Cold cradle for cattle

Abstract

The present application relates to the field of livestock breeding equipment, in particular to a cold type cattle fixing frame. The frame comprises an outer frame structure, a neck clamping device, a width limiting mechanism and a rear blocking mechanism. The outer frame structure has a front-to-back through cattle body space. The neck clamping device is arranged at the front of the outer frame structure and comprises two groups of neck clamping components symmetrically distributed along the transverse direction and a control mechanism for moving the two groups of neck clamping components towards or away from each other. The control mechanism comprises an operating rod, a connecting rod a, a connecting rod b, a one-way resistance plate, a pin, a mounting structure and a one-way roller for locking the one-way resistance plate to prevent the cattle from pushing the two groups of neck clamping components apart. The operating rod is rotationally arranged at the front of the outer frame structure and is rotationally connected with one end of the connecting rod a and one end of the connecting rod b. The width limiting mechanism is arranged at the left of the outer frame structure. The rear blocking mechanism is transversely arranged on the outer frame structure. The present application can stably fix the cattle to facilitate operation and avoid injury to personnel.

Description

Technical Field

[0001] This invention relates to the field of livestock breeding equipment, and in particular to a cold-type cattle restraint frame. Background Technology

[0002] In cattle farming, routine restraint procedures such as oocyte retrieval, artificial insemination, injections, surgical restraint, physical examinations, and hoof trimming are common. Cattle are prone to swaying due to pain or other stimuli, posing a safety hazard. While conventional restraint frames can be used, they are often simple in structure, lack stability, and their fixed size prevents adjustment to different cattle sizes, hindering widespread adoption.

[0003] Chinese Patent Publication No. CN208876884U discloses a live oviposition restraint frame for dairy cows, which solves the problem that the restraint frame in the prior art cannot be adjusted according to the body size of the dairy cow. It has the effects of being able to firmly fix the dairy cow, having high self-stability, and being widely applicable to dairy cows of different body sizes.

[0004] However, the above technical solution has the following shortcomings:

[0005] There is a 20cm gap between the first and second doors, allowing the cow's head to protrude. However, the cow's head still has a large range of movement in the gap, and the restraint rope is flexible, making it easy for the cow to struggle and loosen the rope, which could easily cause injury to the operator. Summary of the Invention

[0006] The purpose of this invention is to address the problems existing in the background art by proposing a cold-type cattle restraint frame that can stably fix cattle, thus facilitating operation and avoiding injury to personnel. This restraint frame can be adjusted in length and width to accommodate cattle of different sizes, and the neck clamp that holds the cattle's neck can also be adjusted.

[0007] The technical solution of this invention is a cold-type cattle restraint frame, comprising an outer frame structure, a neck clamp device, a width limiting mechanism, and a rear stop mechanism; the outer frame structure has a through-type cattle body space, the neck clamp device is located at the front of the outer frame structure, including two sets of neck clamp assemblies symmetrically distributed laterally and an operating mechanism for driving the two sets of neck clamp assemblies to move towards or away from each other, the neck clamp assemblies move laterally, the operating mechanism includes a crank handle, a rotating rod, connecting rod a, connecting rod b, a one-way resistance plate, a pin, a mounting structure, and a one-way roller for locking the one-way resistance plate to prevent the cattle from squeezing the two sets of neck clamp assemblies to the sides, the crank handle and... The rotating rod is rotatably connected to one end of connecting rod a and one end of connecting rod b, respectively. The rotating rod is rotatably positioned at the front of the outer frame structure. The other end of connecting rod a is rotatably connected to the right neck clamp assembly, and the other end of connecting rod b is rotatably connected to the left neck clamp assembly. The one-way resistance plate is an arc-shaped plate with its central axis coaxial with the rotational central axis of the operating rod. The pin is positioned at the front of the outer frame structure and contacts the inner surface of the one-way resistance plate. The mounting structure is positioned at the front of the outer frame structure, and the one-way roller is rotatably connected to the mounting structure. The width limiting mechanism is positioned on the left side of the outer frame structure. The rear stop mechanism is transversely positioned on the outer frame structure.

[0008] Preferably, the mounting structure includes a stop block, bolt b, and a lifting eye bolt. The stop block is located at the front of the outer frame structure, bolt b is connected to the stop block, the lifting eye bolt is threadedly connected to the one-way roller, and the one-way roller is rotatably connected to bolt b.

