Patient pruritus alleviator

Abstract

The invention relates to the technical field of leprosy prevention and rehabilitation treatment, and discloses a patient itching alleviator which comprises a scratching assembly, the scratching assembly comprises a shell, a layer plate piece is clamped to the bottom of the shell, a bottom shell is connected to the bottom of the layer plate piece through a screw, a foot rod is integrally connected to the interior of the layer plate piece, and an annular support is connected to the top of the foot rod through a screw; a main gear, a branch gear and a rotating shaft of a transmission gear are rotationally connected into the annular support. Through the special gear transmission structure design, the pressing rod is pressed to drive a series of gears to rotate, finally, the scratching ball head rolls, the conical protrusions on the outer surface of the scratching ball head can make better contact with the skin, the scratching effect is achieved, the pruritus feeling of a patient is relieved, the scratching ball head is made of the Shore A20-30-degree silica gel material and is relatively mild, the scratching requirement can be met, and the scratching effect is good. And moreover, the special touch feeling is provided, so that the mask is suitable for the skin condition of dysfunction of leprosy patients caused by nerve endings damage.

Description

Technical Field

[0001] The invention relates to the technical field of leprosy prevention, treatment and rehabilitation, in particular to an itching reliever for patients. Background Art

[0002] Leprosy is a chronic infectious disease caused by infection with Mycobacterium leprae, which primarily affects the skin and peripheral nerves. Once the bacteria invade the skin, they cause changes in its structure and physiological functions. Firstly, the bacteria damage the skin's nerve endings, affecting the normal conduction function of the nerves and disrupting the nerves' regulation of sensations such as itching. Secondly, the body's immune response to Mycobacterium leprae triggers inflammation. The release of inflammatory mediators such as histamine and prostaglandins stimulates the skin's sensory nerve endings, causing itching.

[0003] According to a search, a Chinese patent document, publication number CN119185045A, discloses an itch reliever for dermatology patients. A motor drives multiple itch rollers to rotate, while a cam squeezes a movable plate to move back and forth repeatedly. The itch rollers rotate and contact the arm, relieving itching on the arm. The back-and-forth movement of the itch rollers can also expand the range of the itch.

[0004] However, the above-mentioned itch reliever needs to rely on a motor or other driving device to drive the itch roller to relieve itching during actual use. On the one hand, the overall structure is large in size and high in cost, and it is not convenient to relieve itching on parts other than the arm. On the other hand, the function is single and there is no performance in assisting rehabilitation. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention provides a patient itch reliever that is small in size, easy to carry, simple to operate, and can assist in finger exercises. It can stimulate the nerve endings in the hands, promote nerve repair and regeneration, and help repair the problem of hand sensory and motor dysfunction caused by hand nerve damage in leprosy patients, thereby solving the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a patient itch reliever, comprising a scratching assembly, which includes a shell, a layer plate member clamped on the bottom of the shell, the bottom of the layer plate member is connected to the bottom shell by screws, and a foot rod is integrally connected to the inside of the layer plate member, the top of the foot rod is connected to an annular bracket by screws, the inside of the annular bracket is rotatably connected to the rotating shaft of the main gear, the sub-gear and the transmission gear, the top of the rotating shaft of the main gear is fixedly connected to a No. 1 bevel gear, the bottom surface of the transmission gear is fixedly connected to an inclined circular cone, the inclined surface of the inclined circular cone is in rolling contact with a hemispherical rotating member, and the bottom of the hemispherical rotating member is clamped with a scratching ball head;

[0007] A manual drive assembly includes a telescopic rod, a sleeve rod is fitted on the inner wall of the telescopic rod, an extension rod is slidably connected to the inside of the sleeve rod, one end of the extension rod is fixedly connected to a No. 2 bevel gear, one end of the sleeve rod is fixedly connected to a No. 3 bevel gear, one end of the telescopic rod is threadedly connected to an arc-shaped shell, a driving gear is rotatably connected to the inner wall of the arc-shaped shell, a connecting rod is rotatably connected to the end surface of the driving gear, and the driving gear is meshed with a pinion, and a No. 4 bevel gear is fixedly connected to the end surface of the pinion, one end of the connecting rod is hinged with an ear block, one end of the ear block is fixedly connected to a pressure rod, and one side of the arc-shaped shell is fixedly connected to a handle.

