Quick change device for removable back panel

Abstract

The application discloses a detachable rear protective sheet quick exchange device, which comprises a rear protective sheet, a front clamping piece and a rear clamping piece extending downward from the bottom end of the rear protective sheet, the front clamping piece and the rear clamping piece can be mutually contracted and matched to be clamped at the position of the shoe body heel, through holes are respectively penetrated in the front clamping piece and the rear clamping piece, a connecting bolt is arranged in the through hole, a connecting buckle is arranged on the front clamping piece, a contraction structure allowing the connecting buckle to move along the connecting bolt is arranged on the connecting bolt, a folding handle is arranged at one end of the connecting bolt, and a locking piece capable of locking the rotation of the connecting bolt is arranged on the rear clamping piece. The application aims to provide a rear protective sheet quick exchange device which can be quickly detachably installed on the shoe body heel when the players and the goalkeeper of the ice hockey are on duty, and different ice hockey shoes are not needed to be replaced.

Description

Technical Field

[0001] This invention relates to the field of skating shoes, and more particularly to a device for quick interchange of a detachable rear shield. Background Technology

[0002] Ice hockey is an intense, fast-paced, and highly technical sport, characterized by strong competitiveness and teamwork. It tests not only individual player skill and physical abilities but also requires excellent teamwork and coordination. Ice hockey's fast pace and exciting gameplay attract a large following of fans and sports enthusiasts. The basic techniques of ice hockey include skating and running, as well as offensive and defensive techniques similar to those in football. Skating is the most fundamental technique that ice hockey players must master, including starting, forward skating, backward skating, inertial turns, step turns, and sudden stops, as well as the goalie's special skating techniques. Ice hockey equipment includes: ice hockey skates, ice hockey blades, protective gear, and ice hockey sticks. Among these, ice hockey skates play a crucial role in protecting the athlete. In ice hockey, players frequently perform rapid turns, accelerations, and stops, placing high demands on ankle stability and support. Ice hockey skates are designed with special ankle support structures, such as heel counters and ankle pads, to provide additional support and reduce the risk of ankle injuries. Therefore, suitable ice hockey skates are essential for ice hockey players. In this situation, a suitable pair of hockey skates is especially important. Whether the skates fit well and whether the friction is comfortable directly affects a player's performance. For top players, the sensitivity of their feet is no less than that of their hands; they can even feel if someone else has worn their skates.

[0003] During team training, players rotate according to different training programs and goals. For example, in technical training, players might take turns practicing passing, shooting, dribbling, etc., to improve their various technical skills. In tactical training, players might rotate based on position and tactical requirements to familiarize themselves with different positions and tactical systems. Goalkeepers also rotate in training. The purpose of goalkeeper rotation is to ensure that each goalkeeper has the opportunity to receive specialized goalkeeping training, ensuring that all team members receive equal opportunities and sufficient training to improve the overall strength and competitiveness of the team. However, since goalkeepers and players wear different hockey skates, goalkeeper skates have a short, flat blade with multiple connections between the blade and the base to prevent the puck from slipping through. Many existing hockey skates have a structure that allows for quick blade changes, so the rotation between goalkeepers and players can be achieved by changing the skates. However, because players frequently need to perform actions like skating backwards, their hockey skates have a heel protector attached to the top of the upper. This heel protector serves two purposes: firstly, it better protects the player's ankles and tendons; secondly, it provides support for the foot when the player skating backwards and pulling their leg back. Goalkeepers, on the other hand, need to move quickly and agilely to react quickly and prevent shots from going in. Therefore, goalkeeper skates are typically more flexible and agile than player skates. Goalkeeper skates prioritize better ankle flexibility and are lighter, allowing for quick movement and saves around the goal. Therefore, goalkeeper skates do not have a heel protector. Since the heel protectors on existing hockey skates are sewn onto the upper, when a player rotates to the goalkeeper position, or when a goalkeeper rotates, the rotating player needs to change skates, which is time-consuming and increases equipment costs.