[0009] Preferably, the outer frame structure includes a left frame, a right frame, a front frame, and a rear crossbeam. The left and right frames are arranged side by side from left to right, the front frame is connected to the front end of the left and right frames, and the rear crossbeam is connected to the rear end of the left and right frames.

[0010] Preferably, a rolling channel is provided at the top of the front frame; the neck clamp assembly includes a neck clamp, a translation rod, a fixed frame, a rotating frame, a mounting plate, and rollers. The neck clamp has a bent rod portion and forms a clamping groove. The mounting plate is connected to the neck clamp and the translation rod respectively. The rollers are mounted on the mounting plate and are rolled within the rolling channel. The fixed frame is connected to the neck clamp and the translation rod respectively. The rotating frame is sleeved on the fixed frame.

[0011] Preferably, the width limiting mechanism includes a connecting frame a, a width limiting frame, a connecting frame b, a sleeve rod, an offset sliding sleeve, a magnet, a guide frame, and a caster wheel. The left frame, connecting frame a, the width limiting frame, the connecting frame b, and the left frame are rotatably connected in sequence to form a parallelogram mechanism. The offset sliding sleeve is made of ferromagnetic material and is sleeved on the sleeve rod. The magnet is located on the upper part of the sleeve rod, and the sleeve rod is located on the connecting frame a. A limit frame is provided at the front end of the offset sliding sleeve. The guide frame is located on the left frame and has a guide surface that guides the limit frame. The guide surface is a spiral curved surface. The caster wheel is located at the bottom of the width limiting frame.

[0012] Preferably, the rear stop mechanism includes a stop bar and two sets of rear stop assemblies symmetrically distributed on the left and right. Each rear stop assembly includes an upper crossbar, a lower crossbar, and a limiting assembly. Multiple sets of limiting assemblies are arranged side by side from front to back. Each limiting assembly includes a bolt a and a fisheye bolt. Two upper crossbars in the two sets of rear stop assemblies are respectively set on the left and right frames, and two lower crossbars in the two sets of rear stop assemblies are respectively set on the left and right frames. The lower crossbars are located below the upper crossbars. A strip channel for the fisheye bolt to move is provided at the bottom of the upper crossbar. The fisheye bolt is inclined forward from top to bottom and abuts against the top of the lower crossbar. The fisheye bolt is rotatably sleeved on bolt a. Bolt a is connected to the upper crossbar. The stop bar is placed on the lower crossbar and located between two adjacent sets of limiting assemblies.

[0013] Preferably, hooks are provided at the front of both the left and right frames, and limit rods are attached to the two hooks.

[0014] Compared with the prior art, the present invention has the following beneficial technical effects:

[0015] This invention can stably restrain cattle, allowing them to safely undergo various livestock management operations, such as quarantine and egg retrieval, helping to avoid accidental injuries between the cattle and operators. In use, the operator drives the cattle into the space within the outer frame structure. Pressing down the operating lever moves connecting rods a and b. Connecting rod a moves the right-side neck clamp assembly to the left, and connecting rod b moves the left-side neck clamp assembly to the right, until the cattle's head is clamped between the two sets of neck clamps. After the cattle's neck is clamped, a width-limiting mechanism restricts the cattle's width, achieving lateral clamping. Finally, a rear-blocking mechanism restricts the cattle's movement from behind, preventing them from struggling backward. By restricting the cattle from the front, left, right, and rear, the cattle are stably restrained, limiting their strength and preventing them from escaping, thus preventing personal injury to personnel and ensuring higher safety. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the two neck clips in the unfolded state in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of the two neck clamps in the closed state in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram of the framework structure of an embodiment of the present invention;

[0019] Figure 4 This is a schematic diagram of the opening and closing principle of the two neck clips in an embodiment of the present invention;

[0020] Figure 5 for Figure 4 Enlarged view of the structure at point A in the middle;

[0021] Figure 6 This is a schematic diagram of the position adjustment principle of the width limiting frame in an embodiment of the present invention;

[0022] Figure 7 for Figure 6 Enlarged view of the structure at point B;

[0023] Figure 8 This is a schematic diagram of the principle structure for adjusting the position of the stop lever in an embodiment of the present invention;

[0024] Figure 9 for Figure 8 Enlarged view of the structure at point C.

