A kind of prosthetic hand quick-change rotating wrist

Abstract

The invention discloses a prosthetic hand quick-change rotating wrist, comprising a residual limb support and a rotating wrist fixedly connected to the residual limb support, the residual limb support comprising a cylindrical lower shell and a lower contact plate arranged in the inner cavity of the lower shell, the lower end of the lower contact plate is provided with an elastic device in contact with its lower end surface, the elastic device is arranged in the lower shell, the lower contact plate can elastically move up and down along the inner side surface of the lower shell, and a plurality of lock buckles are formed at intervals at the opening of the lower shell; the rotating wrist comprises a cylindrical upper shell and a rotating body arranged in the inner cavity of the upper shell, an upper contact plate is provided at the bottom of the rotating body, a relative rotation connection is formed between the rotating body and the upper shell, and a plurality of connecting pieces are provided on the outer side surface of the upper shell; when the upper shell is inserted into the inner cavity of the lower shell, the connecting piece is connected with the lock buckle one by one, and the upper shell is locked with the lower shell, the upper contact plate is electrically connected with the lower contact plate, and is always in a pressed contact conductive state, avoiding the line winding problem existing in the line connection, and making it more convenient for disabled people to use.

Description

Technical Field

[0001] The invention relates to the technical field of bionic hands, in particular to a prosthetic hand quick-change rotating wrist, which is mainly installed between a prosthetic hand and a prosthetic cavity. Background Art

[0002] The prosthetic hand rotating wrist is located between the prosthetic hand and the residual limb receiving cavity. The prosthetic hand can rotate around the axis of the residual limb receiving cavity through the rotating wrist to enable the prosthetic hand to complete various movements. At present, there are two types of existing rotating wrists, one is a friction type rotating wrist and the other is a ratchet type rotating wrist. Among them, the friction type rotating wrist relies on the friction torque generated by the rotation to maintain the posture after rotation. Its rotation angle is subject to certain restrictions. It can usually only achieve reciprocating rotation within 360° and cannot rotate in one direction, otherwise it will cause entanglement of the internal circuit; the ratchet type rotating wrist adopts a circumferential ratchet, which is achieved through the cooperation between the pawl and the ratchet. When the prosthetic hand needs to rotate a certain angle, it is necessary to press the distal end of the pawl to disengage the pawl from the ratchet so that the ratchet can rotate. When it rotates to the required angle, release the pawl to engage the ratchet with the pawl to achieve the posture holding function. Although the existing ratchet-type rotating wrist can realize the quick-change function and its structure can well maintain the posture after rotating to a certain angle, its complex structure has high manufacturing costs, and in actual operation, the ratchet needs to be pressed and maintained before further rotating, which is time-consuming and laborious.

[0003] Although the existing friction type rotating wrist has a simple structure, after long-term use, the friction material wears out, and the posture-maintaining ability of the prosthetic hand decreases, which is not conducive to the disabled person's self-operation. Summary of the invention

[0004] In view of the above deficiencies in the prior art and to solve the technical problems that the existing friction-type rotating wrist is difficult to achieve quick change and difficult to maintain the posture after rotation, the present invention provides a prosthetic hand quick-change rotating wrist that can rotate in one direction all the time, does not cause the technical problem of line entanglement, and can still maintain a good posture after long-term use, is easy to process and has low cost.

[0005] In order to achieve the above object, the present invention adopts the following technical scheme:

[0006] A prosthetic hand quick-change rotating wrist, comprising a residual limb support and a rotating wrist fixedly connected to the residual limb support, the residual limb support comprising a cylindrical lower shell and a lower contact plate arranged in the inner cavity of the lower shell, the lower end of the lower contact plate is provided with an elastic device in contact with its lower end surface, the elastic device is arranged in the lower shell, the lower contact plate can elastically move up and down along the inner side surface of the lower shell, and a plurality of lock buckles are arranged at intervals at the opening of the lower shell;