[0004] Therefore, the connection of the heel protector in existing ice hockey skates needs further optimization and improvement. Summary of the Invention

[0005] The purpose of this invention is to provide a device for quick interchange of detachable rear guard plates during player and goalkeeper rotation.

[0006] To achieve the above objectives, the present invention employs the following solution: a detachable heel guard quick-change device, comprising a heel guard, with a front clip and a rear clip extending downward from the bottom end of the heel guard. The front clip and the rear clip can retract and engage to clamp the heel guard at the top of the shoe upper. Through holes are respectively passed through the front clip and the rear clip, and rotatable connecting bolts are inserted into the two through holes. A connecting buckle is provided on the front clip and movably fitted onto the connecting bolt. The connecting bolt has a retractable structure that allows the connecting buckle to move along the connecting bolt when the connecting bolt rotates. A folding handle is provided at the end of the connecting bolt outside the rear clip, capable of driving the connecting bolt to rotate. A locking member is provided on the rear clip to prevent the connecting bolt from rotating. The locking member, in conjunction with the connecting bolt, firmly clamps the front clip and the rear clip onto the heel of the shoe, enhancing the safety of athletes during intense and fast-paced ice hockey play, and allowing players and goalkeepers to rotate without needing to change to other ice hockey skates.

[0007] As a preferred embodiment of the present invention, an installation groove is provided through the heel of the shoe body at the top of the shoe upper, and the two through holes are respectively corresponding to the installation groove and connected to each other. The inner sidewalls of the front clip and the rear clip are provided with friction textures that can contact the front and rear sides of the heel of the shoe body respectively.

[0008] As a further embodiment of the present invention, an annular toothed groove is provided on the outer circumference of the connecting bolt, and the locking member includes a locking plate that can move up and down and is provided on the inner side wall of the rear clamp piece. The bottom of the locking plate is provided with a locking tooth that can be inserted into the annular toothed groove, and the locking member is provided with a latch that can lock the locking plate on the inner side wall of the rear clamp piece and prevent it from moving up and down when the locking tooth is inserted into the annular toothed groove.

[0009] As a preferred embodiment of the present invention, the shrinking structure includes at least one oblique spiral groove disposed on the outer circumference of the connecting bolt located at the front end of the annular toothed groove. The starting point of the oblique spiral groove is located at the end of the connecting bolt away from the folding handle, and the ending point of the oblique spiral groove is located at the end of the connecting bolt near the annular toothed groove. The oblique spiral groove rotates less than one revolution along the outer circumference of the connecting bolt. The inner wall of the connecting buckle is provided with a protrusion that can be embedded in the corresponding oblique spiral groove and can move along the corresponding oblique spiral groove. The large-pitch oblique spiral groove allows the connecting bolt to move quickly along the connecting bolt axis without rotating it multiple times, making the disassembly and assembly of the retaining plate quicker.

[0010] As a preferred embodiment of the present invention, a hexagonal countersunk hole coaxial with the through hole is provided on the front side wall of the front clip. The connecting buckle includes a hexagonal piece embedded in the hexagonal countersunk hole. A connecting post extends from the center of one side of the hexagonal piece. A sleeve hole is formed through the axis of the hexagonal piece and the connecting post. The end of the connecting bolt away from the folding handle passes through the sleeve hole. The protrusion is formed on the inner wall of the sleeve hole.

[0011] As a preferred embodiment of the present invention, the folding handle includes a connector fixedly disposed at one end of the connecting bolt located outside the rear clip, the diameter of the connector being larger than the diameter of the through hole, and a torsion ring that can be flipped is hinged to the connector.

[0012] As a preferred embodiment of the present invention, the torsion ring is semi-circularly hinged to the outer circumference of the connector, and an inner groove is provided along the outer circumference of the connector. A protrusion that can be embedded in the inner groove is provided on the inner wall of the torsion ring, and the cross-sections of the inner groove and the protrusion are both semi-circular.

