Nursing bed for animal husbandry and veterinary medicine

Abstract

The utility model belongs to the technical field of animal husbandry and veterinary equipment, and particularly relates to an animal husbandry and veterinary nursing bed which comprises a bed board, and the bed board is connected with the front side and the rear side of a base assembly in a clamped mode through two limiting holes formed in the front end and the rear end of the bed board respectively. Through the cooperation of the limiting bolts, the first springs and the mounting frame, the bed board can be quickly mounted and fixed; then, under the mutual cooperation of an L-shaped clamping block, a first inserting rod, a second inserting rod, a first shifting plate, a second shifting plate, a first bottom mounting plate, a second bottom mounting plate, an internal thread sleeve, a vertical rod, a first sleeve and a second sleeve, the two first protection frames and the two second protection frames can be quickly mounted and fixed to the upper end of the bed board; therefore, the device is convenient to mount and dismount, and the situation that an existing nursing bed device is inconvenient to mount and dismount in the using process, and consequently transportation of the device is troublesome is effectively avoided.

Description

Technical Field

[0001] The utility model belongs to the technical field of livestock and veterinary medical equipment, and particularly relates to a livestock and veterinary medical nursing bed. Background Art

[0002] Animal husbandry refers to the use of animals such as livestock and poultry that have been artificially raised and domesticated by humans. In current animal husbandry during the artificial rearing of animals, a nursing bed is required during the rearing process of young animals.

[0003] Problems existing in the prior art:

[0004] During the use of the existing livestock and veterinary medical nursing beds, it is inconvenient to collect the dirt generated during the rearing of livestock, which affects the environment around the nursing bed. At the same time, the installation and disassembly processes of the existing nursing beds are mostly inconvenient, resulting in a troublesome transportation process for the nursing beds. Content of the Utility Model

[0005] The purpose of the utility model is to provide a livestock and veterinary medical nursing bed, which can solve the problems that during the use of the existing livestock and veterinary medical nursing beds, it is inconvenient to collect the dirt generated during the rearing of livestock, which affects the environment around the nursing bed, and at the same time, the installation and disassembly processes of the existing nursing beds are mostly inconvenient, resulting in a troublesome transportation process for the nursing beds.

[0006] The technical solution adopted by the utility model is specifically as follows:

[0007] A livestock and veterinary medical nursing bed includes a bed board. The bed board is respectively clamped with the front and rear sides of a base assembly through two limiting holes respectively opened in the inner parts of its front and rear ends. Dirt collection boxes are arranged on both the left and right sides of the base assembly. Two protection components one and two protection components two are lapped on the upper end of the bed board. The two protection components one and the two protection components two are respectively clamped with four L-shaped blocks. The two protection components one and the two protection components two are respectively sleeved with eight vertical rods. The eight vertical rods are respectively threadedly connected with eight internal thread sleeves through the threaded structures arranged at their lower ends. The lower ends of the eight internal thread sleeves are respectively fixedly connected with the four L-shaped blocks.

[0008] The lower ends of the four L-shaped blocks are respectively fixedly connected to the four corners of the upper end of the bed board. A guiding frame is fixedly connected to the upper end of the bed board. A number of leakage holes are opened in the bed board.

[0009] The base assembly includes a bottom plate, which is fixedly connected to the lower end of the collecting frame through a plurality of fixing plates arranged at its upper end, guide holes are provided on the left and right sides of the lower end of the collecting frame, a push plate is overlapped on the inner bottom surface of the collecting frame, and two L-shaped plates are fixedly connected to the upper end of the push plate, a threaded block is fixedly connected to the L-shaped plate on the rear side, and the threaded block is threadedly connected to the reciprocating screw.

[0010] The left and right sides of the reciprocating screw are movably connected to the left and right sides of the collecting frame respectively, the left end of the reciprocating screw is fixedly connected to sprocket one, the sprocket one is transmission connected to sprocket two through a set chain, the sprocket two is fixedly connected to the output shaft of the reciprocating motor, the lower end of the reciprocating motor is fixedly connected to the bottom plate, and a support block is fixedly connected to the L-shaped plate on the front side, and the support block is slidably connected to the fixed rod.

