Poultry rearing and feeding apparatus

Abstract

The utility model relates to poultry breeding technical field, and a poultry feeding device, which comprises a ring plate arranged horizontally, a support seat arranged in the ring plate, the ring plate and the support seat are fixedly connected through a plurality of partitions, the plurality of partitions are arranged along the radial direction of the ring plate and separate the ring plate and the support seat into a plurality of feeding positions with the same volume, an adjusting mechanism comprising a driving part arranged in the support seat, a sliding part vertically slidingly arranged in the support seat, a plurality of placing parts vertically slidingly arranged in the plurality of feeding positions one by one, and a plurality of connecting parts connected between the plurality of placing parts and the sliding part one by one, the power output end of the driving part is connected with the sliding part, and each connecting part is free to penetrate through the support seat and slide in the vertical direction, the driving part drives the sliding part to move in the vertical direction, and drives the plurality of placing parts to move synchronously through the plurality of connecting parts, so as to change the volume between the plurality of feeding positions and the plurality of placing parts.

Description

Technical Field

[0001] This utility model relates to the field of poultry farming technology, specifically to a poultry feeding device. Background Technology

[0002] Poultry farming refers to the economic activity of artificially raising poultry such as chickens, ducks, and geese to obtain meat, eggs, and feathers. The process of poultry farming involves key technologies such as breed selection, environmental control, feed management, and disease prevention and control, and requires the combination of scientific management and market trends to improve efficiency.

[0003] In poultry farming, feed feeding is a crucial aspect, as it directly affects the nutritional supply and normal growth of poultry. Currently, most poultry farming methods involve manually scattering feed or directly pouring it into the trough. However, these methods have many drawbacks. Manually scattering feed is not only labor-intensive and inefficient, but also unevenly distributed, easily leading to some poultry overeating while others undereat, affecting the uniformity of poultry growth. On the other hand, directly pouring feed into the trough makes it difficult to accurately control the amount of feed, easily causing feed waste, increasing farming costs, and also potentially causing the feed to spoil due to prolonged accumulation, affecting the health of the poultry. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a poultry feeding device to solve the problems of uneven feeding and difficulty in accurately controlling the amount of feed in the existing poultry feeding methods.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A poultry feeding device, comprising:

[0007] A ring-shaped plate, arranged horizontally;

[0008] A support base is disposed inside an annular plate. The annular plate and the support base are fixedly connected by several partitions. The partitions are arranged radially along the annular plate and divide the annular plate and the support base into several feeding positions with the same volume.

[0009] The adjustment mechanism includes a driving component disposed in a support base, a sliding component vertically slidably disposed in the support base, a placement component vertically slidably disposed in a plurality of feeding positions, and a plurality of connecting components connected between the plurality of placement components and the sliding component. The power output end of the driving component is connected to the sliding component, and each of the connecting components freely passes through the support base and slides in the vertical direction.

[0010] The driving component drives the sliding component to move vertically, and through several connecting components, drives several placement components to move synchronously, thereby changing the volume between several feeding positions and several placement components.

[0011] Compared with the prior art, this utility model has the following beneficial effects: In use, according to the required amount of feed, the drive component is activated to drive the sliding component to move vertically, and through several connecting components, several placement components move synchronously to change the volume between several feeding positions and several placement components. Then, the feed is poured into the placement components in several feeding positions in sequence until the feeding positions are full. The operation is simple and convenient, and the amount of feed can be quickly and accurately adjusted according to the actual situation, without causing feed waste. Moreover, the amount of feed in each feeding position is the same, ensuring the uniformity of feeding and ensuring the uniformity of poultry growth.

[0012] Preferably, the support base includes a double-layered frustum coaxially arranged within an annular plate. The smaller diameter end of the double-layered frustum is arranged upwards, and a sliding groove is formed along the axial direction at the bottom of the larger diameter end of the double-layered frustum. Several strip-shaped through slots are formed on the side wall of the larger diameter end of the double-layered frustum facing its bottom. The several strip-shaped through slots are evenly distributed along the circumference of the larger diameter end of the double-layered frustum. A fixing plate is detachably connected to the bottom of the larger diameter end of the double-layered frustum to close the sliding groove and the several strip-shaped through slots. The sliding member is arranged in the sliding groove, and several connecting members freely pass through the several strip-shaped through slots one by one.

