Piglet anti-pressing device based on gravity transmission

Abstract

The invention relates to the technical field of piglet pressure prevention, in particular to a piglet pressure prevention device based on gravity transmission, which comprises an obstetric table body, a rotating assembly is arranged at the top of the obstetric table body, the rotating assembly comprises first rotating rods, and the first rotating rods are arranged on two sides of the top of the obstetric table body. According to the piglet pushing device, through cooperation of the driving assembly and the rotating assembly, a flexible traction tension line is adopted to replace a complex gear or ratchet mechanism, linear motion of the clamping assembly is directly converted into rotating motion of the pushing plate, and the pushing plate is driven to rotate; due to the design, the number of parts of the whole transmission chain, the requirement for machining precision and the assembling complexity are greatly reduced, the manufacturing cost is remarkably reduced, meanwhile, the problems that a precise metal transmission part is prone to corrosion and clamping stagnation in a severe environment are solved, the structure is more solid and durable, the maintenance requirement is extremely low, and the service life is long. The device is especially suitable for long-term reliable work in a humid and dusty pig farm environment.

Description

Technical Field

[0001] This invention relates to the field of piglet crush prevention technology, and in particular to a piglet crush prevention device based on gravity transmission. Background Technology

[0002] In the modern, large-scale pig farming industry, the management level of sow farrowing pens directly affects the survival rate of piglets and the economic benefits of farms. Among them, newborn piglets, due to their slow movement and small size, are often accidentally crushed to death by the sow's large body when she gets up or lies down, which is the leading cause of death for suckling piglets and brings significant economic losses to the farming industry. To solve this persistent problem in the industry, practitioners and researchers have proposed a variety of technical solutions, but all of them have limitations to varying degrees.

[0003] Early solutions primarily focused on environmental management and behavioral interventions, such as improving farrowing crate floor design or relying on frequent manual patrols to promptly remove piglets from under the sow. These methods either had limited effectiveness or relied on intensive manual labor, making it difficult to achieve stable and efficient protection and failing to meet the needs of large-scale farming. Therefore, technological development shifted its focus to physical isolation and mechanical protective devices. Currently, mainstream technologies on the market can be broadly divided into two categories. The first category is the integrated lifting farrowing crate. This type of solution typically uses electric, hydraulic, or mechanical methods to raise the entire or partial surface of the farrowing crate when the sow lies down, or to create a physical safety space for the piglets by raising the surrounding railings. The advantage of this type of device is its relatively thorough protection; however, its disadvantages are extremely prominent. First, the system structure is complex, including a power unit, control unit, and actuator, resulting in high manufacturing and installation / maintenance costs, making it difficult to popularize in small and medium-sized farms. Second, the overall lifting action may interfere with the sow's normal nursing behavior, causing stress to the sow. Finally, depending on… Relying on external energy sources presents energy consumption issues and the risk of power outages, and its reliability is constrained by external conditions. The second type is the local mechanical trigger anti-pressure device. This type of device is usually fixed in the limiting stall or a specific position of the farrowing crate. When the sow's lying down is detected, a mechanical mechanism is triggered to quickly push the piglets under the sow's abdomen away. Compared with the overall lifting farrowing crate, its structure is simpler and the cost is lower. However, most existing mechanical trigger devices generally use precision or complex rigid transmission and locking mechanisms such as gears, racks, ratchet, and connecting rods to achieve reliable triggering, execution, and locking functions. These designs bring new problems. First, precision metal parts such as gears and ratchet are prone to rust, wear, and jamming by dirt in the harsh environment of the farrowing house, which is characterized by high temperature, high humidity, and the presence of feces, urine, and corrosive ammonia. This can lead to device failure and frequent and difficult maintenance. Second, the rigid mechanism designed to achieve the locking function often has a relatively abrupt and rapid reset process, which may generate significant noise or mechanical impact, frightening the sow and sensitive piglets, thus violating animal welfare principles. Summary of the Invention

[0004] To overcome the shortcomings of the prior art, the present invention provides a piglet anti-crushing device based on gravity transmission.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a piglet anti-crushing device based on gravity transmission, comprising a farrowing crate body, a rotating assembly being provided on the top of the farrowing crate body, the rotating assembly including a first rotating rod, the first rotating rod being disposed on both sides of the top of the farrowing crate body, a piglet push plate being fixedly connected to the surface of the first rotating rod, a torsion spring being sleeved on the bottom of the surface of the first rotating rod, a clamping assembly being provided on the top of the farrowing crate body, a limit assembly being provided on the top of the farrowing crate body, and a sewage discharge assembly being provided inside the farrowing crate body.

