated from the shaft along with the lengthening of the jack piston; the three-jaw pulling horse is prevented from being used improperly, personnel are injured, time is saved for disassembling the backrest wheel, the disassembly of the backrest wheel can be completed by a single person, labor is saved, the special tool is firm and reliable, the force is balanced, and equipment damage cannot be caused.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic view of the overall assembly of a transmission shaft and back wheel separator according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of a connecting member of a device for separating a transmission shaft from a back wheel according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a first slot in a device for separating a transmission shaft from a backrest wheel according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an internal structure of an intermediate member in a device for separating a transmission shaft from a backrest wheel according to an embodiment of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
In the following detailed description of the embodiments of the present invention, reference is made to the accompanying drawings, which form a part hereof, and in which are shown by way of illustration only, and in which is shown by way of illustration only, and in which the scope of the invention is not limited for ease of illustration. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Further still, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic may be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Example 1
Referring to fig. 1 to 4, the present embodiment provides a transmission shaft and back wheel separating apparatus, comprising,
the power assembly 100 comprises a driving piece 101, a transmission shaft 102 and a backrest wheel 103, wherein the transmission shaft 102 is connected with the driving piece 101, and the backrest wheel 103 is connected with the transmission shaft 102 in a key way;
the splitting assembly 200 comprises a supporting steel plate 201 and a jack 202, wherein one end of the jack 202 is contacted with the supporting steel plate 201, and the other end is contacted with the transmission shaft 102;
the connecting member 300 includes a middle member 400, a first connecting group 301 and a second connecting group 302, the first connecting group 301 connecting the middle member 400 and the back wheel 103, and the second connecting group 302 connecting the middle member 400 and the supporting steel plate 201.
The first connection group 301 includes a first bolt 301a and a first nut 301b, the first nut 301b being disposed in the intermediate 400;
the back wheel 103 is provided with a first hole 103a, and a first bolt 301a is connected to a first nut 301b through the first hole 103 a.
It should be noted that the first holes 103a are symmetrically arranged holes, at least two of which are provided.
The second connection set 302 includes a second bolt 302a and a second nut 302b, the second nut 302b being disposed in the intermediate piece 400; the method comprises the steps of carrying out a first treatment on the surface of the
The support steel plate 201 is provided with a second hole 201a, and a second bolt 302a is coupled to a second nut 302b through the second hole 201 a.
The second holes 201a are at least two holes symmetrically arranged, the positions of the second holes correspond to the first holes 103a, the first bolts 301a and the second bolts 302a are special bolts matched with the backrest wheel, the driving piece 101 is a motor or a pump, the first bolts 301a penetrate into the two first holes 103a on the backrest wheel 103 from the side of the motor or the pump outwards diagonally, the other ends of the first bolts 301a are connected with the first nuts 301b, and the screwing depth is the depth of a single nut; similarly, the second bolts 302a pass through two second holes 201a in the support steel plate 201, and the other ends are connected to the second nuts 302b, and the intermediate member 400 fixes the second nuts 302b and the first nuts 301b together.
The bottom end of the jack 202 is contacted with the supporting steel plate 201, and the rod end is contacted with the end of the transmission shaft 102; a cushion block is arranged between the bottom end of the jack 202 and the supporting steel plate 201.
It should be noted that, the center of the supporting steel plate 201 is provided with a circular groove, a jack with a proper length is selected, the base of the jack is attached to the circular groove on the supporting steel plate 201, the jack is pressurized, the piston rod of the jack is lifted, the end face of the transmission shaft is just propped against, and at the moment, the special tool and the backrest wheel are in a tightening state.
In the process of gradually pressing the jack, the backrest wheel is completely separated from the transmission shaft (if the jack piston is completely pushed out in the process, the backrest wheel is still in partial contact with the shaft, the jack can be loosened, and the jack base is disassembled by a cushion block adding method.
Further, a first accommodating groove 401 and a second accommodating groove 402 are formed in the intermediate member 400, the first accommodating groove 401 and the second accommodating groove 402 are respectively formed at two ends of the connecting member 100, the first nut 301b is formed in the first accommodating groove 01, and the second nut 302a is formed in the second accommodating groove 402;
preferably, the middle member 400 is integrally hexagonal.
It should be noted that the backrest wheel 103 and the supporting steel plate 201 have two plate structures to be fixed, specifically, holes are formed on the two plate structures, and the first bolt 301a and the second bolt 302b are connected to the first nut 301b and the second nut 302a respectively through the holes on the plates.
The intermediate member 400 is provided between the back wheel 103 and the support steel plate 201, and the intermediate member 400 is provided between the back wheel 103 and the support steel plate 201 with the first bolt 301a and the second bolt 302a therebetween, so that the distance between the back wheel 103 and the support steel plate 201 is fixed.
Specifically, the final distance between the back wheel 103 and the support steel plate 201 is determined by the jack 202, and the two ends of the jack 202 are pressed against the back wheel 103 and the support steel plate 201, and specifically, the piston rod end of the jack 202 is pressed against the transmission shaft 102.