[0013] Preferably, the sliding member includes a sliding column slidably disposed in the sliding groove, the power output end of the driving member is detachably connected to the upper end of the sliding column, and a plurality of connecting members are evenly distributed along the circumference of the sliding column and fixedly connected to the side wall of the sliding column away from the driving member.

[0014] Preferably, each of the connecting members includes a connecting rod that freely passes through the corresponding strip groove, one end of the connecting rod being fixedly connected to the side wall of the sliding column, and the other end being fixedly connected to the corresponding placement object.

[0015] Preferably, each of the aforementioned storage components includes a horizontally arranged storage plate, which is vertically slidably disposed within the corresponding feeding position and fixedly connected to one end of the corresponding connecting rod.

[0016] Preferably, the driving component includes an electric telescopic rod vertically installed at the bottom of the slide groove, and the telescopic end of the electric telescopic rod is detachably connected to the upper end of the sliding column through a connecting plate.

[0017] Preferably, a plurality of baffles are fixedly installed along the axial direction between the small-diameter end and the large-diameter end of the double-layer truncated cone, and the plurality of baffles are arranged one-to-one with the plurality of partitions. An inclined block is fixedly installed between two adjacent baffles, and the inclined surface of the inclined block is inclined downward toward the corresponding feeding position.

[0018] Preferably, a loading cylinder is vertically fixedly installed at the top of the small-diameter end of the double-layer truncated cone. The top of the loading cylinder is provided with a feeding hopper. A sealing plate is rotatably installed on the feeding end of the feeding hopper. The bottom of the loading cylinder has several discharge ports. The discharge ports are evenly distributed along the circumference of the small-diameter end of the double-layer truncated cone and are arranged one-to-one with several inclined blocks. A feeding component is rotatably installed on the bottom of the loading cylinder. The feeding component is rotatably sleeved on the small-diameter end of the double-layer truncated cone. The feeding component has several feeding channels for communicating one-to-one with the several discharge ports.

[0019] Preferably, a fixing block is fixedly installed on the upper part of the side wall away from the double-layer truncated cone of each baffle. The feeding component includes a rotating ring that is rotatably sleeved on the small-diameter end of the double-layer truncated cone and rotatably connected to the bottom of the loading cylinder. Each feeding channel is a through hole opened on the rotating ring. An operating rod is fixedly installed on the side wall of the rotating ring. A positioning component is provided at the lower part of the operating rod. The positioning component is used to engage with any fixing block to fix the position of the rotating ring when the through holes are misaligned with the corresponding feeding port.

[0020] Preferably, each of the fixed blocks has a positioning hole on its upper part, and the lower part of the operating rod near the rotating ring has an installation groove. A pressing block is slidably provided between the inner and outer sides of the installation groove. The pressing block and the bottom of the installation groove are elastically connected by several springs. The thickness of the pressing block on the side near the rotating ring is less than the thickness of the other side. A positioning rod is fixedly installed on the bottom of the side with the smaller thickness of the pressing block. The positioning rod is used to engage with the positioning hole on any of the fixed blocks.

[0021] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of one embodiment of the present invention.

[0023] Figure 2 for Figure 1 A cross-sectional view after removing the loading cylinder and rotating ring.

[0024] Figure 3 for Figure 1 A schematic diagram of the structure of the central support.

[0025] Figure 4 for Figure 3 A bottom view of the large-diameter end of the middle double-layered frustum.

[0026] Figure 5 for Figure 2 Assembly diagram of the sliding parts, connecting parts and placement parts.

[0027] Figure 6 for Figure 1 A schematic diagram of the bottom of the intermediate loading cylinder.

[0028] Figure 7 for Figure 1 Front view of the rotating ring.

[0029] Figure 8 for Figure 1 A magnified view of part I.

[0030] Figure 9 for Figure 1 Assembly diagram of the central operating lever and the fixed block.