[0007] The rotating wrist comprises a cylindrical upper shell and a rotating body arranged in the inner cavity of the upper shell, an upper contact plate is arranged at the bottom of the rotating body, a relative rotation connection is formed between the rotating body and the upper shell, and a plurality of connecting pieces having the same number as the lock buckle are arranged on the outer side surface of the upper shell;

[0008] When the upper shell is inserted into the inner cavity of the lower shell, the multiple connecting parts are connected to the multiple locking buckles one by one, and the upper shell is locked with the lower shell. The upper contact plate is electrically connected to the lower contact plate, and the upper contact plate and the lower contact plate are kept in pressure fit by the rebound force of the elastic device.

[0009] The elastic device includes a wrist bottom cover, a screw and a spring. The wrist bottom cover is arranged at the lower end opening position of the lower shell. A radially extending first boss is provided at the middle position of the inner side surface of the lower shell. The screw passes through the wrist bottom cover and the lower contact plate in sequence and is fixedly connected to the first boss. The spring is sleeved on the screw between the wrist bottom cover and the lower contact plate, and the lower contact plate can move up and down along the screw.

[0010] The lock buckle is a plurality of L-shaped notches formed at the opening of the upper end of the lower shell and arranged at intervals, and the tail of the L-shaped notch forms a locking hole, and the plurality of L-shaped notches are located on the same circumference of the lower shell; the connecting piece is a cylindrical pin formed on the outer surface of the upper shell, the cylindrical pin is perpendicular to the outer surface of the upper shell, and the cylindrical pin slides into the locking hole to lock the upper shell and the lower shell.

[0011] A radially extending second boss is formed on the upper inner side surface of the upper shell, and a through hole is formed in the middle of the second boss; the rotating body comprises a wrist top cover, a clamping plate, a circuit board and an upper contact plate, a protrusion arranged in the through hole is formed in the middle of the wrist top cover, the clamping plate is arranged on the lower end surface of the second boss, and is fixedly connected to the protrusion by a fastening connector; the upper contact plate extends out of the lower end surface of the upper shell, and is fixedly connected to the clamping plate by a supporting device; the circuit board is arranged on the supporting device; when the upper shell is locked with the lower shell, the spring generates a rebound force, which squeezes the lower contact plate so that the upper contact plate and the lower contact plate are tightly fitted, and the clamping plate and the lower end surface of the second boss are squeezed and fitted.

[0012] In order to avoid the noise generated when the rotating body rotates, an annular groove is formed on the upper end surface and the lower end surface of the second boss respectively, and an elastic rubber pad is provided in the annular groove. The clamping plate and the wrist top cover are respectively in extrusion contact with the elastic rubber pad.

[0013] The supporting device includes a first connecting boss and a second connecting boss, the circuit board is arranged between the first connecting boss and the second connecting boss, the upper contact plate is arranged at the lower end of the second connecting boss, and the upper contact plate, the first connecting boss, the circuit board, the second connecting boss and the clamping plate are fixed to form a whole through a fastening connector.

[0014] Furthermore, the first connecting boss and the second connecting boss respectively include a horizontal bracket and a plurality of protrusions fixedly connected to the horizontal bracket, each of the protrusions is provided with a connecting hole for penetrating a fastening connector, and the two side surfaces of the circuit board are respectively in contact with the protrusion of the first connecting boss and the protrusion of the second connecting boss.

[0015] The upper contact plate and the lower contact plate are non-metallic plates, each of which is provided with a multi-stage concentric annular groove. The rotation axis of the rotating body vertically passes through the center of the annular groove, and each of the annular grooves is provided with a conductive metal plate protruding from the plate surface where the annular groove is located; when the upper shell body is locked with the lower shell body, the conductive metal plate on the upper contact plate is in one-to-one contact with the conductive metal plate on the lower contact plate.

[0016] The upper contact plate and the lower contact plate are both made of nylon, and the conductive metal plate is brass.