[0013] As a preferred embodiment of the present invention, a receiving groove is provided on the inner side wall of the rear clip, and an opening communicating with the top of the receiving groove is provided on the outer side wall of the rear clip. The locking plate is movably received in the receiving groove, and a trapezoidal guide groove is provided in the receiving groove. A trapezoidal guide block that can be embedded in the guide groove and slide up and down along the guide groove is fixedly provided on the locking plate.

[0014] As a preferred embodiment of the present invention, the latch includes a positioning hole provided on the outer side wall of the rear clip, and the top of the locking plate is provided with a spring piece that can extend from the opening and extend downward along the outer side wall of the rear clip, and the spring piece is provided with a buckle that can be engaged in the positioning hole.

[0015] As a preferred embodiment of the present invention, elastic arms capable of pressing against the inner wall of the top of the receiving groove are symmetrically provided on the shoulder of the locking plate.

[0016] In summary, the advantages of this invention compared to existing technologies are as follows: This invention uses a front and rear clip that retract and engage to hold the rear protective plate at the top of the shoe upper at the heel. A connecting bolt inserted into a through-hole is twisted, allowing the connecting buckle on the front clip to move rapidly along a helical groove. A locking plate that can move up and down, with an annular toothed groove at its bottom that can be inserted into the connecting bolt, locks the bolt in place, preventing it from rotating. This achieves the effect of quickly and detachably installing the rear protective plate onto the heel of the shoe. When ice hockey players and goalkeepers rotate, only one pair of regular ice hockey skates is needed. In addition to the standard function of changing skates, the skates worn by players and goalkeepers can also quickly remove and install the rear protective plate without needing to change to different skates. This effectively saves on the cost of ice hockey skates. Attached Figure Description

[0017] Figure 1 This is a perspective view of the back of the invention when it is installed on an ice hockey skate.

[0018] Figure 2 This is a perspective view of the front of the invention when it is installed on an ice hockey skate.

[0019] Figure 3 This is one of the cross-sectional views of the present invention, and an enlarged view of a partial area in the figure.

[0020] Figure 4 This is a second cross-sectional view of the present invention, and an enlarged view of a partial area in the figure.

[0021] Figure 5 This is the third cross-sectional view of the present invention, and an enlarged view of a partial area in the figure.

[0022] Figure 6 This is the fourth cross-sectional view of the present invention, and an enlarged view of a partial area in the figure.

[0023] Figure 7 This is the fifth cross-sectional view of the present invention, and an enlarged view of a partial area in the figure.

[0024] Figure 8 This is one of the exploded views of the present invention.

[0025] Figure 9 This is a second exploded view of the present invention, and an enlarged view of a local area in the figure.

[0026] Figure 10 This is a perspective view of the connecting buckle on the connecting bolt and the locking plate in this invention.

[0027] Figure 11 This is a perspective view of the connecting buckle in this invention.

[0028] Figure 12 This is a perspective view of the connecting bolt in this invention.

[0029] Figure 13 for Figure 8 Enlarged view of point A in the middle.

[0030] Figure 14 This is a schematic diagram showing the angle between the inclined spiral groove and the axis of the connecting bolt in this invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Rear guard plate; 2. Front clip plate; 3. Rear clip plate; 4. Connecting bolt; 5. Connecting buckle; 6. Retractable structure; 7. Folding handle; 8. Locking element; 9. Locking buckle; 10. Shoe body; 11. Mounting groove; 12. Friction texture; 13. Clamp; 14. Slot; 21. Hexagonal countersunk hole; 22. Hexagonal plate; 23. Connecting post; 24. Sleeve hole; 30. Through hole; 31. Receiving groove; 32. Opening; 33. Guide groove; 41. Annular toothed groove; 60. Drive section; 61. Oblique spiral groove; 62. Protrusion; 71. Connector head; 72. Torsion ring; 73. Inner groove; 74. Protrusion; 80. Locking section; 81. Locking plate; 82. Locking tooth; 83. Trapezoidal guide block; 84. Elastic arm; 85. Semi-circular groove; 91. Positioning hole; 92. Spring clip; 93. Buckle. Detailed Implementation

[0032] The following detailed description provides various embodiments or examples for carrying out the present invention. Of course, these are merely embodiments or examples and are not intended to be limiting. Additionally, repeated reference numerals, such as repeated numbers and / or letters, may be used in different embodiments. These repetitions are for the purpose of simple and clear description of the invention and do not represent a specific relationship between the different embodiments and / or structures discussed.