The first bolt 301a and the second bolt 302b are oppositely arranged, in the process that the first bolt 301a and the second bolt 302b are respectively connected with the first nut 301b and the second nut 302a in a screwing way, the first bolt 301a and the second bolt 302b respectively drive the backrest wheel 103 and the supporting steel plate 201 to be close to the middle, the backrest wheel 103 and the supporting steel plate 201 are finally propped against the jack 202, and finally the force of the jack 202 on the backrest wheel 103 and the supporting steel plate 201 is balanced with the inward tightening force of the first bolt 301a and the second bolt 302b on the backrest wheel 103 and the supporting steel plate 201.
In the disassembly process, the piston rod of the jack 202 is lifted, and the inward tightening force of the first bolt 301a and the second bolt 302b on the backrest wheel 103 and the supporting steel plate 201 is opposite to the outward pushing force of the jack 202, so that the jack 202 pushes the transmission shaft 102 out of the backrest wheel 103 under the condition that the distance between the backrest wheel 103 and the supporting steel plate 201 is kept unchanged.
Further, the first accommodating groove 401 includes an outer groove 401a and an inner groove 401b, the outer groove 401a has a regular hexagon in cross section, the inner groove 401b has a circular cross section, and the inner groove 401b has a larger cross section area than the outer groove 401a; a circular plate 401c is provided in the inner groove 401b, and one side of the circular plate 401c is connected to the bottom of the inner groove 401b by a spring 401 d.
A slot 401e is arranged in the center of the circular plate 401c, the slot 401e is in a regular hexagon shape, and the slot 401e is matched with the outer slot 401a in size.
The slot 401e and the outer slot 401a are staggered, specifically, referring to two corresponding lines A, B in fig. 4, the first nut 301b is embedded in the outer slot 401a, the hexagonal position of the outer slot 401a does not correspond to the hexagonal position of the slot 401e, so that the first nut 301b moving in the inner slot 401b in the outer slot 401a pushes the circular plate 401c to move instead of passing through the slot 401e, and after the first nut 301b completely enters the inner slot 401b, the first nut 301b is rotated until the hexagonal position of the first nut 301b corresponds to the hexagonal position of the slot 401e, so that the first nut 301b can pass through the slot 401e and can be rotated at will.
It should be noted that the depth of the inner groove 401b is greater than the thickness of the first nut 301b, and the spring 401d does not affect the rotation of the first nut 301 b.
A first slot 401f is arranged in the outer slot 401a, a first opening 401g is arranged on the middleware 400, and the first opening 401g is correspondingly arranged and communicated with the first slot 401 f; the section of the second accommodating groove 402 is regular hexagon, a second slot 402a is arranged in the second accommodating groove 402, a second opening 402b is further arranged on the intermediate piece 400, and the second opening 402b is correspondingly arranged and communicated with the second slot 402 a.
The baffle 500 is also included, and one end of the baffle 500 has the same shape as the first slot 401f and the second slot 402 a; the baffle 500 is provided with a circular hole 501.
The circular hole 501 is used to pass the bolt, and the baffle 500 may restrict the first nut 301b in the first receiving groove 01 and the second nut 302a in the second receiving groove 402.
The baffle 500 can be inserted into the first slot 401f from the first opening 401g, and the round hole 501 is coaxial with the circular plate 401 c; a pull hole 502 is formed in the baffle 500 near the edge; the pulling holes 502 facilitate removal of the baffle 500 from the first opening 401 g.
Specifically, during use, the first nut 301b is placed in the outer groove 401a, and the spring 401d abuts the circular plate 401c against the transition between the outer groove 401a and the inner groove 401b, and the groove hole 401e is offset from the outer groove 401a, so that the first nut 301b is blocked by the circular plate 401c from entering the inner groove 401b.
The shutter 500 is then inserted into the first slot 401f from the first opening 401g, the end of the shutter 500 is inserted into the first slot 401f, and the first bolt 301a connected to the back wheel 103 is screwed into the first nut 301b through the circular hole 501, and in this process, the intermediate member 400 rotates synchronously with the first nut 301b with respect to the first bolt 301a due to the first nut 301b being inserted into the outer slot 401 a.
It should be noted that the first nut 301b is sized to mate with the outer groove 401 a.
Preferably, the first bolt 301a cannot rotate along its own axis, and in particular, a wrench or other tool is used to limit the first bolt 301a, the first bolt 301a cannot rotate, and it is convenient to hold the intermediate member 400 to rotate the first nut 301b onto the first bolt 301 a.
Subsequently, the support steel plate 201 to which the second bolts 302b are attached is disposed with respect to the back wheel 103, and the jack 202 is disposed at a proper position between the back wheel 103 and the support steel plate 201, it should be noted that the second bolts 302b cannot rotate with respect to the support steel plate 201 either.
Subsequently, the first nut 301b is moved into the inner groove 401b, the pushing disc 401c is moved into the inner groove 401b, the spring 401d is compressed, and the first nut 301b can be rotated with respect to the intermediate member 400 after the first nut 301b is completely inserted into the inner groove 401b.