[0017] The lower shell body is also provided with a fixing hole, and the lower shell body is fixedly connected to the contact cavity installed on the residual limb through a fixing connector penetrating the fixing hole.

[0018] The technical solution of the present invention has the following advantages:

[0019] A. The present invention sets a locking structure between the residual limb support and the rotating wrist, which can realize the rapid assembly of the two. At the same time, due to the use of a contact-type electrical connection method, the lower contact plate on the residual limb support and the upper contact plate at the lower end of the rotating wrist are always in a contacting and conductive state under the action of the rebound force of the elastic device, and are not limited by the rotation angle of the rotating body, thus avoiding the line entanglement problem existing in the use of line connection, and making it more convenient for disabled people to use.

[0020] B. The present invention establishes a second boss on the upper shell body, and a clamping plate in the rotating body forms friction with the lower end surface of the second boss, wherein the clamping plate is acted upon by the rebound force of the elastic device, so that a certain extrusion is formed between the clamping plate and the second boss. This elastic extrusion force can be maintained between the clamping plate and the second boss for a relatively long time, thereby solving the technical problem of the existing friction type rotating wrist that the prosthetic hand posture is difficult to maintain for a long time and reducing the failure rate.

[0021] C. In the present invention, wear-resistant rubber pads are provided between the rotating body and the upper and lower end surfaces of the second boss, so that the rotating body does not generate any noise when rotating.

[0022] D. The present invention sets connecting bosses and horizontal brackets on the upper and lower sides of the circuit board. The connecting bosses and the horizontal brackets are insulating parts to prevent the circuit board from contacting metal and causing a short circuit. At the same time, the bosses are formed into an integrated structure through the horizontal brackets for easy installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a cross-sectional view of the quick-change rotating wrist structure of the prosthetic hand provided by the present invention;

[0025] Figure 2 It is a schematic diagram of the structure when the rotating wrist is separated from the residual limb support;

[0026] Figure 3 It is a schematic diagram of the structure after the rotation wrist is combined with the residual limb support;

[0027] Figure 4 yes Figure 1 A three-dimensional diagram of the supporting device structure;

[0028] Figure 5 yes Figure 4 Schematic diagram of the plane structure shown;

[0029] Figure 6 yes Figure 1 Schematic diagram of the plane structure on the lower contact plate;

[0030] Figure 7 Schematic diagram of the bottom surface structure of the lower contact plate.

[0031] Description of reference numerals:

[0032] 1-Residual limb support

[0033] 11-Lower housing

[0034] 111-first boss

[0035] 12-Lower contact plate

[0036] 13-Elastic device

[0037] 131- wrist bottom cover, 132- screw, 133- spring

[0038] 1A-Lock

[0039] 2-Rotate your wrist,

[0040] 21-Upper shell

[0041] 22- Rotating body

[0042] 221- wrist cover, 222- pressing plate, 223- circuit board, 224- protrusion

[0043] 225-Support device

[0044] 225-1 first connecting boss, 225-2 second connecting boss

[0045] 225A-horizontal bracket, 225B-bump, 225C-connection hole

[0046] 23-Upper contact plate

[0047] 24-Second boss

[0048] 241- annular groove,

[0049] 2A-Connector

[0050] 3-locking hole; 4-through hole; 5-fastening connector; 6-elastic rubber pad; 7-annular groove

[0051] 8-conductive metal plate; 9-fastening hole; 10-nylon gasket; 20-fixing block. DETAILED DESCRIPTION

[0052] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] like Figure 1 and Figure 2 As shown, the present invention provides a prosthetic hand quick-change rotating wrist, including a residual limb support 1 and a rotating wrist 2 fixedly connected to the residual limb support 1, the residual limb support 1 includes a cylindrical lower shell 11 and a lower contact plate 12 arranged in the inner cavity of the lower shell 11, the lower end of the lower contact plate 12 is provided with an elastic device 13 in contact with its lower end surface, the elastic device 13 is arranged in the lower shell 11, under the elastic action of the elastic device 13, the lower contact plate 12 elastically moves up and down along the inner side surface of the lower shell 11; at the same time, a plurality of lock buckles 1A are arranged at intervals at the opening of the lower shell 11.