[0031] The numbers in the diagram are as follows: 1. Annular plate; 11. Partition plate; 12. Feeding position; 2. Double-layer frustum; 21. Slide groove; 22. Strip groove; 23. Scale; 24. First threaded blind hole; 25. Fixing plate; 3. Sliding column; 31. Connecting rod; 32. Placement plate; 33. Second threaded blind hole; 4. Electric telescopic rod; 41. Connecting plate; 5. Baffle; 51. Inclined block; 52. Fixing block; 53. Positioning hole; 6. Loading cylinder; 61. Feed hopper; 62. Sealing plate; 63. Discharge port; 7. Rotating ring; 71. Through hole; 72. Operating rod; 73. Mounting groove; 74. Pressing block; 75. Positioning rod; 76. Spring. Detailed Implementation

[0032] To make the technical means, creative features, achieved objectives and functions of this utility model clearer and easier to understand, the utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0033] like Figure 1-2 As shown, an embodiment of this utility model provides a poultry feeding device, comprising: an annular plate 1, which is horizontally arranged; a support base, which is disposed within the annular plate 1, wherein the annular plate 1 and the support base are fixedly connected by a plurality of partitions 11, the plurality of partitions 11 being arranged radially along the annular plate 1 and dividing the annular plate 1 and the support base into a plurality of feeding positions 12 with the same volume; and an adjustment mechanism, which includes a driving component disposed within the support base, a sliding component vertically slidably disposed within the support base, a placement component vertically slidably disposed in the plurality of feeding positions 12 corresponding to each other, and a plurality of connecting components corresponding to each of the placement components and the sliding component, wherein the power output end of the driving component is connected to the sliding component, and each of the connecting components freely penetrates the support base and slides in the vertical direction.

[0034] Based on the required amount of feed, the drive unit is activated to move the sliding parts vertically. Through several connecting parts, several placement parts move synchronously to change the volume between several feeding positions 12 and several placement parts. Then, the feed is poured into the placement parts in several feeding positions 12 in sequence until the feeding positions 12 are full. The operation is simple and convenient, and the amount of feed can be quickly and accurately adjusted according to the actual situation without causing feed waste. In addition, the amount of feed in each feeding position 12 is the same, ensuring the uniformity of feeding and the uniformity of poultry growth.

[0035] like Figure 2-4 As shown, according to another embodiment of the present invention, the poultry feeding equipment further optimizes the sliding parts, connecting parts, placing parts, and driving parts included in the equipment. The support base includes a double-layer frustum 2 coaxially arranged in an annular plate 1. The small diameter end of the double-layer frustum 2 is arranged upward. The bottom of the large diameter end of the double-layer frustum 2 is provided with a sliding groove 21 along its axial direction. Several strip-shaped through grooves 22 are provided on the side wall of the large diameter end of the double-layer frustum 2 facing its bottom. The several strip-shaped through grooves 22 are evenly distributed around the circumference of the large diameter end of the double-layer frustum 2. A fixing plate 25 is detachably connected to the bottom of the large diameter end of the double-layer frustum 2 to close the sliding groove 21 and the several strip-shaped through grooves 22. The sliding parts are arranged in the sliding groove 21, and several connecting parts freely pass through the several strip-shaped through grooves 22 one by one.

[0036] The height of the large diameter end of the double-layer frustum 2 is the same as the height of the annular plate 1. Moreover, on the side wall of the large diameter end of the double-layer frustum 2, there are scales 23 on one side of each strip through groove 22 along the length of the strip through groove 22, which can intuitively show the height of the object, thereby realizing the rapid and accurate adjustment of the volume between the feeding position 12 and the corresponding object.

[0037] The bottom of the large-diameter end of the double-layer truncated cone 2 is provided with a number of first threaded blind holes 24 along its circumference. The number of first threaded blind holes 24 and a number of strip-shaped through slots 22 are arranged alternately. The fixing plate 25 is fixed by a number of bolts arranged through it being threadedly connected to the number of first threaded blind holes 24 one by one.

[0038] The sliding component includes a sliding column 3 slidably disposed in the sliding groove 21. The power output end of the driving component is detachably connected to the upper end of the sliding column 3. Several connecting components are evenly distributed along the circumference of the sliding column 3 and are fixedly connected to the side wall of the sliding column 3 away from the driving component. Preferably, the length of the sliding column 3 is slightly longer than the length of the strip groove 22 to ensure that its side wall always closes the strip groove 22 during the sliding process of the sliding column 3, preventing feed from entering the sliding groove 21 from the strip groove 22.