[0008] Preferably, there is one main gear and one branch gear, and the main gear and the branch gear are meshed with each other. Four transmission gears are arranged in an array around the axial direction of the layer plate member, and two of the transmission gears are meshed with the main gear, and the other two are meshed with the branch gears.

[0009] Preferably, the upper surface of the layer plate member is integrally connected with four foot rods around its axial direction, and the lower surface of the layer plate member is arrayed with four circular grooves around its axial direction, and an inclined cone is inserted into each of the four circular grooves, and an arc groove is provided on the inclined surface of the inclined cone.

[0010] Preferably, the hemispherical rotating member includes a rotating member body, a limiting cover and steel balls. The top of the rotating member body is connected to the limiting cover via screws, and the steel balls are in rolling contact between the rotating member body and the limiting cover.

[0011] Preferably, four hemispherical grooves are opened on the upper surface of the rotating part body around its axial direction, and four annular grooves are opened on the end surface of the limit cover around its axial direction. The hemispherical grooves and the annular grooves are connected, and the hemispherical grooves and the steel balls in the annular grooves are in rolling contact. Four through grooves are opened on the lower surface of the bottom shell, and the through grooves are in rolling contact with the rotating part body.

[0012] Preferably, a telescopic rod is threadedly connected to the outer wall of the shell, a plurality of conical protrusions are fixedly connected to the outer surface of the tickling ball head, the tickling ball head is made of silicone, and the hardness of the tickling ball head is Shore A 20-30 degrees.

[0013] Preferably, the outer surface of the arc-shaped housing is connected to a cover plate by screws, the No. 1 bevel gear is meshed with the No. 2 bevel gear, and the No. 3 bevel gear is meshed with the No. 4 bevel gear.

[0014] Preferably, an arcuate groove for the connecting rod to pass through is opened on the outer wall of the arcuate shell, one end of the pressure rod is hinged to the outer wall of the arcuate shell, and the pinion is rotatably connected to the inner wall of the arcuate shell.

[0015] Preferably, a sliding key is fixedly connected to the outer wall of the extension rod, a sliding groove is provided on the inner wall of the sleeve rod, the sliding key slides in cooperation with the sliding groove, the end of the extension rod away from the sliding key is fixedly connected to a No. 1 bevel tooth, and a dustproof bottom support cover is clamped on the outer surface of the bottom shell.

[0016] Compared with the prior art, the present invention provides a patient itch relief device with the following beneficial effects:

[0017] 1. The present invention adopts a special gear transmission structure design. Pressing the pressure rod drives a series of gears to rotate, and finally makes the tickling ball head roll. The conical protrusions on its outer surface can better contact the skin, play a tickling role, and relieve the patient's itching. The tickling ball head is made of 20-30 degrees Shore A silicone material, which is relatively mild. It can not only meet the tickling needs but also protect the patient's skin to the greatest extent. The special touch it provides is suitable for the skin condition of leprosy patients with sensory dysfunction due to damaged nerve endings. It can allow patients to feel the tickling stimulation to relieve itching without causing disgust.

[0018] 2. The present invention requires the patient to move his fingers when operating the manual drive component. For leprosy patients with hand nerve damage and tactile disorders, the grasping, pressing, and plucking of the fingers can stimulate the nerve endings of the hand, promote nerve repair and regeneration, enhance hand muscle strength, improve hand joint flexibility and coordination, and gradually restore the hand's fine motor skills, thereby improving the patient's ability to take care of themselves, enhancing their confidence in rehabilitation, and playing a positive role in promoting the overall rehabilitation process. At the same time, adjusting the length of the telescopic rod can make the scratching component touch the skin of various parts of the human body, expanding the scope of use. In addition, the overall structure does not require electric drive, and the cost is low. It can relieve itching while also exercising hand strength. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A perspective view of the present invention;

[0020] Figure 2 is a three-dimensional schematic diagram of the scratching component of the present invention;

[0021] Figure 3 This is a three-dimensional diagram of the scratching component of the present invention with the housing removed;

[0022] Figure 4 For the present invention Figure 3 A partial enlarged schematic diagram;

[0023] Figure 5 A schematic diagram of a partial explosion and decomposition of the tickling component of the present invention;

[0024] Figure 6 A plan view of the manual drive assembly of the present invention;

[0025] Figure 7 is a perspective view of the manual drive assembly of the present invention;

[0026] Figure 8 For the present invention Figure 7 A partial enlarged schematic diagram of B in the middle.