[0054] The rotating wrist 2 includes a cylindrical upper shell 21 and a rotating body 22 disposed in the inner cavity of the upper shell 21. An upper contact plate 23 is disposed at the bottom of the rotating body 22. A relative rotation connection is formed between the rotating body 22 and the upper shell 21. A plurality of connecting members 2A having the same number as the lock buckle 1A are disposed on the outer side of the upper shell 21. Figure 2 and Figure 3 As shown, when the upper shell 21 is inserted into the inner cavity of the lower shell 11, multiple connecting parts 2A are connected one by one with multiple locking buckles 1A, and the upper shell 21 is locked with the lower shell 11, and the upper contact plate 23 is electrically connected with the lower contact plate 12. At this time, the lower contact plate 12 is pressed downward by the rotating body, and the elastic device 13 generates a rebound force, and the rebound force of the elastic device 13 keeps the upper contact plate 23 and the lower contact plate 12 in pressure fit.

[0055] When the rotating body rotates in the upper shell, the upper contact plate and the lower contact plate rotate and slide relative to each other, and the contact surfaces of the two plates are always in a contact, extrusion and fitting state. When the upper contact plate rotates, the electrical connection can also be maintained at all times. The structure of the lower contact plate is as follows: Figure 6 and Figure 7 As shown, both are provided with an annular conductive metal plate 8.

[0056] The upper contact plate 23 and the lower contact plate 12 are both non-metal plates, preferably made of nylon plastic, and are respectively provided with multi-stage concentric annular grooves 7. The rotation axis of the rotating body 22 vertically passes through the center of the annular groove 7. Each annular groove 7 is provided with a conductive metal plate 8 protruding from the plate surface where the annular groove 7 is located. Figure 1 As shown, when the upper shell 21 is locked with the lower shell 11, the conductive metal plate 8 on the upper contact plate 23 contacts the conductive metal plate 8 on the lower contact plate 12 one by one. When the rotating body drives the upper contact plate to rotate, the conductive metal plates on the upper and lower contact plates are always in contact under the action of the elastic device. The conductive metal plate 8 here is preferably brass.

[0057] The elastic device 13 adopted in the present invention includes a wrist bottom cover 131, a screw 132 and a spring 133. The wrist bottom cover 131 is arranged at the lower end opening position of the lower shell 11 and is snap-connected with the edge of the lower shell 11. A radially extending first boss 111 is provided in the middle position of the inner side surface of the lower shell 11. The first boss 111 here forms a whole with the lower shell 11. The screw 132 sequentially penetrates the wrist bottom cover 131 and the lower contact plate 12 and is threadedly connected with the lower end surface of the first boss 111. The spring 133 is sleeved on the screw 132 between the wrist bottom cover 131 and the lower contact plate 12. When the lower contact plate is pressed, the lower contact plate 12 slides up and down along the screw 132 with the screw 132 as a guide.