[0006] As a preferred embodiment of the present invention, the clamping assembly includes a sliding rod, which is fixedly connected to both sides of the delivery bed body. A first sliding groove is provided on both sides of the sliding rod. A first spring is fixedly connected to the bottom of the inner cavity of the first sliding groove. A first slider is fixedly connected to the top of the first spring. A sliding sleeve is fixedly connected to the side of the two first sliders away from the first sliding groove. A clamping plate is fixedly connected to the side of the two sliding sleeves that are close to each other.

[0007] As a preferred embodiment of the present invention, a driving assembly is fixedly connected to the surface of the first rotating rod. The driving assembly includes a take-up reel and a fixed frame. The take-up reel is rotatably connected to the surface of the first rotating rod. The fixed frame is fixedly connected to one side of the sliding rod. Second rotating rods are rotatably connected to both sides of the inner cavity of the fixed frame. A guide wheel is fixedly connected between the two second rotating rods. A tension line is sleeved on the surface of the take-up reel. The end of the tension line away from the take-up reel is sleeved on the surface of the guide wheel. The end of the tension line away from the guide wheel is fixedly connected to the sliding sleeve.

[0008] As a preferred embodiment of the present invention, the limiting component includes a second slide groove, a second slider is slidably connected inside the second slide groove, and the top of the second slider is fixedly connected to the piglet pusher plate.

[0009] As a preferred embodiment of the present invention, a protective component is provided on the opposite side of the two piglet pushers. The protective component includes a device frame, which is fixedly connected to the side of the piglet pusher away from the sliding rod. An inlet is provided on the side of the device frame away from the piglet pusher. A spring is fixedly connected inside the device frame. A buffer plate is fixedly connected to the side of the spring away from the device frame. A third sliding groove is provided on both sides of the inner cavity of the device frame. A third slider is slidably connected inside the third sliding groove. The two third sliders are fixedly connected to the buffer plate on the side near the buffer plate.

[0010] As a preferred embodiment of the present invention, the sewage discharge assembly includes a sewage discharge trough and a sewage discharge outlet. The sewage discharge trough is located inside the farrowing crate body, and the sewage discharge outlet is located at the top of the farrowing crate body. The sewage discharge outlet is connected to the sewage discharge trough. A sewage discharge mesh plate is fixedly connected between the two sides of the inner cavity of the sewage discharge outlet. The sewage discharge mesh plate is used to allow feces to fall into the interior of the sewage discharge trough. The mesh openings on the surface of the sewage discharge mesh plate are small to prevent piglets from falling in. A sewage discharge pipe is fixedly connected inside the sewage discharge trough. One end of the sewage discharge pipe passes through the sewage discharge trough and extends to the outside of the sewage discharge trough. A solenoid valve is fixedly connected to the surface of the sewage discharge pipe extending to the outside of the sewage discharge trough.

[0011] Compared with the prior art, the beneficial effects that this invention can achieve are: This invention achieves a revolutionary simplification and reliability improvement of the transmission system through the cooperation of the drive component and the rotating component. The solution uses a flexible traction line to replace the complex gear or ratchet mechanism, directly converting the linear motion of the clamping component into the rotational motion of the push plate. This design significantly reduces the number of parts, machining accuracy requirements and assembly complexity of the entire transmission chain, thereby significantly reducing manufacturing costs. At the same time, it avoids the corrosion and jamming problems that are prone to occur in precision metal transmission components in harsh environments. The structure is more robust and durable, with very little maintenance required, and is especially suitable for long-term reliable operation in humid and dusty pig farm environments.