[0039] Each of the aforementioned connectors includes a connecting rod 31 that freely passes through the corresponding strip groove 22. One end of the connecting rod 31 is fixedly connected to the side wall of the sliding column 3, and the other end is fixedly connected to the corresponding placement object.

[0040] Each of the aforementioned storage components includes a horizontally arranged storage plate 32, which is vertically slidably disposed within the corresponding feeding position 12 and fixedly connected to one end of the corresponding connecting rod 31.

[0041] The driving component includes an electric telescopic rod 4 vertically installed at the bottom of the slide groove 21. The telescopic end of the electric telescopic rod 4 is detachably connected to the upper end of the sliding column 3 via a connecting plate 41. The electric telescopic rod 4 is driven by an external power source and controlled by an external controller. The method and principle of controlling the telescopic stroke of the electric telescopic rod 4 according to the scale 23 are existing technologies and will not be described in detail here. Preferably, the upper end of the sliding column 3 has two second threaded blind holes 33. The connecting plate 41 is connected to the two second threaded blind holes 33 by two bolts installed through it, so as to realize the connection between the telescopic end of the electric telescopic rod 4 and the upper end of the sliding column 3. Moreover, by disassembling the fixing plate 25, the sliding column 3, several connecting rods 31 and several storage plates 32 can be removed for maintenance of the electric telescopic rod 4.

[0042] The electric telescopic rod 4 is activated, which drives the sliding column 3 to slide in the slide groove 21. This causes several connecting rods 31 to drive several placement plates 32 to move synchronously, thereby changing the volume between several feeding positions 12 and the corresponding placement plates 32, and achieving precise control of the amount of feed fed.

[0043] like Figure 1-2 As shown, according to another embodiment of the present invention, in a preferred embodiment of the poultry feeding equipment, a plurality of baffles 5 are fixedly installed between the small diameter end and the large diameter end of the double-layer truncated cone 2 along its axial direction. The plurality of baffles 5 are arranged one-to-one with the plurality of partitions 11. An inclined block 51 is fixedly installed between two adjacent baffles 5. The inclined surface of the inclined block 51 is inclined downward toward the corresponding feeding position 12.

[0044] like Figure 1 as well as Figure 6-9As shown, according to another embodiment of the present invention, in a preferred embodiment of the poultry feeding equipment, a feeding cylinder 6 is vertically fixedly installed at the top of the small-diameter end of the double-layer frustum 2. A feed hopper 61 is provided at the top of the feeding cylinder 6. A sealing plate 62 is rotatably installed on the feed end of the feed hopper 61. A plurality of discharge ports 63 are opened at the bottom of the feeding cylinder 6. These discharge ports 63 are evenly distributed along the circumference of the small-diameter end of the double-layer frustum 2 and are arranged one-to-one with several inclined blocks 51. A sealing plate 62 is rotatably installed on the bottom of the feeding cylinder 6. The feeding device is equipped with a feeding component, which is rotatably sleeved on the small-diameter end of the double-layered truncated cone 2. The feeding component has several feeding channels that are connected to several feeding ports 63 in a one-to-one correspondence. By rotating the feeding component so that the several feeding channels are connected to several feeding ports 63 in a one-to-one correspondence, the feed in the feeding cylinder 6 is fed into the placement plate 32 in several feeding positions 12 by several inclined blocks 51. By rotating the feeding component so that the several feeding channels are staggered from the several feeding ports 63, the feeding component closes the several feeding ports 63.

[0045] Each of the baffles 5 has a fixing block 52 fixedly installed on the upper part of the side wall away from the double-layer truncated cone 2. The feeding component includes a rotating ring 7 that is rotatably sleeved on the small diameter end of the double-layer truncated cone 2 and rotatably connected to the bottom of the feeding cylinder 6. Each feeding channel is a through hole 71 opened on the rotating ring 7. An operating rod 72 is fixedly installed on the side wall of the rotating ring 7. A positioning component is provided at the lower part of the operating rod 72. The positioning component is used to engage with any fixing block 52 to fix the position of the rotating ring 7 when the through holes 71 are misaligned with the corresponding feeding port 63.