[0033] Furthermore, spatial terms may be used, such as "below," "lower," "from the inside out," "above," "upper," and similar terms. These relational terms are used to facilitate the description of the relationship between some elements or features in the drawings and other elements or features. These spatial relational terms include different orientations of the device in use or operation, as well as the orientations described in the drawings. The device may be rotated 90 degrees or otherwise to different orientations, and the spatially related adjectives used therein can be interpreted in the same way. Therefore, they should not be construed as limiting the invention. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature.

[0034] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: Figures 1 to 14The device shown is a detachable heel protector quick-change device, including a shoe body 10 and a heel protector 1. A front clip 2 and a rear clip 3 extend downward from the bottom end of the heel protector 1. The top of the heel of the shoe body 10 is inserted between the front clip 2 and the rear clip 3. The front clip 2 and the rear clip 3 can retract and cooperate to clamp the heel protector 1 at the top of the shoe upper. The front clip 2 and the rear clip 3 are respectively provided with interconnected through holes 30. The heel of the shoe body 10 at the top of the shoe upper is provided with an installation groove 11. The two through holes 30 correspond to the installation groove 11 respectively and are interconnected. The inner sidewalls of the front clip 2 and the rear clip 3 facing each other are provided with friction textures 12 that can contact the front and rear sides of the heel of the shoe body 10 respectively. A rotatable connecting bolt 4 is inserted into the two through holes 30. The connecting bolt 4 passes through the through hole 30 of the rear clamp 3, passes through the mounting groove 11, and extends into the through hole 30 of the front clamp 2. A connecting buckle 5 is provided on the front clamp 2, which can be movably sleeved on the connecting bolt 4. A retractable structure 6 is provided on the connecting bolt 4, which allows the connecting buckle 5 to move along the connecting bolt 4 when the connecting bolt 4 rotates. A folding handle 7 is provided at the end of the connecting bolt 4 located outside the rear clamp 3, which can drive the connecting bolt 4 to rotate. A locking member 8 is provided on the rear clamp 3, which can lock the rotation of the connecting bolt 4. When installing the rear protector 1, after unlocking the connecting bolt 4 through the locking member 8, twist the folding handle 7 to rotate the connecting bolt 4 in the through hole 30, quickly pull the connecting buckle 5 closer, and at the same time move the front clip 2 and the rear clip 3 in opposite directions to clamp the heel of the shoe body 10. In this embodiment, the friction texture 12 adopts multiple horizontally spaced teeth, which makes it easy to firmly bite into the side wall of the heel of the shoe body 10, preventing the rear protector 1 from falling off the heel of the shoe body 10 due to the upward pulling force. When removing the rear protector 1, it is also necessary to first unlock the connecting bolt 4 through the locking member 8, then twist the folding handle 7 in the opposite direction to rotate the connecting bolt 4 in the through hole 3, so that the connecting buckle 5 moves along the connecting bolt 4 towards the toe of the shoe body 10, thereby moving the front clip 2 and the rear clip 3 in opposite directions. The front clip 2 and the rear clip 3 are released from the position of the heel of the shoe body 10 at the top of the shoe upper, completing the removal of the rear protector 1.