[0012] This invention achieves an automated cycle of instantaneous forced clearing and slow, gentle reset through the coordinated operation of the clamping and rotating components with torsion springs, greatly improving animal welfare. When the sow lies down and presses against the clamping plate, her weight is quickly and without delay converted into the power to drive the push plate to sweep rapidly, ensuring timely clearing. When the sow stands up and the pressure is released, the push plate does not reset by gravity or impact, but rather slowly and smoothly rotates back to its initial standby position under the gentle torque driven by the pre-torsted torsion springs. This slow reset process effectively eliminates sudden mechanical movements or noise, avoids startling the sow and piglets, and reduces stress response.

[0013] This invention provides active buffer protection for piglets during contact by using a protective component. During the clearing or resetting process of the pusher, if the rubber plate at its end comes into contact with the piglet, the impact force will push the buffer plate to retract into the device frame, thereby compressing the internal spring. At the same time, the third slider slides smoothly along the third groove. This series of actions can transform direct rigid collision into a flexible, energy-absorbing buffering process, greatly reducing the risk of accidental contact causing injury to piglets and achieving safety protection.

[0014] This invention ensures the accuracy and stability of the device's operation through the cooperation of the limiting components and various moving parts. The second slider is fixed to the push plate and constrained to move within the second slide groove, providing precise physical guidance and stroke limit for the push plate's rotation sweeping and resetting process. This prevents the push plate from swaying, overshooting, or positional deviation during operation, ensuring the consistency of the clearing area and the accuracy of the resetting position, thereby improving the overall reliability and predictability of the device's performance.

[0015] This invention, through the integrated design of the sewage discharge components, significantly improves the hygiene management efficiency and automation level of the farrowing crate while achieving the core anti-pressure function. The feces generated daily can be automatically filtered through the sewage discharge screen and fall into the sewage discharge trough for temporary storage, keeping the surface of the farrowing crate relatively clean and dry. By periodically or remotely controlling the opening of the solenoid valve, the waste can be discharged centrally through the sewage discharge pipe. This design transforms the frequent manual manure cleaning work into a manageable automatic or semi-automatic process, reducing labor intensity and helping to improve the breeding environment from the source and reduce the incidence of disease. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the delivery bed body of the present invention; Figure 2 This is a schematic diagram of the tension wire structure of the present invention; Figure 3 This is a schematic diagram of the sliding rod of the present invention; Figure 4 This is a schematic diagram of the structure of the second rotating rod of the present invention; Figure 5 This is a schematic diagram of the structure of the sewage trough of the present invention; Figure 6 This is a schematic diagram of the structure of the second slide groove of the present invention; Figure 7 This is a schematic diagram of the structure of the third groove of the present invention; Figure 8 This is a schematic diagram of the structure of the solenoid valve of the present invention.

[0017] Among them: 1. The delivery bed itself; First rotating rod; 21. Piglet pusher plate; 22. Torsion spring; 31. Sliding rod; 32. First slide groove; 33. First spring; 34. First slider; 35. Sliding sleeve; 36. Clamping plate; 41. Take-up reel; 42. Fixed frame; 43. Second rotating rod; 44. Guide wheel; 45. Tension line; Second slide rail; 51. Second slider; Device frame; 61. Inlet; 62. Spring; 63. Buffer plate; 64. Third slide rail; 65. Third slider; 70. Sewage trough; 71. Sewage outlet; 72. Sewage mesh; 73. Sewage pipe; 74. Solenoid valve. Detailed Implementation