[0011] The left and right ends of the fixing rod are respectively fixedly connected to the left and right sides of the collecting frame; the bottom plate is fixedly connected to the two mounting frames through a plurality of fixing columns arranged on the front and rear sides of its upper end; the two mounting frames are respectively clamped with the front and rear ends of the bed board; two limiting latches are arranged on the two mounting frames; four limiting latches are sleeved with a spring 1; the four limiting latches are clamped with the bed board with four limiting holes provided inside; the bottom plate is overlapped with the lower ends of the two dirt collection boxes through the placement grooves provided on the left and right sides of its upper end.

[0012] The two protection components each include a bottom mounting plate, the lower ends of the two bottom mounting plates are overlapped on the upper end of the bed board, the upper ends of the two bottom mounting plates are fixedly connected to a protection frame, and the left and right ends of the two protection frames are fixedly connected to a sleeve.

[0013] The four sleeves are respectively sleeved with the corresponding four vertical rods, and the two bottom mounting plates are provided with square grooves on both sides. The four square grooves are movably connected with a toggle plate, and the relatively close ends of the four toggle plates are fixedly connected with a telescopic sleeve rod.

[0014] The four telescopic sleeve rods are all sleeved with springs 2, the relatively close ends of the four telescopic sleeve rods are respectively fixedly connected to the relatively close surfaces inside the four square grooves 1, the relatively far ends of the four toggle plates 1 are all fixedly connected with insertion rods 1, and the relatively far ends of the four insertion rods 1 pass through the four square grooves 1 and are respectively clamped with four L-shaped blocks.

[0015] Both of the two protection components II include bottom mounting plates II. The lower ends of the two bottom mounting plates II are both lapped on the upper end of the bed board. The upper ends of the two bottom mounting plates II are both fixedly connected with protection frames II. The front and rear ends of the two protection frames II are both fixedly connected with sleeves II. The four sleeves II are respectively sleeved with the corresponding four vertical rods. Square grooves II are formed in the front and rear sides inside the two bottom mounting plates II.

[0016] A shifting plate II is movably connected inside each of the four square grooves II. The relatively far ends of the four shifting plates II are all fixedly connected with telescopic sleeve rods II. Spring III is sleeved on each of the four telescopic sleeve rods II. The relatively close ends of the four telescopic sleeve rods II are respectively fixedly connected to the relatively close surfaces inside the four square grooves II. The relatively far ends of the four shifting plates II are all fixedly connected with insertion rods II. The relatively far ends of the four insertion rods II respectively pass through the four square grooves II and are respectively clamped with four L-shaped clamping blocks.

[0017] The technical effects achieved by the present utility model are as follows:

[0018] Through the cooperation of the limit pin, spring I and the mounting frame provided by the present utility model, the installation and fixation effect of the bed board can be quickly achieved. Then, through the mutual cooperation among the L-shaped clamping block, insertion rod I, insertion rod II, shifting plate I, shifting plate II, bottom mounting plate I, bottom mounting plate II, internal thread sleeve, vertical rod, sleeve I and sleeve II, the two protection frames I and the two protection frames II can be quickly installed and fixed on the upper end of the bed board, thereby making the installation and disassembly processes of the device relatively convenient, effectively avoiding the situation that the existing nursery bed device is inconvenient in the installation and disassembly process during use, resulting in relatively troublesome transportation of the device. Through the mutual cooperation among the reciprocating motor, reciprocating lead screw, sprocket I, sprocket II, L-shaped plate, support block, fixed rod and threaded block, the push plate can be driven to move left and right inside the collection box, and thus the dirt falling into the collection box can be respectively pushed into the two dirt collection boxes through the two guiding holes formed at the bottom of the collection box, so as to facilitate the collection of the dirt generated during the breeding process of livestock and facilitate subsequent centralized treatment. Description of the Drawings

[0019] Figure 1 is the front view three-dimensional structure schematic diagram of the present utility model;

[0020] Figure 2 is the left view three-dimensional structure schematic diagram of the present utility model;

[0021] Figure 3 is the front view three-dimensional structure schematic diagram of the bed board of the present utility model;

[0022] Figure 4It is a right-side sectional three-dimensional structural schematic diagram of the base assembly in the utility model;

[0023] Figure 5 It is a rear view stereoscopic structural diagram of the base assembly in the utility model;

[0024] Figure 6 It is a schematic diagram of the main three-dimensional structure of the protection component in the utility model;

[0025] Figure 7 It is a left-side stereoscopic structural schematic diagram of the second protective component in the utility model.