[0035] Among them, such as Figures 3 to 14As shown, a groove 14 is provided around the outer circumference of the connecting bolt 4. A clamp 13 is fitted inside the groove 14 to prevent the connecting bolt 4 from disengaging from the through hole 3. In this embodiment, the groove 14 divides the connecting bolt 4 into front and rear sections. An annular toothed groove 41 is provided around the outer circumference of the connecting bolt 4 near the folding handle 7. A receiving groove 31 is provided on the inner side wall of the rear clip 3. The locking member 8 includes a locking plate 81 that can move up and down and is received in the receiving groove 31. A trapezoidal guide groove 33 is provided in the receiving groove 31. A trapezoidal guide block 83 that can be embedded in the guide groove 33 and slide up and down along the guide groove 33 is fixed on the locking plate 81. The bottom of the locking plate 81 is provided with a locking tooth 82 that can be inserted into the annular toothed groove 41. In this embodiment, a semi-circular groove 85 is provided at the bottom of the locking plate 81. The semi-circular groove 85 can be locked onto the outer circumference of the connecting bolt 4. The locking tooth 82 protrudes from the top of the semi-circular groove 85. It should also be noted that the width of the annular toothed groove 41 is greater than the width of the locking tooth 82 so that the locking tooth 82 can be better inserted into the annular toothed groove 41. The locking member 8 is provided with a latch 9 that locks the locking plate 81 onto the inner side wall of the rear clamp 3 and prevents it from moving up and down when the locking tooth 82 is inserted into the annular toothed groove 41. Specifically: the outer side wall of the rear clip 3 is provided with an opening 32 that communicates with the top of the receiving groove 31; the latch 9 includes a positioning hole 91 provided on the outer side wall of the rear clip 3; the top of the locking plate 81 is provided with a spring piece 92 that can extend out from the opening 32 and bend downward and extend downward along the outer side wall of the rear clip 3; the spring piece 92 is provided with a buckle 93 that can be inserted into the positioning hole 91; the buckle 93 is a right-angled triangle with a horizontal top. Symmetrical elastic arms 84 are provided on the shoulder of the locking plate 81, capable of pressing against the inner wall of the top of the receiving groove 31. In this embodiment, the locking component 8 is made of plastic or carbon fiber. The locking plate 81, the spring piece 92, and the elastic arms 84 are integrally formed. The elastic arms 84 are two arc-shaped parts that deform under force. Utilizing the elasticity of the material itself, without artificial pressure, the elastic arms 84 will press the locking plate 81 downward. When the locking tooth 82 is inserted into the annular tooth groove 41, the buckle 93 on the spring piece 92 will engage in the positioning hole 91. Since the locking plate 81 is restricted by the receiving groove 31 and cannot move left or right, the connecting bolt 4 cannot rotate. When unlocking is required, the spring piece 92 is pried upward to allow the buckle 93 to exit from the positioning hole 91. Then, the spring piece 92 is lifted upward to move the locking plate 81 upward, and the locking tooth 82 disengages from the annular tooth groove 41, allowing the connecting bolt 4 to rotate again.

[0036] It is important to note that, such as Figures 3 to 14As shown, the retractable structure 6 includes at least one oblique spiral groove 61 disposed on the outer circumferential wall of the connecting bolt 4 located at the front end of the annular toothed groove 41. The starting point of the oblique spiral groove 61 is located at the end of the connecting bolt 4 away from the folding handle 7, and the ending point of the oblique spiral groove 61 is located at the end of the connecting bolt 4 near the annular toothed groove 41. The oblique spiral groove 61 rotates less than one revolution along the outer circumferential wall of the connecting bolt 4. For details, please refer to [link to relevant documentation]. Figure 14 As shown, the slot 14 divides the connecting bolt 4 into left and right sections. The section near the folding handle 7 is where the annular toothed groove 41 is located, referred to as the locking section 80 in this embodiment. The other section is the driving section 60, on which the oblique spiral groove 61 is located. The starting point and ending point are at the left and right ends of the driving section 60, respectively. In this embodiment, there are two symmetrical oblique spiral grooves 61. The spiral line of the oblique spiral groove 61 rotates only half a circle around the outer circumference of the driving section 60. Figure 14 The angle θ between the spiral line of each oblique spiral groove 61 and the axis B of the connecting bolt 4 shown is 50 degrees. This means the spiral line of the oblique spiral groove 61 is a large-pitch spiral, allowing the connecting buckle 5 to move quickly on the connecting bolt 4, enabling quick installation and removal of the rear protective plate 1, making operation convenient and time-saving. The inner wall of the connecting buckle 5 is provided with protrusions 62 that can be embedded in the corresponding oblique spiral groove 61 and can move along the corresponding oblique spiral groove 61. It should be noted that the oblique spiral groove 61 can be one, two, three, or more, or it can be a U-shaped rotary spiral groove. If it is a U-shaped rotary spiral groove, it means that after the connecting bolt 4 is rotated by a certain angle, the connecting buckle 5 will move to one side along the connecting bolt 4. Continuing to rotate the connecting bolt 4, the connecting buckle 5 will move back to the side it came from.