[0018] To make the technical means, creative features, and achieved objectives and effects of this invention easier to understand, the invention is further described below with reference to specific embodiments. However, the following embodiments are merely preferred embodiments of this invention and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments described herein without creative effort are all within the protection scope of this invention. Unless otherwise specified, the experimental methods in the following embodiments are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0019] Example: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a gravity-driven anti-crushing device for piglets includes a farrowing crate body 1. A rotating assembly is provided on the top of the farrowing crate body 1. The rotating assembly includes a first rotating rod 20, which is located on both sides of the top of the farrowing crate body 1. Piglet push plates 21 are fixedly connected to the surface of the first rotating rod 20. A torsion spring 22 is sleeved on the bottom of the surface of the first rotating rod 20. A clamping assembly and a limit assembly are provided on the top of the farrowing crate body 1. A sewage discharge assembly is provided inside the farrowing crate body 1. The clamping assembly includes a sliding rod 30, which is fixedly connected to both sides of the farrowing crate body 1. First grooves 31 are provided on both sides of the sliding rods 30. A first spring 32 is fixedly connected to the bottom of the inner cavity of the first groove 31. A first slider 33 is fixedly connected to the top of the first spring 32. The two first sliders 33 are located on the side away from the first groove 31. A sliding sleeve 34 is fixedly connected, and a clamping plate 35 is fixedly connected to one side of each of the two sliding sleeves 34. A driving assembly is fixedly connected to the surface of the first rotating rod 20. The driving assembly includes a take-up reel 40 and a fixing frame 41. The take-up reel 40 is rotatably connected to the surface of the first rotating rod 20. The fixing frame 41 is fixedly connected to one side of the sliding rod 30. Second rotating rods 42 are rotatably connected to both sides of the inner cavity of the fixing frame 41. A guide wheel 43 is fixedly connected between the two second rotating rods 42. A tension line 44 is sleeved on the surface of the take-up reel 40. One end of the tension line 44 away from the take-up reel 40 is sleeved on the surface of the guide wheel 43. The other end of the tension line 44 away from the guide wheel 43 is fixedly connected to the sliding sleeve 34. The limiting assembly includes a second sliding groove 50. A second slider 51 is slidably connected inside the second sliding groove 50. The top of the second slider 51 is fixedly connected to the piglet pusher plate 21.

[0020] refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, at this stage, the sow is standing or moving freely, and the entire device is silent and ready. The farrowing crate body 1 serves as the installation base, with sliding rods 30 fixed on both sides of its top. The first spring 32 is in its natural state within the first groove 31 on the sliding rod 30, pushing the first slider 33 upward, thereby keeping the sliding sleeve 34 connected to the first slider 33 and the clamping plate 35 fixed on the sliding sleeve 34 in a high position. At the same time, the first rotating rod 20 installed on the farrowing crate body 1 remains stationary under the torque of the torsion spring 22 sleeved at its bottom, so that the piglet pusher plate 21 fixed on the surface of the first rotating rod 20 is in a near-vertical storage position. The second slider 51 fixed on the piglet pusher plate 21 is embedded into one end of the second groove 50 on the top of the farrowing crate body 1 to achieve a limit, and the drive component is in a relaxed state. The fixed frame 41 is installed next to the sliding rod 30, and the guide wheel 43 inside it can rotate freely and wind around the take-up line. One end of the tension line 44 on the reel 40 is fixed to the take-up reel 40, and the other end passes over the guide wheel 43 and is connected to the sliding sleeve 34. At this time, the tension line 44 is relaxed. When the sow begins to lie down, her abdomen presses the clamping plate 35 downward. The clamping plate 35 drives the sliding sleeve 34 to move down along the sliding rod 30. The sliding sleeve 34 forces the first slider 33 to slide down in the first groove 31 and strongly compresses the first spring 32. The downward movement of the sliding sleeve 34 instantly tightens the tension line 44 connected to it. The tension line 44 passes over the guide wheel 43 and pulls the take-up reel 40 to rotate. Since the take-up reel 40 is fixed to the first rotating rod 20, it drives the first rotating rod 20 to overcome the resistance of the torsion spring 22 and rotate rapidly. The rotation of the first rotating rod 20 drives the piglet pusher plate 21 on its surface to swing rapidly forward and downward from the vertical position to clear and sweep. During this process, the second slider 51 fixed on the piglet pusher plate 21 slides along the second groove 50 to ensure the stability of the movement trajectory.