[0026] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0027] 1. Bed board; 2. Dirt collection box; 3. Base assembly; 31. Bottom plate; 32. Fixed rod; 33. Support block; 34. L-shaped plate; 35. Fixed plate; 36. Push plate; 37. Fixed column; 38. Reciprocating screw; 39. Threaded block; 310. Spring 1; 311. Limiting latch; 312. Mounting frame; 313. Reciprocating motor; 314. Sprocket 2; 315. Sprocket 1; 316. Collection frame; 4. Protective assembly 1; 41. Insert rod 1; 42. A square groove; 43. A toggle plate; 44. Two springs; 45. A telescopic sleeve; 46. A bottom mounting plate; 47. A protective frame; 48. A sleeve; 5. An L-shaped block; 6. An internally threaded sleeve; 7. Two protective components; 71. An insert rod; 72. A square groove; 73. A toggle plate; 74. Two springs; 75. A telescopic sleeve; 76. A bottom mounting plate; 77. A protective frame; 78. A sleeve; 8. A vertical rod; 9. A guide frame. DETAILED DESCRIPTION

[0028] In order to make the purpose and advantages of the utility model more clear, the utility model is specifically described in combination with the following embodiments. It should be understood that the following text is only used to describe one or several specific implementations of the utility model, and does not strictly limit the protection scope of the specific request of the utility model.

[0029] like Figure 1-7As shown in the figure, a nursing bed for livestock veterinarians includes a bed board 1. The bed board 1 is clamped to the front and rear sides of the base assembly 3 through two limit holes respectively opened inside the front and rear ends thereof. Dirt collection boxes 2 are arranged on the left and right sides of the base assembly 3. Two protection components one 4 and two protection components two 7 are lapped on the upper end of the bed board 1. The two protection components one 4 and the two protection components two 7 are respectively clamped to four L-shaped blocks 5. The two protection components one 4 and the two protection components two 7 are respectively sleeved on eight vertical rods 8. The eight vertical rods 8 are respectively threadedly connected to eight internal thread sleeves 6 through the threaded structures arranged at their lower ends. The lower ends of the eight internal thread sleeves 6 are respectively fixedly connected to the four L-shaped blocks 5. By arranging the base assembly 3, the installation and fixation effect of the bed board 1 can be quickly achieved. Through the cooperation of the arranged L-shaped blocks 5 and the vertical rods 8, the two protection components one 4 and the two protection components two 7 can be quickly installed and fixed to the upper end of the bed board 1, thereby making the installation and disassembly process of the device more convenient. By arranging the two protection components one 4 and the two protection components two 7, the livestock on the bed board 1 can be protected. The lower ends of the four L-shaped blocks 5 are respectively fixedly connected to the four corners of the upper end of the bed board 1. A guiding frame 9 is fixedly connected to the upper end of the bed board 1. A number of leakage holes are opened inside the bed board 1. The dirt generated by the livestock on the bed board 1 will enter the inside of the base assembly 3 through the leakage holes of the bed board 1, and then the base assembly 3 can guide the dirt into the two dirt collection boxes 2 respectively, thereby facilitating the collection and treatment of the dirt generated by the livestock.