[0037] In addition, such as Figures 2 to 13 As shown, a hexagonal countersunk hole 21, coaxial with the through hole 30, is provided on the front side wall of the front clip 2. The connecting buckle 5 includes a hexagonal piece 22 embedded in the hexagonal countersunk hole 21. A connecting post 23 extends from the center of one side of the hexagonal piece 22. A connecting hole 24 passes through the axis of the hexagonal piece 22 and the connecting post 23, and the end of the connecting bolt 4 away from the folding handle 7 passes through the connecting hole 24. The protrusion 62 is formed on the inner wall of the connecting hole 24. The hexagonal piece 22 is embedded in the hexagonal countersunk hole 21, which prevents the connecting buckle 5 from rotating but allows it to move along the connecting bolt 4, thus moving the front clip 2 synchronously.

[0038] Furthermore, to facilitate the rotation of the connecting bolt 4, the folding handle 7 includes a connector 71 fixedly disposed at one end of the connecting bolt 4 located outside the rear clip 3. The diameter of the connector 71 is larger than the diameter of the through hole 30. A torsion ring 72 that can be flipped to a horizontal position is hinged to the connector 71. The torsion ring 72 is a semi-circular arc hinged to the outer circumference of the connector 71. An inner groove 73 is provided along the outer circumference of the connector 71. A protrusion 74 that can be embedded in the inner groove 73 is provided on the inner wall of the torsion ring 72. The cross-sections of both the inner groove 73 and the protrusion 74 are semi-circular. When not in use, the torsion ring 72 is fixed by being embedded in the inner groove 73 through the protrusion 74. In this way, when the ice hockey player is skating, the collision will not cause the connecting bolt 4 to rotate, making it safer.

[0039] The foregoing has shown and described the basic principles and main features of the present invention, as well as its advantages. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the present invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A quick interchanging device of detachable back sheet comprising of back sheet (1) characterized in that: The back end of the back sheet (1) extends downwardly with a front clamping sheet (2) and a back clamping sheet (3), the front clamping sheet (2) and the back clamping sheet (3) can be mutually contracted to clamp the back sheet (1) at the position where the heel of the shoe body (10) is located at the top end of the upper, the front clamping sheet (2) and the back clamping sheet (3) are respectively provided with through holes (30) which are in communication with each other, a rotatable connecting bolt (4) is arranged in the through holes (30), the front clamping sheet (2) is provided with a connecting buckle (5) which can be movably sleeved on the connecting bolt (4), the connecting bolt (4) is provided with a contraction structure (6) which can move the connecting buckle (5) along the connecting bolt (4) when the connecting bolt (4) rotates, the end of the connecting bolt (4) which is located outside the back clamping sheet (3) is provided with a folding handle (7) which can drive the connecting bolt (4) to rotate, and the back clamping sheet (3) is provided with a locking member (8) which can lock the rotation of the connecting bolt (4).

2. The quick change device of detachable back sheet according to claim 1, characterized in that, The heel of the shoe body (10) is provided with an installation groove (11) at the position where the heel is located at the top end of the upper, the through holes (30) correspond to the installation groove (11) respectively and are in communication with each other, and the inner side walls of the front clamping sheet (2) and the back clamping sheet (3) which face each other are provided with friction lines (12) which can contact the front and back sides of the heel of the shoe body (10) respectively.