[0058] The lock 1A structure preferably adopts Figure 2 and Figure 3As shown, of course, it is not limited to this. Specifically, the lock buckle 1A is a plurality of L-shaped notches formed at the upper end opening of the lower shell 11 and arranged at intervals. The tail of the L-shaped notch forms a locking hole 3, and the locking hole 3 is located above the L-shaped notch. The plurality of L-shaped notches are located on the same circumference of the lower shell 11, and the tails of the plurality of L-shaped notches face the same rotation direction; the connecting member 2A here is a cylindrical pin formed on the outer side of the upper shell 21 and matched with the L-shaped notch. The cylindrical pin is perpendicular to the outer side of the upper shell 21. When the rotating wrist 2 and the residual limb support 1 are installed together, the cylindrical pin on the upper shell 21 is first slid into the L-shaped notch of the lower shell 11. In the process of pushing the rotating wrist 2 to move along the L-shaped notch, the upper contact plate 23 and the lower contact plate 1 2 gradually fits together and exerts a downward pressure on the lower contact plate 12, which further squeezes the spring 133 to make it move downward along the screw 132. When the cylindrical pin slides into the bottom of the L-shaped notch, the disabled person's healthy hand rotates the rotating body 22 in one direction, so that all the cylindrical pins rotate circumferentially at a certain angle and then slide into the tail of the L-shaped notch, and the rotating body 22 is released. Under the rebound force of the spring 133, the cylindrical pin on the rotating wrist 2 automatically moves up and enters the locking hole 3, thereby completing the locking and fixing between the rotating wrist 2 and the residual limb support 1; when the rotating wrist 2 is separated from the residual limb support 1, the rotating wrist 2 is first pressed to disengage the cylindrical pin from the locking hole 3, and then the rotating wrist 2 is rotated in the opposite direction, and then it automatically slides out under the rebound force of the spring 133.

[0059] The present invention further preferably forms a radially extending second boss 24 on the upper inner side surface of the upper shell 21, and the second boss 24 forms an integral body with the upper shell 21. The second boss 24 here can be a continuous structure, and of course it can also be a discontinuous structure; a through hole 4 is formed in the middle of the second boss 24; wherein the rotating body 22 includes a wrist top cover 221, a clamping sheet 222 and a circuit board 223, a protrusion 224 arranged in the through hole 4 is formed in the middle of the wrist top cover 221, and the clamping sheet 222 is arranged on the lower end surface of the second boss 24, and the clamping sheet 222 is connected by a fastening The connecting piece 5 is fixedly connected to the lower end surface of the protrusion 224; the upper contact plate 23 extends out of the lower end surface of the upper shell 21, and is fixedly connected to the clamping plate 222 through a supporting device 225, and the circuit board 223 is arranged on the supporting device 225; when the upper shell 21 is locked with the lower shell 11, the spring 133 generates a rebound force, which squeezes the lower contact plate 12 so that the upper contact plate 23 and the lower contact plate 12 are tightly fitted, and the clamping plate 222 and the lower end surface of the second boss 24 are squeezed and fitted. As a result, the present invention completely solves the technical problem of the decreased posture maintenance ability of the prosthetic hand after long-term use.

[0060] In order to avoid noise generated when the rotating wrist rotates, the present invention forms an annular groove 241 on the upper end surface and the lower end surface of the second boss 24 respectively, and an elastic rubber pad 6 is provided in the annular groove 241, preferably an O-shaped rubber ring, which is installed in the annular groove 241 and protrudes from the upper end surface and the lower end surface of the second boss, so that the clamping plate 222 and the wrist top cover 221 are respectively in extrusion contact with the elastic rubber pad 6, and no noise is generated when the rotating body rotates.

[0061] like Figure 1 As shown, the supporting device 225 here specifically includes a first connecting boss 225-1 and a second connecting boss 225-2 made of insulating material, the circuit board 223 is arranged between the first connecting boss 225-1 and the second connecting boss 225-2, the upper contact plate 23 is arranged at the lower end of the second connecting boss 225-2, and the upper contact plate 23, the first connecting boss 225-1, the circuit board 223, the second connecting boss 225-2 and the clamping plate 222 are fixed by a fastening connector to form a whole.

[0062] like Figure 4 and Figure 5 As shown, the preferred structures of the first connecting boss 225-1 and the second connecting boss 225-2 respectively include a horizontal bracket 225A and a plurality of protrusions 225B fixedly connected to the horizontal bracket 225A, and the two can be integrally formed. Each protrusion 225B is provided with a connecting hole 225C for penetrating a fastening connector, and the two side surfaces of the circuit board 223 are in contact with the protrusions of the first connecting boss 225-1 and the protrusions of the second connecting boss 225-2 respectively. The horizontal bracket 225A here can adopt a panel structure, Figure 4 The four protrusions are fixed on the same side of the panel. Of course, the horizontal bracket in the present invention is preferably formed by four support rods, and the four protrusions are respectively fixed at the four corners of the horizontal bracket, and its structure is simpler. The first connecting boss 225-1 and the second connecting boss 225-2 are both insulating parts, which prevent the circuit board from contacting the metal and causing a short circuit; at the same time, the protrusions are formed into an integrated structure through the horizontal bracket, which is easy to install.