[0021] refer to Figure 1 and Figure 7 As shown, a protective component is provided on the opposite side of the two piglet pushers 21. The protective component includes a device frame 60, which is fixedly connected to the side of the piglet pusher 21 away from the sliding rod 30. An inlet 61 is opened on the side of the device frame 60 away from the piglet pusher 21. A spring 62 is fixedly connected inside the device frame 60. A buffer plate 63 is fixedly connected to the side of the spring 62 away from the device frame 60. A third sliding groove 64 is opened on both sides of the inner cavity of the device frame 60. A third slider 65 is slidably connected inside the third sliding groove 64. The two third sliders 65 are fixedly connected to the buffer plate 63 on the side near the buffer plate 63.

[0022] refer to Figure 1 and Figure 7As shown, the protective components are ready. The device frame 60 is fixed to the end of the piglet pusher plate 21. The spring 62 inside pushes the buffer plate 63 outward, while the third slider 65 on the back of the buffer plate 63 is placed in the third slide groove 64 inside the cavity of the device frame 60. The sewage discharge component is silent. The impact force will cause the buffer plate 63 to retract into the device frame 60, compressing the internal spring 62. At the same time, the third slider 65 on the back of the buffer plate 63 slides along the third slide groove 64 to achieve buffer protection. After the sow is completely flat, her weight continues to press down on the clamping plate 35. The tension line 44 keeps the piglet pusher plate 21 in the unfolded state. At this time, the torsion spring 22 is torsionally stored to the maximum extent.

[0023] refer to Figure 1 , Figure 5 and Figure 8 As shown, the sewage discharge assembly includes a sewage discharge trough 70 and a sewage discharge port 71. The sewage discharge trough 70 is located inside the farrowing crate body 1, and the sewage discharge port 71 is located at the top of the farrowing crate body 1. The sewage discharge port 71 is connected to the sewage discharge trough 70. A sewage discharge mesh plate 72 is fixedly connected between the two sides of the inner cavity of the sewage discharge port 71. The sewage discharge mesh plate 72 is used to allow feces to fall into the interior of the sewage discharge trough 70. The mesh openings on the surface of the sewage discharge mesh plate 72 are small to prevent piglets from falling in. A sewage discharge pipe 73 is fixedly connected inside the sewage discharge trough 70. One end of the sewage discharge pipe 73 passes through the sewage discharge trough 70 and extends to the outside of the sewage discharge trough 70. A solenoid valve 74 is fixedly connected to the surface of the sewage discharge pipe 73 extending to the outside of the sewage discharge trough 70.

[0024] refer to Figure 1 , Figure 5 and Figure 8 As shown, the drain screen 72 on the drain outlet 71 is kept unobstructed, the drain trough 70 below it is empty, and the solenoid valve 74 on the drain pipe 73 is in the closed state. Daily feces can fall through the drain screen 72 of the drain outlet 71 into the drain trough 70 for temporary storage. The drain screen 72 is cleaned regularly to prevent blockage. The condition of the drain trough 70 is checked, and the sewage can be discharged in a concentrated manner by opening the solenoid valve 74 on the drain pipe 73.

[0025] Working principle: Before use: Refer to Figure 1 , Figure 2 and Figure 3As shown, at this stage, the sow is standing or moving freely, and the entire device is silent and ready. The farrowing crate body 1 serves as the installation base, with sliding rods 30 fixed on both sides of its top. A first spring 32, in its natural state, pushes the first slider 33 upward within the first groove 31 on the sliding rod 30. This keeps the sliding sleeve 34 connected to the first slider 33 and the clamping plate 35 fixed on the sliding sleeve 34 in a high position. Simultaneously, the first rotating rod 20 installed on the farrowing crate body 1 remains stationary under the torque of the torsion spring 22 sleeved at its bottom, causing the piglet pusher plate 21 fixed to the surface of the first rotating rod 20 to be in a near-vertical storage position. The second slider 51 fixed on the piglet pusher plate 21 is embedded in the first groove 51 on the top of the farrowing crate body 1. At one end of the second slide groove 50, the limit is achieved, and the drive component is in a relaxed state: the fixed frame 41 is installed next to the sliding rod 30, and the guide wheel 43 inside it can rotate freely. One end of the tension line 44 wound on the take-up reel 40 is fixed to the take-up reel 40, and the other end passes around the guide wheel 43 and is connected to the sliding sleeve 34. At this time, the tension line 44 is relaxed, the protection component is ready, the device frame 60 is fixed to the end of the piglet push plate 21, and the spring 62 inside it pushes the buffer plate 63 outward, while the third slider 65 on the back of the buffer plate 63 is placed in the third slide groove 64 in the inner cavity of the device frame 60. The sewage discharge component is silent: the sewage discharge screen plate 72 on the sewage discharge port 71 is kept unobstructed, the sewage discharge trough 70 below it is empty, and the solenoid valve 74 on the sewage discharge pipe 73 is in a closed state.