[0027] Among them: 1. Tickling assembly; 11. Shell; 12. Shelf member; 13. Bottom shell; 14. Foot rod; 15. Ring bracket; 16. Main gear; 17. Branch gear; 18. Transmission gear; 19. No. 1 bevel gear; 110. Inclined frustum; 111. Hemispherical rotating part; 1111. Rotating part body; 1112. Limit cover; 1113. Steel ball; 112. Tickling ball head; 2. Manual drive assembly; 21. Telescopic rod; 22. Sleeve rod; 23. Extension rod; 24. No. 2 bevel gear; 25. No. 3 bevel gear; 26. Arc shell; 27. Drive gear; 28. Connecting rod; 29. Pinion; 210. No. 4 bevel gear; 211. Ear block; 212. Pressure rod; 213. Handle; 3. Dustproof bottom support cover. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention 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 making creative efforts are within the scope of protection of the present invention.

[0029] See also Figure 1-Figure 5 The present invention provides a patient itch reliever, including a tickling assembly 1, which includes a shell 11, a layer plate 12 is clamped at the bottom of the shell 11, the bottom of the layer plate 12 is connected to the bottom shell 13 by screws, and the inside of the layer plate 12 is integrally connected to a foot rod 14, the top of the foot rod 14 is connected to an annular bracket 15 by screws, the inside of the annular bracket 15 is rotatably connected to the rotating shaft of the main gear 16, the sub-gear 17 and the transmission gear 18, the top of the rotating shaft of the main gear 16 is fixedly connected to the first bevel gear 19, the bottom surface of the transmission gear 18 is fixedly connected to an inclined circular table 110, the inclined surface of the inclined circular table 110 is in rolling contact with a hemispherical rotating part 111, and the bottom of the hemispherical rotating part 111 is clamped with a tickling ball head 112;

[0030] For the specific structure of the manual drive assembly 2, please refer to Figure 6-Figure 8It includes a telescopic rod 21, a sleeve rod 22 is fitted on the inner wall of the telescopic rod 21, an extension rod 23 is slidably connected to the inside of the sleeve rod 22, one end of the extension rod 23 is fixedly connected to the No. 2 bevel gear 24, one end of the sleeve rod 22 is fixedly connected to the No. 3 bevel gear 25, one end of the telescopic rod 21 is threadedly connected to the arc-shaped shell 26, a driving gear 27 is rotatably connected to the inner wall of the arc-shaped shell 26, a connecting rod 28 is rotatably connected to the end surface of the driving gear 27, and the driving gear 27 is meshed with a pinion 29, a No. 4 bevel gear 210 is fixedly connected to the end surface of the pinion 29, one end of the connecting rod 28 is hinged with an ear block 211, one end of the ear block 211 is fixedly connected to a pressure rod 212, and one side of the arc-shaped shell 26 is fixedly connected to a handle 213.

[0031] Furthermore, there is one main gear 16 and one sub-gear 17, and the main gear 16 and the sub-gear 17 are meshed with each other. Four transmission gears 18 are arranged in an array in the axial direction of the layer plate member 12, and two of the transmission gears 18 are meshed and connected with the main gear 16, and the other two transmission gears 18 are meshed and connected with the sub-gear 17.

[0032] Furthermore, the upper surface of the layer plate member 12 is integrally connected with four foot rods 14 around its axial direction, and the lower surface of the layer plate member 12 is arrayed with four circular grooves around its axial direction, and an inclined cone 110 is inserted into each of the four circular grooves, and an arc groove is provided on the inclined surface of the inclined cone 110.

[0033] Furthermore, the hemispherical rotating part 111 includes a rotating part body 1111, a limiting cover 1112 and a steel ball 1113. The top of the rotating part body 1111 is connected to the limiting cover 1112 by screws, and the steel ball 1113 is in rolling contact between the rotating part body 1111 and the limiting cover 1112.