[0063] In addition, the present invention further provides a fixing hole 9 on the lower shell 11. When the rotating wrist 2 is locked with the residual limb support 1, the lower shell 11 is fixedly connected to the contact cavity installed on the residual limb through a fixing connector passing through the fixing hole 9. The position of the contact cavity is not shown in the figure.

[0064] The above-mentioned fastening connectors may be bolts, screws or other pin connectors, and are not specifically limited thereto.

[0065] At the same time, the present application also fixes a fixing block 20 for fixing the prosthetic hand on the upper end surface of the wrist top cover 221, and is used to connect the prosthetic hand to the rotating body 22 of the rotating wrist 2. A nylon gasket 10 is also provided between the lower end surface of the wrist top cover 221 and the upper end surface of the second boss 24, and the nylon gasket 10 here can further avoid the noise generated by the hard friction during rotation.

[0066] The present invention drives the rotating wrist 2 to rotate manually or electrically to cause the prosthetic hand to rotate synchronously. The prosthetic hand can rotate at multiple angles. The user does not need to consider the rotation angle of the rotating wrist during use, which brings convenience to the user. At the same time, it also further solves the disadvantage of poor posture retention force of the existing friction type rotating wrist through a simple structure.

[0067] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, the obvious changes or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A prosthetic hand quick-change rotating wrist, comprising a residual limb support (1) and a rotating wrist (2) fixedly connected to the residual limb support (1), Features: The residual limb support (1) comprises a cylindrical lower shell (11) and a lower contact plate (12) arranged in the inner cavity of the lower shell (11); the lower end of the lower contact plate (12) is provided with an elastic device (13) in contact with the lower end surface thereof; the elastic device (13) is arranged in the lower shell (11); the lower contact plate (12) can elastically move up and down along the inner side surface of the lower shell (11); and a plurality of lock buckles (1A) are arranged at intervals at the opening of the lower shell (11); The rotating wrist (2) comprises a cylindrical upper shell (21) and a rotating body (22) arranged in the inner cavity of the upper shell (21); an upper contact plate (23) is provided at the bottom of the rotating body (22); a relative rotation connection is formed between the rotating body (22) and the upper shell (21); and a plurality of connecting members (2A) having the same number as the lock buckle (1A) are provided on the outer side surface of the upper shell (21); When the upper shell (21) is inserted into the inner cavity of the lower shell (11), the plurality of connecting members (2A) are connected to the plurality of locking buckles (1A) in a one-to-one correspondence, and the upper shell (21) is locked with the lower shell (11); the upper contact plate (23) is electrically connected with the lower contact plate (12), and the upper contact plate (23) is kept in pressure contact with the lower contact plate (12) through the rebound force of the elastic device (13); The upper contact plate (23) and the lower contact plate (12) are non-metal plates, each of which is provided with a plurality of concentric annular grooves (7); the rotation axis of the rotating body (22) vertically passes through the center of the annular groove (7); each of the annular grooves (7) is provided with a conductive metal plate (8) protruding from the plate surface where the annular groove (7) is located; when the upper shell (21) and the lower shell (11) are locked, the conductive metal plate (8) on the upper contact plate (23) contacts the conductive metal plate (8) on the lower contact plate (12) in a one-to-one correspondence; The lower shell (11) is also provided with a fixing hole (9), and the lower shell (11) is fixedly connected to the contact cavity installed on the residual limb by a fixing connector penetrating the fixing hole (9).