[0030] Furthermore, the base assembly 3 includes a bottom plate 31, which is fixedly connected to the lower end of the collection frame 316 through a plurality of fixing plates 35 arranged at its upper end. Guide holes are provided on the left and right sides of the lower end of the collection frame 316. A push plate 36 is overlapped on the inner bottom surface of the collection frame 316. The upper end of the push plate 36 is fixedly connected to two L-shaped plates 34. A threaded block 39 is fixedly connected to the rear L-shaped plate 34. The threaded block 39 is threadedly connected to the reciprocating screw 38. The left and right sides of the reciprocating screw 38 are movably connected to the left and right sides of the collection frame 316 respectively. The left end of the reciprocating screw 38 is fixedly connected to a sprocket wheel 315. The sprocket wheel 315 is provided with a plurality of fixing plates 35 arranged at its upper end. The chain is connected to the second sprocket 314 for transmission, the second sprocket 314 is fixedly connected to the output shaft of the reciprocating motor 313, the lower end of the reciprocating motor 313 is fixedly connected to the bottom plate 31, the front L-shaped plate 34 is fixedly connected with a support block 33, the support block 33 is slidably connected to the fixed rod 32, the left and right ends of the fixed rod 32 are respectively fixedly connected to the left and right sides of the collection frame 316, the bottom plate 31 is fixedly connected to the two mounting frames 312 through a plurality of fixing columns 37 arranged on the front and rear sides of its upper end, and the two mounting frames 312 are respectively clamped with the front and rear ends of the bed board 1, and two limit latches 33 are arranged on the two mounting frames 312. 11, four limit pins 311 are all sleeved with springs 1 310, and the four limit pins 311 are all clamped with the bed board 1 with four limit holes inside. The bottom plate 31 is overlapped with the lower ends of the two dirt collection boxes 2 through the placement grooves on the left and right sides of its upper end. The dirt produced by livestock on the bed board 1 will fall into the inside of the collection frame 316 through the leakage holes on the bed board 1. At this time, the reciprocating motor 313 is started to drive the sprocket wheel 2 314 to rotate. The rotation of the sprocket wheel 2 314 can achieve the effect of driving the reciprocating screw 38 to rotate under the action of the set sprocket wheel 1 315, and the rotation of the reciprocating screw 38 on the set screw The cooperation between the pattern block 39 and the rear L-shaped plate 34 can drive the push plate 36 to move in the left and right directions, and then the dirt that falls into the collection frame 316 can be pushed to the inside of the dirt collection box 2 through the two guide holes opened at the bottom of the collection frame 316, so as to facilitate the subsequent centralized collection and treatment of the dirt. The mutual cooperation between the set fixing rod 32, the support block 33 and the front L-shaped plate 34 can increase the stability of the push plate 36 during the left and right movement. The mutual cooperation between the set installation frame 312, the limit pin 311 and the spring 1 310 can quickly achieve the installation and fixing effect of the bed board 1.

[0031] Furthermore, the two protection components 4 each include a bottom mounting plate 46, the lower ends of the two bottom mounting plates 46 are overlapped on the upper end of the bed board 1, the upper ends of the two bottom mounting plates 46 are fixedly connected to a protection frame 47, the left and right ends of the two protection frames 47 are fixedly connected to a sleeve 48, and the four sleeves 48 are respectively sleeved with the corresponding four vertical rods 8, and the left and right sides of the two bottom mounting plates 46 are provided with a square groove 42, and the inside of the four square grooves 42 are movably connected to a toggle plate 43, and the relatively close ends of the four toggle plates 43 are fixedly connected to a telescopic sleeve rod 45, and the four telescopic sleeve rods 45 are sleeved with a spring 244, and the relatively close ends of the four telescopic sleeve rods 45 are respectively fixedly connected to the relatively close ends of the four square grooves 42. On the surface, the relatively distant ends of the four toggle plates 43 are fixedly connected with the insertion rod 41, and the relatively distant ends of the four insertion rods 41 respectively pass through the four square grooves 42 and are respectively engaged with the four L-shaped blocks 5. Through the cooperation between the set L-shaped blocks 5, vertical rods 8, sleeves 48 and insertion rods 41, the installation and fixing process of the bottom mounting plate 46 and the protective frame 47 can be quickly achieved, and the corresponding two toggle plates 43 are driven to approach each other, and then the four insertion rods 41 are driven to approach each other, so that the four insertion rods 41 are no longer engaged with the four L-shaped blocks 5, and then the protective frame 47 is pulled upwards, so that the four sleeves 48 are no longer engaged with the four corresponding vertical rods 8. At this time, the disassembly process of the two protective components 4 after the use of the device is completed.

[0032] The two protection components II-7 both include bottom mounting plates II-76. The lower ends of the two bottom mounting plates II-76 are both lapped on the upper end of the bed board 1. The upper ends of the two bottom mounting plates II-76 are both fixedly connected with protection frames II-77. The front and rear ends of the two protection frames II-77 are both fixedly connected with sleeves II-78. The four sleeves II-78 are respectively sleeved on the corresponding four vertical rods 8. Square grooves II-72 are respectively opened on the front and rear sides inside the two bottom mounting plates II-76. Stirring plates II-73 are movably connected inside the four square grooves II-72. Telescopic sleeve rods II-75 are fixedly connected to the relatively far ends of the four stirring plates II-73. Spring III-74 is sleeved on each of the four telescopic sleeve rods II-75. The relatively close ends of the four telescopic sleeve rods II-75 are respectively fixedly connected to the relatively close surfaces inside the four square grooves II-72. Plug rods II-71 are fixedly connected to the relatively far ends of the four stirring plates II-73. The relatively far ends of the four plug rods II-71 respectively pass through the four square grooves II-72 and are respectively clamped with the four L-shaped clamping blocks 5. Through the cooperation among the L-shaped clamping blocks 5, the vertical rods 8, the sleeves II-78 and the plug rods II-71, the installation and fixation process of the bottom mounting plates II-76 and the protection frames II-77 can be quickly achieved. By driving the corresponding two stirring plates II-73 to approach each other, the four plug rods II-71 are further driven to approach each other, so that the four plug rods II-71 are no longer clamped with the four L-shaped clamping blocks 5. Then, the protection frame II-77 is pulled upward, so that the four sleeves II-78 are no longer sleeved on the corresponding four vertical rods 8. At this time, the disassembly process of the two protection components II-7 after the use of the device can be achieved.