[0034] Furthermore, four hemispherical grooves are opened on the upper surface of the rotating part body 1111 around its axial direction, and four annular grooves are opened on the end surface of the limit cover 1112 around its axial direction. The hemispherical grooves and the annular grooves are connected, and the hemispherical grooves and the annular grooves are in rolling contact with the steel balls 1113. Four through grooves are opened on the lower surface of the bottom shell 13, and the through grooves are in rolling contact with the rotating part body 1111.

[0035] Furthermore, a telescopic rod 21 is threadedly connected to the outer wall of the shell 11, and a plurality of conical protrusions are fixedly connected to the outer surface of the tickling ball head 112. The tickling ball head 112 is made of silicone, and the hardness of the tickling ball head 112 is Shore A 20-30 degrees.

[0036] When the first bevel gear 19 rotates, it will drive the main gear 16 to rotate together. Since the main gear 16 and the sub-gear 17 are meshed with each other, the rotation of the main gear 16 will drive the sub-gear 17 to rotate, and the two rotation directions are opposite, and the main gear 16 drives the two transmission gears 18 meshed with it to rotate, and the sub-gear 17 drives the other two transmission gears 18 to rotate, so that the four transmission gears 18 can all rotate, and the transmission gear 18 drives the inclined plane truncated cone 110 to rotate. An arc groove is provided on the inclined surface of the inclined plane truncated cone 110 to roll in contact with the steel ball 1113, which will force the rotating part body 1111 to roll in the through groove of the bottom shell 13. By arranging the steel ball 1113, the friction resistance can be reduced. By arranging the annular groove on the limit cover 1112 and the hemispherical groove on the rotating part body 1111, the two can cooperate to limit the position of the steel ball 1113. When the rotating part body 1111 is driven to roll, it will drive the tickling ball head 112 to roll, 2. It is lightly fitted to the outer surface of the skin. In this way, during the rotation of the tickling ball head 112, the multiple conical protrusions on its outer surface can better contact the skin, play a tickling role, and thus relieve the itching sensation of leprosy patients. Since the tickling ball head 112 is made of silicone with a hardness between Shore A20-30, this hardness of silicone is relatively mild and can meet the tickling needs while protecting the patient's skin to the greatest extent. For leprosy patients, due to damaged nerve endings, the sensory function of the skin is disordered, and their perception of touch is different from that of normal people. The special touch provided by the tickling ball head 112 with a Shore A hardness of 20-30 can not only allow patients to feel the stimulation of tickling and help relieve the itching, but also will not cause patients to be disgusted by excessively strong or uncomfortable touch. The tickling ball head 112 can be detached from the rotating part body 1111 for easy cleaning. When not in use, the dust-proof bottom support cover 3 can be placed on the bottom shell 13 to prevent the tickling ball head 112 from contacting dust.

[0037] Furthermore, a cover plate is connected to the outer surface of the arc-shaped housing 26 by screws, the first bevel gear 19 is meshed with the second bevel gear 24 , and the third bevel gear 25 is meshed with the fourth bevel gear 210 .

[0038] Furthermore, an arcuate groove for the connecting rod 28 to pass through is opened on the outer wall of the arcuate shell 26 , one end of the pressure rod 212 is hinged to the outer wall of the arcuate shell 26 , and the pinion 29 is rotatably connected to the inner wall of the arcuate shell 26 .

[0039] Furthermore, a sliding key is fixedly connected to the outer wall of the extension rod 23, and a sliding groove is provided on the inner wall of the sleeve rod 22. The sliding key slides in cooperation with the sliding groove. The end of the extension rod 23 away from the sliding key is fixedly connected to the No. 1 bevel tooth 19, and the outer surface of the bottom shell 13 is clamped with a dustproof bottom support cover 3.