2. The prosthetic hand quick-change rotating wrist according to claim 1, It is characterized in that The elastic device (13) comprises a wrist bottom cover (131), a screw rod (132) and a spring (133); the wrist bottom cover (131) is arranged at the lower end opening position of the lower shell (11); a radially extending first boss (111) is provided at the middle position of the inner side surface of the lower shell (11); the screw rod (132) sequentially penetrates the wrist bottom cover (131) and the lower contact plate (12) and is fixedly connected to the first boss (111); the spring (133) is sleeved on the screw rod (132) between the wrist bottom cover (131) and the lower contact plate (12); and the lower contact plate (12) can move up and down along the screw rod (132).

3. The prosthetic hand quick-change rotating wrist according to claim 2, It is characterized in that The lock buckle (1A) is a plurality of L-shaped notches formed at intervals at the upper opening of the lower shell (11), the tail of the L-shaped notches forming a locking hole (3), and the plurality of L-shaped notches are located on the same circumference of the lower shell (11); the connecting member (2A) is a cylindrical pin formed on the outer surface of the upper shell (21), the cylindrical pin is perpendicular to the outer side surface of the upper shell (21), and the cylindrical pin slides into the locking hole (3) to lock the upper shell (21) and the lower shell (11).

4. The prosthetic hand quick-change rotating wrist according to claim 2 or 3, It is characterized in that The upper inner side surface of the upper shell (21) is formed with a radially extending second boss (24), and the middle portion of the second boss (24) is formed with a through hole (4); the rotating body (22) comprises a wrist top cover (221), a clamping sheet (222) and a circuit board (223); the middle portion of the wrist top cover (221) is formed with a protrusion (224) disposed in the through hole (4); the clamping sheet (222) is disposed on the lower end surface of the second boss (24) and is fixedly connected to the protrusion (224) via a fastening connector (5); the upper connector The touch plate (23) extends out of the lower end surface of the upper shell (21) and is fixedly connected to the clamping plate (222) via a supporting device (225); the circuit board (223) is arranged on the supporting device (225); when the upper shell (21) and the lower shell (11) are locked, the spring (133) generates a rebound force to squeeze the lower contact plate (12) so that the upper contact plate (23) and the lower contact plate (12) are tightly fitted, and the clamping plate (222) and the lower end surface of the second boss (24) are pressed and fitted.

5. The prosthetic hand quick-change rotating wrist according to claim 4, It is characterized in that An annular groove (241) is formed on the upper end surface and the lower end surface of the second boss (24), respectively, an elastic rubber pad (6) is provided in the annular groove (241), and the pressing sheet (222) and the wrist top cover (221) are in extrusion contact with the elastic rubber pad (6) respectively.

6. The prosthetic hand quick-change rotating wrist according to claim 5, It is characterized in that The supporting device (225) comprises a first connecting boss (225-1) and a second connecting boss (225-2); the circuit board (223) is arranged between the first connecting boss (225-1) and the second connecting boss (225-2); the upper contact plate (23) is arranged at the lower end of the second connecting boss (225-2); and the upper contact plate (23), the first connecting boss (225-1), the circuit board (223), the second connecting boss (225-2) and the pressing plate (222) are fixed to form a whole by means of a fastening connector.

7. The prosthetic hand quick-change rotating wrist according to claim 6, It is characterized in that The first connecting boss (225-1) and the second connecting boss (225-2) respectively comprise a horizontal bracket (225A) and a plurality of protrusions (225B) fixedly connected to the horizontal bracket (225A), each of the protrusions (225B) being provided with a connecting hole (225C) for penetrating a fastening connecting member, and the two side surfaces of the circuit board (223) respectively contact the protrusions of the first connecting boss (225-1) and the protrusions of the second connecting boss (225-2).

8. The prosthetic hand quick-change rotating wrist according to claim 1, It is characterized in that The upper contact plate (23) and the lower contact plate (12) are both made of nylon, and the conductive metal plate (8) is brass.

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