3. The quick change device of detachable back sheet according to claim 1, characterized in that, The circumferential outer wall of the connecting bolt (4) near one end of the folding handle (7) is provided with an annular tooth groove (41) which surrounds the circumferential outer wall of the connecting bolt (4), the locking member (8) comprises a locking plate (81) which can move up and down and is arranged on the inner side wall of the back clamping sheet (3), the bottom of the locking plate (81) is provided with a locking tooth (82) which can be inserted into the annular tooth groove (41), and the locking member (8) is provided with a lock buckle (9) which can lock the locking plate (81) on the inner side wall of the back clamping sheet (3) and cannot move up and down when the locking tooth (82) is inserted into the annular tooth groove (41).

4. The quick change device of detachable back sheet according to claim 3, characterized in that, The contraction structure (6) comprises at least one inclined spiral groove (61) which is arranged on the circumferential outer wall of the connecting bolt (4) at the front end of the annular tooth groove (41), the starting point of the inclined spiral groove (61) is located at one end of the connecting bolt (4) which is away from the folding handle (7), the terminal point of the inclined spiral groove (61) is located at one end of the connecting bolt (4) which is close to the annular tooth groove (41), the inclined spiral groove (61) rotates less than one circle along the circumferential outer wall of the connecting bolt (4), and the inner wall of the connecting buckle (5) is provided with a protruding point (62) which can be embedded into the corresponding inclined spiral groove (61) and can move along the corresponding inclined spiral groove (61).

5. The quick change device of detachable back sheet according to claim 4, characterized in that, A hexagonal hole (21) coaxial with the through hole (30) is arranged on the front side wall of the front clamping piece (2), the connecting buckle (5) comprises a hexagonal piece (22) embedded in the hexagonal hole (21), one side of the hexagonal piece (22) extends a connecting column (23), a sleeve hole (24) is arranged through the hexagonal piece (22) and the connecting column (23) coaxially, the connecting bolt (4) is arranged in the sleeve hole (24) away from the folding handle (7), and the convex point (62) is arranged on the inner wall of the sleeve hole (24).

6. A quick change device for removable back panel according to claim 1, characterized in that, The folding handle (7) comprises a connecting head (71) fixedly arranged at one end of the connecting bolt (4) located outside the rear clamping piece (3), the diameter of the connecting head (71) is greater than that of the through hole (30), and a reversible torsion ring (72) is hingedly arranged on the connecting head (71).

7. The quick change device of detachable back sheet according to claim 6, characterized in that, The torsion ring (72) is hingedly arranged in a semicircular arc shape on the circumferential outer wall of the connecting head (71), the inner recess (73) is arranged along the circumferential outer wall of the connecting head (71), the convex part (74) is arranged on the inner wall of the torsion ring (72) and can be embedded in the inner recess (73), and the cross sections of the inner recess (73) and the convex part (74) are semicircular.

8. The quick change device of detachable back sheet according to claim 3, characterized in that, A containing groove (31) is arranged on the inner side wall of the rear clamping piece (3), an opening (32) is arranged on the outer side wall of the rear clamping piece (3) and communicates with the top of the containing groove (31), the locking plate (81) is movably arranged in the containing groove (31), a trapezoidal guide groove (33) is arranged in the containing groove (31), and a trapezoidal guide block (83) is fixedly arranged on the locking plate (81) and can be embedded in the guide groove (33) and slide up and down along the guide groove (33).

9. The quick change device of detachable back sheet according to claim 8, characterized in that, The lock buckle (9) comprises a positioning hole (91) arranged on the outer side wall of the rear clamping piece (3), the top of the locking plate (81) is provided with a spring piece (92) capable of extending out of the opening (32) and extending downward along the outer side wall of the rear clamping piece (3), and the spring piece (92) is provided with a buckle (93) capable of being clamped into the positioning hole (91).

10. The quick change device of detachable back sheet according to claim 8, characterized in that, The locking plate (81) is provided with a spring arm (84) capable of abutting against the inner wall of the top of the containing groove (31) on the shoulder.

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