[0046] Each of the fixed blocks 52 has a positioning hole 53 on its upper part. The lower part of the operating rod 72 near the rotating ring 7 has an installation groove 73. A pressing block 74 is slidably provided between the inner and outer sides of the installation groove 73. The pressing block 74 and the bottom of the installation groove 73 are elastically connected by several springs 76. The thickness of the pressing block 74 near the rotating ring 7 is less than the thickness of the other side. A positioning rod 75 is fixedly installed at the bottom of the side with less thickness of the pressing block 74. The positioning rod 75 is used to engage with the positioning hole 53 on any of the fixed blocks 52.

[0047] When feeding is required, the pressing block 74 is pressed into the mounting groove 73 and the spring 76 is compressed. At the same time, the positioning rod 75 is disengaged from the positioning hole 53. Then, the operating rod 72 drives the rotating ring 7 to rotate, so that the several through holes 71 are connected to the several feeding ports 63 one by one. If feeding is not required, the pressing block 74 is pressed into the mounting groove 73 and the spring 76 is compressed. At the same time, the operating rod 72 drives the rotating ring 7 to rotate, so that the positioning rod 75 moves to face one of the positioning holes 53. Then, the pressing block 74 is released. Under the elastic action of the spring 76, the positioning rod 75 is locked into the positioning hole 53, thereby fixing the position of the rotating ring 7.

[0048] The working principle of this utility model is as follows: First, feed is loaded into the feeding cylinder 6. Then, based on the amount of feed, the electric telescopic rod 4 is activated, causing the sliding column 3 to slide within the chute 21. This, in turn, drives several connecting rods 31 to move several placement plates 32 synchronously, thereby changing the volume between several feeding positions 12 and their corresponding placement plates 32. After adjustment, the electric telescopic rod 4 is closed. Then, the pressing block 74 is pressed, moving into the mounting groove 73 and compressing the spring 76. Simultaneously, the positioning rod 75 disengages from the positioning hole 53. Then, the operating rod 72 drives the rotating ring 7 to rotate, causing several through holes 71 to connect with several... The feed inlets 63 are connected one-to-one, so that the feed in the loading cylinder 6 is guided by several inclined blocks 51 and fed into the placement plates 32 in several feeding positions 12. When each feeding position 12 is full of feed, the pressing block 74 is pressed and moved into the mounting groove 73 and the spring 76 is compressed. At the same time, the operating rod 72 drives the rotating ring 7 to rotate, so that the positioning rod 75 moves to face one of the positioning holes 53. Then the pressing block 74 is released, and under the elastic action of the spring 76, the positioning rod 75 is locked into the positioning hole 53, thereby completing the fixation of the position of the rotating ring 7. At this time, the feed is no longer fed from the loading cylinder 6 into the feeding positions 12.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A poultry feeding device, characterized in that, include: A ring-shaped plate (1) is arranged horizontally; The support base is set inside the annular plate (1). The annular plate (1) and the support base are fixedly connected by several partitions (11). The partitions (11) are arranged radially along the annular plate (1) and divide the annular plate (1) and the support base into several feeding positions (12) with the same volume. The adjustment mechanism includes a drive unit disposed in the support base, a sliding unit disposed vertically in the support base, a placement unit disposed vertically in a plurality of feeding positions (12) corresponding to each other, and a plurality of connecting units connected between the plurality of placement units and the sliding unit. The power output end of the drive unit is connected to the sliding unit, and each of the connecting units freely passes through the support base and slides in the vertical direction. The driving component drives the sliding component to move in the vertical direction, and drives several objects to move synchronously through several connecting components, so as to change the volume between several feeding positions (12) and several objects.

2. The poultry feeding equipment according to claim 1, characterized in that, The support base includes a double-layered frustum (2) coaxially arranged in an annular plate (1). The small-diameter end of the double-layered frustum (2) is arranged upward. A sliding groove (21) is provided along the axial direction at the bottom of the large-diameter end of the double-layered frustum (2). Several strip-shaped through grooves (22) are provided on the side wall of the large-diameter end of the double-layered frustum (2) facing its bottom. Several strip-shaped through grooves (22) are evenly distributed along the circumference of the large-diameter end of the double-layered frustum (2). A fixing plate (25) is detachably connected to the bottom of the large-diameter end of the double-layered frustum (2) to close the sliding groove (21) and several strip-shaped through grooves (22). The sliding member is arranged in the sliding groove (21). Several connecting members are connected one-to-one and freely pass through several strip-shaped through grooves (22).