[0033] The working principle of the present utility model is as follows:

[0034] During the use of the device, the livestock waste generated will fall into the interior of the collection box 316 through the leakage holes on the bed board 1. At this time, start the reciprocating motor 313 to drive the sprocket two 314 to rotate, and then, with the cooperation of the set sprocket one 315, it can drive the reciprocating lead screw 38 to rotate. Through the rotation of the reciprocating lead screw 38, with the cooperation of the set L-shaped plate 34, support block 33, threaded block 39 and fixed rod 32, the push plate 36 can be driven to move left and right in the interior of the collection box 316, and then the waste in the interior of the collection box 316 can be respectively guided into the interiors of the two waste collection boxes 2 through the two guiding holes opened at the bottom of the collection box 316, thus facilitating subsequent centralized treatment. When the device needs to be disassembled after use, drive the corresponding two toggle plates one 43 and the corresponding two toggle plates two 73 to approach each other, so that the four inserting rods one 41 and the four inserting rods two 71 are no longer engaged with the four L-shaped clamping blocks 5. Then, by pulling the two protective frames one 47 and the two protective frames two 77 upward to move a certain height, at this time, the disassembly process of the two protective components one 4 and the two protective components two 7 can be achieved. After the disassembly of the protective component one 4 and the protective component two 7 is realized, rotate the eight vertical rods 8 and remove them from the bed board 1. Then, by pulling the four limit pins 311 downward so that they are no longer engaged with the bed board 1, and then pulling the bed board 1 left or right to pull it out from the interiors of the two mounting frames 312, at this time, the bed board 1 can be removed from the device, thus achieving the disassembly process of the device, effectively reducing the occupied space of the device and facilitating the transportation of the device.

[0035] The above is only the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention. The structures, devices and operation methods not specifically described and explained in the present invention, unless otherwise specified and limited, are implemented according to the conventional means in this field.

Claims

1. A livestock veterinary conservation bed, comprising a bed board (1), characterized in that: The bed board (1) is respectively clamped with the front and rear sides of the base assembly (3) through two limiting holes provided inside the front and rear ends thereof; the left and right sides of the base assembly (3) are provided with a dirt collection box (2); the upper end of the bed board (1) is overlapped with two protection assemblies one (4) and two protection assemblies two (7); the two protection assemblies one (4) and the two protection assemblies two (7) are respectively clamped with four L-shaped clamping blocks (5); the two protection assemblies one (4) and the two protection assemblies two (7) are respectively sleeved with eight vertical rods (8); the eight vertical rods (8) are respectively threadedly connected with eight internally threaded sleeves (6) through a threaded structure provided at the lower end thereof; the lower ends of the eight internally threaded sleeves (6) are respectively fixedly connected with the four L-shaped clamping blocks (5).

2. The livestock and veterinary care bed according to claim 1, characterized in that: The lower ends of the four L-shaped blocks (5) are respectively fixedly connected to the four corners of the upper end of the bed board (1); the upper end of the bed board (1) is fixedly connected to a guide frame (9); and a plurality of leakage holes are opened inside the bed board (1).

3. A livestock veterinary conservation bed according to claim 1, characterized in that: The base assembly (3) comprises a bottom plate (31), the bottom plate (31) being fixedly connected to the lower end of a collecting frame (316) via a plurality of fixing plates (35) arranged at the upper end thereof, guide holes being provided on both the left and right sides of the lower end of the collecting frame (316), a push plate (36) being overlapped on the inner bottom surface of the collecting frame (316), the upper end of the push plate (36) being fixedly connected to two L-shaped plates (34), a threaded block (39) being fixedly connected to the rear side of the L-shaped plate (34), and the threaded block (39) being threadedly connected to a reciprocating screw (38).