[0025] Reference numerals: 1. Left frame; 2. Right frame; 3. Front frame; 301. Rolling channel; 4. Rear crossbeam; 5. Upper crossbar; 501. Strip channel; 6. Lower crossbar; 7. Bolt a; 8. Fisheye bolt; 9. Stop bar; 10. Neck clamp; 11. Translation rod; 12. Fixed frame; 13. Rotating frame; 14. Mounting plate; 15. Handle; 16. Rotating rod; 17. Connecting rod a; 18. Connecting rod b; 19. One-way resistance plate; 20. Pin; 21. Stop block; 22. Bolt b; 23. One-way roller; 24. Lifting eye bolt; 25. Connecting frame a; 26. Width limiting frame; 27. Connecting frame b; 28. Sleeve rod; 29. ​​Offset sliding sleeve; 30. Limiting frame; 31. Magnet; 32. Guide frame; 321. Guide surface; 33. Caster wheel; 34. Limiting rod; 35. Hook. Detailed Implementation

[0026] Example 1

[0027] like Figures 1-9 As shown in the figure, the cold-type cattle restraint frame proposed in this embodiment includes an outer frame structure, a neck clamp device, a width limiting mechanism, and a rear stop mechanism. The neck clamp device is used to clamp the neck of the cattle, the width limiting mechanism adjusts the width of the standing area of ​​the cattle, and the rear stop mechanism limits the cattle from the rear to prevent the cattle from moving backward. By using the above structure in combination, the cattle can be firmly fixed.

[0028] like Figure 3 As shown, the outer frame structure has a through-type space for the cow's body. The outer frame structure includes a left frame 1, a right frame 2, a front frame 3, and a rear crossbeam 4. The left frame 1 and the right frame 2 are arranged side by side from left to right. The front frame 3 is connected to the front end of the left frame 1 and the right frame 2, and the rear crossbeam 4 is connected to the rear end of the left frame 1 and the right frame 2.

[0029] like Figure 4 and Figure 5As shown, the neck clamp device is located at the front of the outer frame structure. The neck clamp device includes two sets of neck clamp assemblies symmetrically distributed laterally and an operating mechanism for driving the two sets of neck clamp assemblies to move towards or away from each other. The neck clamp assemblies move laterally. The operating mechanism includes an operating lever, a connecting rod a17, a connecting rod b18, a one-way resistance plate 19, a pin 20, a mounting structure, and a one-way roller 23 for locking the one-way resistance plate 19 to prevent the cow from squeezing the two sets of neck clamp assemblies to both sides. The operating lever is rotatably located at the front of the outer frame structure. The operating lever is rotatably connected to one end of the connecting rod a17 and one end of the connecting rod b18, respectively. The other end of the connecting rod a17 is rotatably connected to the right neck clamp assembly, and the other end of the connecting rod b18 is rotatably connected to the left neck clamp assembly. The one-way resistance plate 19 is an arc-shaped plate with its central axis coaxial with the rotational central axis of the operating lever. The pin 20 is located at the front of the outer frame structure and contacts the inner surface of the one-way resistance plate 19. The mounting structure is located at the front of the outer frame structure, and the one-way roller 23 is rotatably connected to the mounting structure. The operator can press down the operating lever to move the two sets of neck clamp assemblies toward each other to clamp the head and neck of the cattle. When moving the two sets of neck clamp assemblies apart, the operator needs to first rotate the one-way roller 23 upward to release the obstruction of the one-way resistance plate 19, so that the operating lever can be pushed up smoothly and the two sets of neck clamp assemblies can be moved outward.

[0030] like Figure 6 and Figure 7 As shown, the width limiting mechanism is located on the left side of the outer frame structure. The width limiting mechanism includes a connecting frame a25, a width limiting frame 26, a connecting frame b27, a sleeve rod 28, an offset sliding sleeve 29, a limiting frame 30, a magnet 31, a guide frame 32, and a caster wheel 33. The left frame 1, connecting frame a25, width limiting frame 26, connecting frame b27, and left frame 1 are rotatably connected to form a parallelogram mechanism. The offset sliding sleeve 29 is made of ferromagnetic material and is sleeved on the sleeve rod 28. The magnet 31 is located on the upper part of the sleeve rod 28. The sleeve rod 28 is located on the connecting frame a25. The offset sliding sleeve 29 is located on the limiting frame 30. The guide frame 32 is located on the left frame 1. The guide frame 32 has a guide surface 321 that guides the limiting frame 30. The guide surface 321 is a spiral curved surface. The caster wheel 33 is located at the bottom of the width limiting frame 26.