[0026] When using: Refer to Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, when the sow begins to lie down, her abdomen presses against the clamping plate 35, causing it to move downwards. The clamping plate 35 drives the sliding sleeve 34 to move downwards along the sliding rod 30. The sliding sleeve 34 forces the first slider 33 to slide down within the first groove 31 and forcefully compresses the first spring 32. The downward movement of the sliding sleeve 34 instantly tightens the tension line 44 connected to it. The tension line 44 passes around the guide wheel 43 and pulls the take-up reel 40 to rotate. Since the take-up reel 40 is fixed to the first rotating rod 20, it drives the first rotating rod 20 to overcome the resistance of the torsion spring 22 and rotate rapidly. The rotation of the first rotating rod 20 causes the piglet pusher plate 21 on its surface to swing rapidly forward and downward from a vertical position, performing a clearing and sweeping action. During this process, the second slider 51 fixed on the piglet pusher plate 21 slides along the second slide groove 50 to ensure a stable movement trajectory. If the piglet pusher plate 21 contacts the piglet, the impact force will cause the buffer plate 63 to retract into the device frame 60, compressing the internal spring 62. At the same time, the third slider 65 on the back of the buffer plate 63 slides along the third slide groove 64 to achieve buffer protection. After the sow is completely lying flat, her weight continues to press down on the clamping plate 35, and the taut tension line 44 keeps the piglet pusher plate 21 in the unfolded state. At this time, the torsion spring 22 is torsionally stored to the maximum extent. Meanwhile, the daily manure can fall into the sewage trough 70 for temporary storage through the sewage discharge screen 72 of the sewage outlet 71.

[0027] After use: Reference Figure 1 , Figure 2 and Figure 3 As shown, when the sow stands up, the abdominal pressure is relieved, the compressed first spring 32 releases its elasticity, pushing the first slider 33 and sliding sleeve 34 to slide up and reset along the sliding rod 30. The clamping plate 35 then returns to its high position. The sliding sleeve 34 moves up, causing the tension line 44 to relax. The elastic potential energy stored in the torsion spring 22 drives the first rotating rod 20 to rotate slowly in the opposite direction, causing the piglet push plate 21 to gently swing back to the vertical waiting position. The second slider 51 also slides in the opposite direction in the second slide groove 50 until the initial limit point. During the reset process of the piglet push plate 21, the spring 62 of the protective component pushes the buffer plate 63 and rubber plate 66 back out of the inlet 61 for preparation. After the device is completely reset, maintenance can be performed: regularly clean the sewage discharge screen 72 to prevent blockage, check the condition of the sewage discharge trough 70, and discharge the sewage by opening the solenoid valve 74 on the sewage discharge pipe 73; at the same time, check whether the moving parts such as the sliding sleeve 34 and guide wheel 43 are flexible, add lubrication if necessary, and ensure that all structures are restored to their initial reliable state, waiting for the next cycle.