At this time, the other baffle 500 is inserted into the second slot 402a from the second opening 402b, the second bolt 302b is screwed with the second nut 302a through the round hole 501, and the rotating intermediate member 400 rotates relative to the first nut 301b, that is, the first nut 301b is fixed with the first bolt 301 a; the second nut 302a is engaged with the second receiving groove 402, so that the second nut 302a rotates to screw the second bolt 302b into the second nut 302a, and the supporting steel plate 201 and the second bolt 302b are pulled together toward the intermediate member 400, thereby shortening the distance between the backrest wheel 103 and the supporting steel plate 201. Again under the constraints of jack 202, its distance remains fixed.
It is important to note that the construction and arrangement of the present application as shown in a variety of different exemplary embodiments is illustrative only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of present invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operating conditions and arrangement of the exemplary embodiments without departing from the scope of the present inventions. Therefore, the invention is not limited to the specific embodiments, but extends to various modifications that nevertheless fall within the scope of the appended claims.
Furthermore, in an effort to provide a concise description of the exemplary embodiments, all features of an actual implementation may not be described (i.e., those not associated with the best mode presently contemplated for carrying out the invention, or those not associated with practicing the invention).
It should be appreciated that in the development of any such actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort might be complex and time consuming, but would nevertheless be a routine undertaking of design, fabrication, and manufacture for those of ordinary skill having the benefit of this disclosure.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (1)
1. A transmission shaft and backrest wheel separator, its characterized in that: comprising the steps of (a) a step of,
the power assembly (100) comprises a driving piece (101), a transmission shaft (102) and a backrest wheel (103), wherein the transmission shaft (102) is connected with the driving piece (101), and the backrest wheel (103) is connected with the transmission shaft (102) in a key way;
the split assembly (200) comprises a supporting steel plate (201) and a jack (202), wherein one end of the jack (202) is contacted with the supporting steel plate (201) while the other end is contacted with the transmission shaft (102);
the connecting piece (300) comprises a middle piece (400), a first connecting group (301) and a second connecting group (302), wherein the first connecting group (301) is used for connecting the middle piece (400) and the backrest wheel (103), and the second connecting group (302) is used for connecting the middle piece (400) and the supporting steel plate (201);
the first connection group (301) comprises a first bolt (301 a) and a first nut (301 b), the first nut (301 b) being arranged in the intermediate piece (400);
the backrest wheel (103) is provided with a first hole (103 a), and the first bolt (301 a) passes through the first hole (103 a) to be connected with the first nut (301 b);
the second connection group (302) comprises a second bolt (302 a) and a second nut (302 b), the second nut (302 b) being arranged in the intermediate piece (400);
a second hole (201 a) is formed in the support steel plate (201), and the second bolt (302 a) penetrates through the second hole (201 a) and is connected with the second nut (302 b);
the bottom end of the jack (202) is contacted with the supporting steel plate (201), and the rod end is contacted with the end part of the transmission shaft (102);
a cushion block is arranged between the bottom end of the jack (202) and the supporting steel plate (201);
a first accommodating groove (401) and a second accommodating groove (402) are formed in the middle piece (400), the first accommodating groove (401) and the second accommodating groove (402) are respectively formed in two ends of the connecting piece (300), the first nut (301 b) is arranged in the first accommodating groove (01), and the second nut (302 b) is arranged in the second accommodating groove (402);
the first accommodating groove (401) comprises an outer groove (401 a) and an inner groove (401 b), the cross section of the outer groove (401 a) is regular hexagon, the cross section of the inner groove (401 b) is circular, and the cross section area of the inner groove (401 b) is larger than that of the outer groove (401 a);
a circular plate (401 c) is arranged in the inner groove (401 b), and one side of the circular plate (401 c) is connected with the bottom of the inner groove (401 b) through a spring (401 d);
a slot hole (401 e) is formed in the center of the circular plate (401 c), the slot hole (401 e) is in a regular hexagon shape, and the slot hole (401 e) is matched with the outer slot (401 a) in size;
the slot holes (401 e) and the outer slots (401 a) are staggered,
a first slot (401 f) is arranged in the outer slot (401 a), a first opening (401 g) is arranged on the middle piece (400), and the first opening (401 g) is correspondingly arranged and communicated with the first slot (401 f);
the section of the second accommodating groove (402) is regular hexagon, a second slot (402 a) is arranged in the second accommodating groove (402), a second opening (402 b) is further arranged on the middle piece (400), and the second opening (402 b) and the second slot (402 a) are correspondingly arranged and communicated.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110682679.7A CN113400250B (en) | 2021-06-21 | 2021-06-21 | Transmission shaft and backrest wheel separating device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110682679.7A CN113400250B (en) | 2021-06-21 | 2021-06-21 | Transmission shaft and backrest wheel separating device |
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|---|---|
| CN113400250A (en) | 2021-09-17 |
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