[0031] When limiting the width of the cattle, the offset sliding sleeve 29 is removed from the magnet 31, the limiting frame 30 is placed on the guide surface 321 of the guide frame 32, and then the connecting frame a25 is pushed inward. The connecting frame a25, the width limiting frame 26, and the connecting frame b27 move simultaneously. The limiting frame 30 gradually slides down on the guide surface 321, and the width limiting frame 26 maintains a parallel state with the left frame 1. The caster wheel 33 plays a sliding role, allowing the width limiting adjustment process to slide smoothly, thus limiting the cattle within the required width range. The caster wheel 33 can move as far as the bottom of the rear crossbeam 4 and will not continue to rotate inward. The cattle body is positioned between the width limiting frame 26 and the right frame 2. When the cattle struggle, the guide frame 32 prevents the limiting frame 30 from moving in the opposite direction through the guide surface 321, thus ensuring the width limiting effect.

[0032] like Figure 8 and Figure 9 As shown, the rear stop mechanism is horizontally mounted on the outer frame structure. The rear stop mechanism includes a stop bar 9 and two sets of rear stop assemblies symmetrically distributed on the left and right. The rear stop assembly includes an upper crossbar 5, a lower crossbar 6, and a limiting assembly. Multiple sets of limiting assemblies are arranged side by side from front to back. The limiting assembly includes bolt a7 and fisheye bolt 8. The two upper crossbars 5 in the two sets of rear stop assemblies are respectively mounted on the left frame 1 and the right frame 2. The two lower crossbars 6 in the two sets of rear stop assemblies are respectively mounted on the left frame 1 and the right frame 2. The lower crossbar 6 is located below the upper crossbar 5. The bottom of the upper crossbar 5 is provided with a strip channel 501 for the fisheye bolt 8 to move. The fisheye bolt 8 is inclined forward from top to bottom and abuts against the top of the lower crossbar 6. The fisheye bolt 8 is rotatably sleeved on bolt a7. Bolt a7 is connected to the upper crossbar 5. The stop bar 9 is placed on the lower crossbar 6 and is located between the two adjacent sets of limiting assemblies.

[0033] When limiting the cattle from behind, the stop lever 9 is inserted between the two sets of limiting components and moved forward to the cattle's rump area. The spherical bolt 8 can only tilt forward. When the stop lever 9 rests on the lower crossbar 6, if the cattle push the stop lever 9 backward, the spherical bolt 8 will prevent the stop lever 9 from moving backward, thus preventing the cattle from moving backward. When it is necessary to adjust the cattle's position forward, the stop lever 9 can be moved forward to the desired position.

[0034] like Figures 1-3 As shown, in order to further improve the restraining effect on the cattle, hooks 35 are provided at the front of both the left frame 1 and the right frame 2. A restraining rod 34 is attached to the two hooks 35. The restraining rod 34 restrains the cattle at the front of the body to prevent the cattle from rushing out of the restraint frame before their necks are clamped.

[0035] This embodiment can stably restrain cattle, allowing them to safely undergo various breeding and management operations, such as quarantine and egg retrieval, helping to avoid accidental injuries between cattle and operators. In use, operators drive the cattle into the space within the outer frame structure. Pressing down the operating lever moves connecting rods a17 and b18. Connecting rod a17 moves the right neck clamp assembly to the left, and connecting rod b18 moves the left neck clamp assembly to the right, until the cow's head is clamped between the two sets of neck clamp assemblies. When the cow tries to break free of the neck clamp, the frictional resistance of the one-way roller 23 against the one-way resistance plate 19 creates a dead point, preventing the one-way resistance plate 19 from rotating downwards and the connecting end of the rotating rod 16 from rotating upwards. The two sets of neck clamp assemblies cannot open. Only when the operator first rotates the one-way roller 23 upwards and then pushes the operating lever upwards can the rotating rod 16 move the connecting rods a17 and b18, ultimately allowing the two sets of neck clamp assemblies to move away from each other, thus releasing the clamping restriction on the cow's head and neck. After the cow's neck is clamped, a width-limiting mechanism restricts the cow's width, achieving left and right clamping. Finally, a rear stop mechanism restricts the cow's movement from behind, preventing it from struggling backwards. By restricting the cattle from the front, left, right, and rear, the cattle can be stably fixed, limiting their strength and preventing them from breaking free, thus preventing personal injury to personnel and enhancing safety.