[0028] 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 gravity-driven anti-crushing device for piglets, comprising a farrowing crate body (1), characterized in that, The top of the delivery bed body (1) is provided with a rotating assembly, which includes a first rotating rod (20). The first rotating rod (20) is located on both sides of the top of the farrowing bed body (1). The surface of the first rotating rod (20) is fixedly connected with a piglet pusher plate (21), and a torsion spring (22) is sleeved on the bottom of the surface of the first rotating rod (20). The top of the delivery bed body (1) is provided with a clamping component, the top of the delivery bed body (1) is provided with a limiting component, and the interior of the delivery bed body (1) is provided with a sewage discharge component.

2. The piglet anti-crushing device based on gravity transmission according to claim 1, characterized in that, The clamping assembly includes a sliding rod (30), which is fixedly connected to both sides of the delivery bed body (1). A first sliding groove (31) is provided on both sides of the sliding rod (30). A first spring (32) is fixedly connected to the bottom of the inner cavity of the first sliding groove (31). A first slider (33) is fixedly connected to the top of the first spring (32). A sliding sleeve (34) is fixedly connected to the side of the two first sliders (33) away from the first sliding groove (31). A clamping plate (35) is fixedly connected to the side of the two sliding sleeves (34) that are close to each other.

3. The piglet anti-crushing device based on gravity transmission according to claim 1, characterized in that, A drive assembly is fixedly connected to the surface of the first rotating rod (20). The drive assembly includes a take-up reel (40) and a fixed frame (41). The take-up reel (40) is rotatably connected to the surface of the first rotating rod (20). The fixed frame (41) is fixedly connected to one side of the sliding rod (30). Second rotating rods (42) are rotatably connected to both sides of the inner cavity of the fixed frame (41). Guide wheels (43) are fixedly connected between the two second rotating rods (42).

4. A gravity-driven anti-crushing device for piglets according to claim 3, characterized in that, The surface of the take-up reel (40) is fitted with a tension line (44), one end of the tension line (44) away from the take-up reel (40) is fitted onto the surface of the guide wheel (43), and the other end of the tension line (44) away from the guide wheel (43) is fixedly connected to the sliding sleeve (34).

5. A gravity-driven anti-crushing device for piglets according to claim 1, characterized in that, The limiting component includes a second slide groove (50), and a second slider (51) is slidably connected inside the second slide groove (50). The top of the second slider (51) is fixedly connected to the piglet push plate (21).

6. A gravity-driven anti-crushing device for piglets according to claim 1, characterized in that, A protective component is provided on the opposite side of the two piglet pushers (21). The protective component includes a device frame (60). The device frame (60) is fixedly connected to the side of the piglet pusher (21) away from the sliding rod (30). An inlet (61) is opened on the side of the device frame (60) away from the piglet pusher (21). A spring (62) is fixedly connected inside the device frame (60). A buffer plate (63) is fixedly connected on the side of the spring (62) away from the device frame (60).

7. A gravity-driven anti-crushing device for piglets according to claim 6, characterized in that, The inner cavity of the device frame (60) is provided with a third slide groove (64) on both sides. A third slider (65) is slidably connected inside the third slide groove (64). The two third sliders (65) are fixedly connected to the buffer plate (63) on the side near the buffer plate (63).

8. A gravity-driven anti-crushing device for piglets according to claim 1, characterized in that, The sewage discharge assembly includes a sewage discharge trough (70) and a sewage discharge port (71). The sewage discharge trough (70) is located inside the farrowing crate body (1), and the sewage discharge port (71) is located at the top of the farrowing crate body (1). The sewage discharge port (71) is connected to the sewage discharge trough (70). A sewage discharge mesh plate (72) is fixedly connected between the two sides of the inner cavity of the sewage discharge port (71). The sewage discharge mesh plate (72) is used to allow feces to fall into the interior of the sewage discharge trough (70). The mesh openings on the surface of the sewage discharge mesh plate (72) are small to prevent piglets from falling in. A sewage discharge pipe (73) is fixedly connected inside the sewage discharge trough (70). One end of the sewage discharge pipe (73) passes through the sewage discharge trough (70) and extends to the outside of the sewage discharge trough (70). A solenoid valve (74) is fixedly connected to the surface of the sewage discharge pipe (73) extending to the outside of the sewage discharge trough (70).

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