[0040] The user holds the handle 213 to operate. When the pressure rod 212 is pressed, the pressure rod 212 rotates around the hinge point between it and the arc-shaped shell 26. Since one end of the connecting rod 28 is hinged on the ear block 211 of the pressure rod 212 and the other end is rotatably connected to the end face of the driving gear 27, the rotation of the pressure rod 212 drives the driving gear 27 to rotate on the inner wall of the arc-shaped shell 26 through the connecting rod 28. The arc groove on the outer wall of the arc-shaped shell 26 provides movement space for the connecting rod 28 to ensure its smooth movement. Since the driving gear 27 is meshed with the pinion 29, the driving gear 27 rotates and drives the pinion 29 to rotate. The rotation of the pinion 29 causes the fourth bevel gear 210 to rotate synchronously. After the fourth bevel gear 210 rotates, it drives the third bevel gear 25 to rotate, thereby driving the sleeve rod 22 to rotate. The sleeve rod 22 drives the extension rod 23 to rotate. The extension rod 23 drives the second bevel gear 24 to rotate. The second bevel gear 24 drives the first bevel gear 19 to rotate. In this way, the manual drive assembly 2 can be driven When the tickling component 1 is in operation, the overall structure can achieve tickling without the aid of power components such as motors, and the telescopic rod 21 can be extended by pulling the telescopic rod 21, and the total length of the sleeve rod 22 and the extension rod 23 inside it will be lengthened. On the contrary, when the length of the telescopic rod 21 is shortened, the total length of the sleeve rod 22 and the extension rod 23 will also be shortened. By adjusting the length of the telescopic rod 21, the tickling component 1 can easily touch the skin of various parts of the human body, expand the scope of use, and enhance the user experience; since the manual drive component 2 requires leprosy patients to move their fingers during operation, and leprosy patients have hand nerve damage, which is often accompanied by hand tactile disorders, when operating the manual drive component 2, the grasping, pressing, and flicking of the fingers can stimulate the nerve endings of the hand, promote nerve repair and regeneration, enhance hand muscle strength, improve hand joint flexibility and coordination, gradually restore the hand's fine motor skills, improve the patient's ability to take care of themselves, enhance their confidence in rehabilitation, and play a positive role in promoting the overall rehabilitation process.

[0041] When in use, the user first holds the handle 213 and repeatedly presses the pressure rod 212 with his fingers. The pressure rod 212 rotates around the hinge point between it and the arc-shaped shell 26, and drives the driving gear 27 to rotate on the inner wall of the arc-shaped shell 26 through the connecting rod 28. The driving gear 27 drives the small gear 29 meshing with it to rotate, and the small gear 29 drives the fourth bevel gear 210 to rotate, and then drives the third bevel gear 25 to rotate, drives the sleeve rod 22 to rotate, the sleeve rod 22 drives the extension rod 23 to rotate, the extension rod 23 drives the second bevel gear 24 to rotate, and the second bevel gear 24 drives the first bevel gear 19 to rotate; the rotation of the first bevel gear 19 drives the main gear 16 to rotate, and the main gear 16 drives the sub-gear 17 to rotate , the two rotate in opposite directions, and at the same time, the main gear 16 and the sub-gear 17 respectively drive the two transmission gears 18 meshing therewith to rotate, and the four transmission gears 18 drive the inclined circular table 110 to rotate; the arc groove on the inclined surface of the inclined circular table 110 rolls with the steel ball 1113, forcing the rotating part body 1111 to roll in the through groove of the bottom shell 13, driving the tickling ball head 112 to roll, and by slightly fitting the tickling ball head 112 to the outer surface of the skin, the multiple conical protrusions on its outer surface contact the skin to achieve a tickling effect; by pulling the telescopic rod 21, its length can be adjusted, and the total length of the sleeve rod 22 and the extension rod 23 can be changed, so that the tickling component 1 can touch the skin of various parts of the human body.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A patient itch relief device, characterized in that: include, The tickling assembly (1) comprises a shell (11), the bottom of the shell (11) is clamped with a layer plate member (12), the bottom of the layer plate member (12) is connected to a bottom shell (13) by screws, and the inside of the layer plate member (12) is integrally connected with a foot rod (14), the top of the foot rod (14) is connected to an annular bracket (15) by screws, the inside of the annular bracket (15) is rotatably connected to the rotating shaft of a main gear (16), a sub-gear (17) and a transmission gear (18), the top of the rotating shaft of the main gear (16) is fixedly connected to a No. 1 bevel gear (19), the bottom surface of the transmission gear (18) is fixedly connected to an inclined plane truncated cone (110), the inclined surface of the inclined plane truncated cone (110) is in rolling contact with a hemispherical rotating member (111), and the bottom of the hemispherical rotating member (111) is clamped with a tickling ball head (112); The manual drive assembly (2) comprises a telescopic rod (21), a sleeve rod (22) is fitted on the inner wall of the telescopic rod (21), an extension rod (23) is slidably connected inside the sleeve rod (22), one end of the extension rod (23) is fixedly connected to a second bevel gear (24), one end of the sleeve rod (22) is fixedly connected to a third bevel gear (25), one end of the telescopic rod (21) is threadedly connected to an arc-shaped shell (26), and the inner wall of the arc-shaped shell (26) is rotated. A driving gear (27) is connected, a connecting rod (28) is rotatably connected to the end surface of the driving gear (27), and the driving gear (27) is meshed with a pinion (29), a fourth bevel gear (210) is fixedly connected to the end surface of the pinion (29), one end of the connecting rod (28) is hinged with an ear block (211), one end of the ear block (211) is fixedly connected to a pressure rod (212), and one side of the arc-shaped housing (26) is fixedly connected to a handle (213).