[0036] Example 2

[0037] like Figure 1 and Figure 2 As shown in the figure, the cold-type cattle restraint frame proposed in this embodiment, compared with the first embodiment, has an operating lever including a crank 15 and a rotating rod 16. The crank 15 is connected to the rotating rod 16, and the rotating rod 16 is rotatably connected to the connecting rod a17 and the connecting rod b18 respectively.

[0038] In this embodiment, the crank handle 15 allows the operator to easily switch the two sets of neck clamp assemblies on and off. The crank handle 15 drives the rotating rod 16 to rotate, thereby driving the connecting rod a17 and the connecting rod b18 to move, and ultimately driving the two sets of neck clamp assemblies to move towards or away from each other.

[0039] Example 3

[0040] like Figure 4 and Figure 5 As shown in the figure, the cold-type cattle restraint frame proposed in this embodiment, compared with the first embodiment, the installation structure in this embodiment includes a stop block 21, a bolt b22 and a lifting eye bolt 24. The stop block 21 is set at the front of the outer frame structure, the bolt b22 is connected to the stop block 21, the lifting eye bolt 24 is threadedly connected to the one-way roller 23, and the one-way roller 23 is rotatably connected to the bolt b22.

[0041] In this embodiment, the one-way roller 23 can rotate upward around the bolt b22, thereby facilitating the removal of the obstruction of the one-way resistance plate 19 by the one-way roller 23 and allowing personnel to easily open the two sets of neck clamp assemblies. Without rotating the one-way roller 23 upward, the cattle cannot break free by their own strength.

[0042] Example 4

[0043] like Figures 1-4 As shown, this embodiment proposes a cold-type bovine restraint frame. Compared with Embodiment 1, in this embodiment, the top of the front frame 3 is provided with a rolling channel 301; the neck clamp assembly includes a neck clamp 10, a translation rod 11, a fixing frame 12, a rotating frame 13, a mounting plate 14, and rollers. The neck clamp 10 has a bent rod portion and forms a clamping groove. The mounting plate 14 is connected to the neck clamp 10 and the translation rod 11 respectively. The rollers are disposed on the mounting plate 14 and are rotatably disposed in the rolling channel 301. The fixing frame 12 is connected to the neck clamp 10 and the translation rod 11 respectively. The rotating frame 13 is sleeved on the fixing frame 12.

[0044] In this embodiment, the cow's neck can be clamped between the slots of the two neck clamps 10, resulting in a better clamping and fixing effect. When the neck clamp assembly moves, it rolls within the rolling channel 301 via rollers, making the movement of the neck clamp assembly very smooth. The rotating frame 13 can rotate inward around the fixed frame 12; by fixing the inner column of the rotating frame 13 with ropes, the cow's head can be secured, providing enhanced protection.