3. The poultry feeding equipment according to claim 2, characterized in that, The sliding member includes a sliding column (3) slidably disposed in the sliding groove (21). The power output end of the driving member is detachably connected to the upper end of the sliding column (3). Several connecting members are evenly distributed along the circumference of the sliding column (3) and are fixedly connected to the side wall of the sliding column (3) away from the driving member.

4. The poultry feeding equipment according to claim 3, characterized in that, Each of the connectors includes a connecting rod (31) that freely passes through the corresponding strip groove (22). One end of the connecting rod (31) is fixedly connected to the side wall of the sliding column (3), and the other end is fixedly connected to the corresponding object.

5. A poultry feeding device according to claim 4, characterized in that, Each of the aforementioned storage components includes a horizontally arranged storage plate (32), which is vertically slidably disposed within the corresponding feeding position (12) and fixedly connected to one end of the corresponding connecting rod (31).

6. A poultry feeding device according to claim 3, characterized in that, The driving component includes an electric telescopic rod (4) that is vertically installed at the bottom of the slide (21). The telescopic end of the electric telescopic rod (4) is detachably connected to the upper end of the sliding column (3) through a connecting plate (41).

7. A poultry feeding device according to claim 2, characterized in that, A number of baffles (5) are fixedly installed between the small diameter end and the large diameter end of the double-layer truncated cone (2) along its axial direction. The baffles (5) are arranged one-to-one with the partitions (11). An inclined block (51) is fixedly installed between two adjacent baffles (5). The inclined surface of the inclined block (51) is inclined downward toward the corresponding feeding position (12).

8. A poultry feeding device according to claim 7, characterized in that, A loading cylinder (6) is vertically fixed at the top of the small diameter end of the double-layer truncated cone (2). A feeding hopper (61) is provided at the top of the loading cylinder (6). A sealing plate (62) is rotatably installed on the feeding end of the feeding hopper (61). Several discharge ports (63) are opened at the bottom of the loading cylinder (6). Several discharge ports (63) are evenly distributed along the circumference of the small diameter end of the double-layer truncated cone (2) and are arranged one-to-one with several inclined blocks (51). A feeding component is rotatably installed on the bottom of the loading cylinder (6). The feeding component is rotatably sleeved on the small diameter end of the double-layer truncated cone (2). Several feeding channels are opened on the feeding component for communicating one-to-one with several discharge ports (63).

9. A poultry feeding device according to claim 8, characterized in that, Each of the baffles (5) has a fixed block (52) fixedly installed on the upper part of the side wall away from the double-layer truncated cone (2). The feeding component includes a rotating ring (7) that is rotatably sleeved on the small diameter end of the double-layer truncated cone (2) and rotatably connected to the bottom of the loading cylinder (6). Each feeding channel is a through hole (71) opened on the rotating ring (7). An operating rod (72) is fixedly installed on the side wall of the rotating ring (7). A positioning component is provided at the lower part of the operating rod (72). The positioning component is used to engage with any fixed block (52) to fix the position of the rotating ring (7) when the through holes (71) are misaligned with the corresponding feeding port (63).

10. A poultry feeding device according to claim 9, characterized in that, Each of the fixed blocks (52) has a positioning hole (53) on its upper part. The operating rod (72) has a mounting groove (73) at the lower part of one end near the rotating ring (7). A pressing block (74) is slidably provided between the inner and outer sides of the mounting groove (73). The pressing block (74) and the bottom of the mounting groove (73) are elastically connected by several springs (76). The thickness of the pressing block (74) on the side near the rotating ring (7) is less than the thickness of the other side. A positioning rod (75) is fixedly installed at the bottom of the side with the smaller thickness of the pressing block (74). The positioning rod (75) is used to engage with the positioning hole (53) on any of the fixed blocks (52).

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