2. The patient itch relief device according to claim 1, characterized in that: The main gear (16) and the sub-gear (17) are each provided with one, and the main gear (16) and the sub-gear (17) are meshed with each other. The transmission gears (18) are arranged in an array in the axial direction of the layer plate member (12), and two of the transmission gears (18) are meshed with the main gear (16), and the other two of the transmission gears (18) are meshed with the sub-gear (17).

3. The patient itch relief device according to claim 1, characterized in that: The upper surface of the layer plate member (12) is integrally connected with four foot rods (14) around its axial direction, and the lower surface of the layer plate member (12) is arrayed with four circular grooves around its axial direction, and an inclined cone (110) is inserted into each of the four circular grooves, and an arc groove is provided on the inclined surface of the inclined cone (110).

4. The patient itch relief device according to claim 1, characterized in that: The hemispherical rotating part (111) comprises a rotating part body (1111), a limiting cover (1112) and a steel ball (1113); the top of the rotating part body (1111) is connected to the limiting cover (1112) via a screw; and the steel ball (1113) is in rolling contact between the rotating part body (1111) and the limiting cover (1112).

5. The patient itch relief device according to claim 4, characterized in that: The upper surface of the rotating member body (1111) is provided with four hemispherical grooves around its axial direction, and the end surface of the limiting cover (1112) is provided with four annular grooves around its axial direction. The hemispherical grooves and the annular grooves are connected, and the hemispherical grooves and the annular grooves are in rolling contact with the steel balls (1113). The lower surface of the bottom shell (13) is provided with four through grooves, and the through grooves are in rolling contact with the rotating member body (1111).

6. The patient itch relief device according to claim 1, characterized in that: A telescopic rod (21) is threadedly connected to the outer wall of the shell (11); a plurality of conical protrusions are fixedly connected to the outer surface of the tickling ball head (112); the tickling ball head (112) is made of silicone material, and the hardness of the tickling ball head (112) is Shore A 20-30 degrees.

7. The patient itch relief device according to claim 1, characterized in that: The outer surface of the arc-shaped housing (26) is connected to a cover plate via screws, the first bevel gear (19) is meshed with the second bevel gear (24), and the third bevel gear (25) is meshed with the fourth bevel gear (210).

8. The patient itch relief device according to claim 1, characterized in that: An arcuate groove for the connecting rod (28) to pass through is provided on the outer wall of the arcuate housing (26); one end of the pressure rod (212) is hinged to the outer wall of the arcuate housing (26); and the pinion (29) is rotatably connected to the inner wall of the arcuate housing (26).

9. The patient itch relief device according to claim 1, characterized in that: A sliding key is fixedly connected to the outer wall of the extension rod (23), a sliding groove is provided on the inner wall of the sleeve rod (22), the sliding key and the sliding groove are slidably matched, and the end of the extension rod (23) away from the sliding key is fixedly connected to a No. 1 bevel tooth (19), and the outer surface of the bottom shell (13) is clamped with a dustproof bottom support cover (3).

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