[0045] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. A cold-type bovine restraint frame, characterized in that, include: The outer frame structure has a through-hole space for the cow's body. The outer frame structure includes a left frame (1), a right frame (2), a front frame (3) and a rear crossbeam (4). The left frame (1) and the right frame (2) are arranged side by side from left to right. The front frame (3) is connected to the front end of the left frame (1) and the right frame (2). The rear crossbeam (4) is connected to the rear end of the left frame (1) and the right frame (2). The neck clamp device, located at the front of the outer frame structure, includes two sets of neck clamp assemblies symmetrically distributed laterally and an operating mechanism for moving the two sets of neck clamp assemblies toward each other or apart. The neck clamp assemblies move laterally. The operating mechanism includes a crank (15), a rotating rod (16), a connecting rod a (17), a connecting rod b (18), a one-way resistance plate (19), a pin (20), a mounting structure, and a one-way roller (23) for locking the one-way resistance plate (19) to prevent the cow from squeezing the two sets of neck clamp assemblies apart. The crank (15) is connected to the rotating rod (16), and the rotating rod (16) One end of connecting rod a (17) and one end of connecting rod b (18) are rotatably connected. Rotating rod (16) is rotatably set at the front of the outer frame structure. The other end of connecting rod a (17) is rotatably connected to the right neck clamp assembly. The other end of connecting rod b (18) is rotatably connected to the left neck clamp assembly. The one-way resistance plate (19) is an arc-shaped plate and its central axis is coaxial with the rotation center axis of the operating rod. Pin (20) is set at the front of the outer frame structure and contacts the inner side of the one-way resistance plate (19). The mounting structure is set at the front of the outer frame structure. One-way roller (23) is rotatably connected to the mounting structure. The width limiting mechanism is located on the left side of the outer frame structure. The width limiting mechanism includes connecting frame a (25), width limiting frame (26), connecting frame b (27), sleeve rod (28), offset sliding sleeve (29), magnet (31), guide frame (32) and caster wheel (33). The left frame (1), connecting frame a (25), width limiting frame (26), connecting frame b (27) and left frame (1) are rotatably connected in sequence to form a parallelogram mechanism. The offset sliding sleeve (29) is made of ferromagnetic material. The offset sleeve (29) is fitted onto the sleeve rod (28), the magnet (31) is set on the upper part of the sleeve rod (28), the sleeve rod (28) is set on the connecting frame a (25), the front end of the offset sleeve (29) is provided with a limit frame (30), the guide frame (32) is set on the left frame (1), the guide frame (32) has a guide surface (321) for guiding the limit frame (30), the guide surface (321) is a spiral curved surface, and the universal wheel (33) is set at the bottom of the width limiting frame (26); The rear deflector mechanism is horizontally mounted on the outer frame structure.

2. The cold-type bovine restraint frame according to claim 1, characterized in that, The mounting structure includes a stop block (21), bolt b (22) and eye bolt (24). The stop block (21) is located at the front of the outer frame structure. Bolt b (22) is connected to the stop block (21). Eye bolt (24) is threadedly connected to one-way roller (23). One-way roller (23) is rotatably connected to bolt b (22).

3. The cold-type bovine restraint frame according to claim 1, characterized in that, The front frame (3) has a rolling channel (301) at the top; the neck clamp assembly includes a neck clamp (10), a translation rod (11), a fixed frame (12), a rotating frame (13), a mounting plate (14) and rollers. The neck clamp (10) has a bent rod portion and forms a clamping groove. The mounting plate (14) is connected to the neck clamp (10) and the translation rod (11) respectively. The rollers are set on the mounting plate (14) and are rolled in the rolling channel (301). The fixed frame (12) is connected to the neck clamp (10) and the translation rod (11) respectively. The rotating frame (13) is sleeved on the fixed frame (12).

4. The cold-type bovine restraint frame according to claim 1, characterized in that, The rear stop mechanism includes a stop bar (9) and two sets of rear stop components symmetrically distributed on the left and right. The rear stop components include an upper crossbar (5), a lower crossbar (6) and a limiting component. Multiple sets of limiting components are arranged side by side from front to back. The limiting component includes bolt a (7) and a fisheye bolt (8). The two upper crossbars (5) in the two sets of rear stop components are respectively set on the left frame (1) and the right frame (2). The two lower crossbars (6) in the two sets of rear stop components are respectively set on the left frame (1) and the right frame (2). The lower crossbar (6) is located below the upper crossbar (5). The bottom of the upper crossbar (5) is provided with a strip channel (501) for the fisheye bolt (8) to move. The fisheye bolt (8) is inclined forward from top to bottom and abuts against the top of the lower crossbar (6). The fisheye bolt (8) is rotated and sleeved on bolt a (7). Bolt a (7) is connected to the upper crossbar (5). The stop bar (9) is placed on the lower crossbar (6) and located between the two adjacent sets of limiting components.

5. A cold-type bovine restraint frame according to claim 4, characterized in that, Hooks (35) are provided at the front of both the left frame (1) and the right frame (2), and a limit rod (34) is placed on the two hooks (35).

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