4. The livestock veterinary conservation bed according to claim 3, characterized in that: The left and right sides of the reciprocating screw (38) are movably connected to the left and right sides of the collecting frame (316) respectively; the left end of the reciprocating screw (38) is fixedly connected to a sprocket wheel (315); the sprocket wheel (315) is transmission-connected to a sprocket wheel (314) via a set chain; the sprocket wheel (314) is fixedly connected to an output shaft of a reciprocating motor (313); the lower end of the reciprocating motor (313) is fixedly connected to a bottom plate (31); a support block (33) is fixedly connected to the front L-shaped plate (34); and the support block (33) is slidably connected to a fixed rod (32).

5. The livestock and veterinary conservation bed according to claim 4, characterized in that: The left and right ends of the fixing rod (32) are respectively fixedly connected to the left and right sides of the collection frame (316); the bottom plate (31) is respectively fixedly connected to the two installation frames (312) through a plurality of fixing columns (37) arranged on both the front and rear sides of its upper end; the two installation frames (312) are respectively clamped with the front and rear ends of the bed board (1); two limit pins (311) are arranged on the two installation frames (312); four limit pins (311) are sleeved with springs 1 (310); the four limit pins (311) are clamped with the bed board (1) with four limit holes provided therein; the bottom plate (31) is respectively overlapped with the lower ends of the two waste collection boxes (2) through placement grooves provided on both the left and right sides of its upper end.

6. The livestock veterinary conservation bed according to claim 1, characterized in that: Each of the two protection components one (4) includes a bottom mounting plate one (46). The lower ends of the two bottom mounting plates one (46) are both lapped on the upper end of the bed board (1). The upper ends of the two bottom mounting plates one (46) are both fixedly connected with a protection frame one (47). The left and right ends of the two protection frames one (47) are both fixedly connected with a sleeve one (48).

7. A livestock and veterinary care bed according to claim 6, characterized in that: The four sleeves one (48) are respectively sleeved with the corresponding four vertical rods (8). Square grooves one (42) are respectively opened on the left and right sides inside the two bottom mounting plates one (46). A shifting plate one (43) is movably connected inside each of the four square grooves one (42). The relatively close ends of the four shifting plates one (43) are all fixedly connected with a telescopic sleeve rod one (45).

8. The livestock veterinary conservation bed according to claim 7, characterized in that: Spring two (44) is sleeved on each of the four telescopic sleeve rods one (45). The relatively close ends of the four telescopic sleeve rods one (45) are respectively fixedly connected to the relatively close surfaces inside the four square grooves one (42). The relatively far ends of the four shifting plates one (43) are all fixedly connected with a plug rod one (41). The relatively far ends of the four plug rods one (41) respectively pass through the four square grooves one (42) and are respectively clamped with the four L-shaped blocks (5).

9. The livestock and veterinary care bed according to claim 1, characterized in that: Each of the two protection components two (7) includes a bottom mounting plate two (76). The lower ends of the two bottom mounting plates two (76) are both lapped on the upper end of the bed board (1). The upper ends of the two bottom mounting plates two (76) are both fixedly connected with a protection frame two (77). The front and rear ends of the two protection frames two (77) are both fixedly connected with a sleeve two (78). The four sleeves two (78) are respectively sleeved with the corresponding four vertical rods (8). Square grooves two (72) are respectively opened on the front and rear sides inside the two bottom mounting plates two (76).

10. A livestock veterinary conservation bed according to claim 9, characterized in that: A shifting plate two (73) is movably connected inside each of the four square grooves two (72). The relatively far ends of the four shifting plates two (73) are all fixedly connected with a telescopic sleeve rod two (75). Spring three (74) is sleeved on each of the four telescopic sleeve rods two (75). The relatively close ends of the four telescopic sleeve rods two (75) are respectively fixedly connected to the relatively close surfaces inside the four square grooves two (72). The relatively far ends of the four shifting plates two (73) are all fixedly connected with a plug rod two (71). The relatively far ends of the four plug rods two (71) respectively pass through the four square grooves two (72) and are respectively clamped with the four L-shaped blocks (5).

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