Food slitting device for food safety detection

By designing a food cutting device with an electric hydraulic cylinder and an adjustable cutter, the problem of uneven cutting of food samples was solved, uniform cutting of samples was achieved, and the detection quality was improved.

CN223332727UActive Publication Date: 2025-09-12NORTHWEST A & F UNIV
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Patent Information

Application Number
CN202422311072.X
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-09-23
Publication Date
2025-09-12
Estimated Expiration
2034-09-23

AI Technical Summary

Technical Problem

In existing food safety testing, food samples are not cut evenly, resulting in inconsistent testing quality.

Method used

A food cutting device consisting of a base, a frame, a top electric hydraulic cylinder, a cutting mechanism and a cutting board was designed. The cutter was driven by the electric hydraulic cylinder, and the adjustable cutter spacing and angle were combined to achieve uniform cutting of the sample.

Benefits of technology

The samples are cut into uniform thickness and size, which improves the accuracy and consistency of food testing.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of food detection, in particular to a food slitting device for food safety detection, which comprises a base, a frame, a top electric hydraulic cylinder, a cutting mechanism and a chopping board, the frame is arranged in the middle of the upper end of the base, the top electric hydraulic cylinder is arranged at the upper end of the frame, and a piston rod of the top electric hydraulic cylinder extends into the frame. A limiting rod is arranged at the end of a piston rod, extending into the frame, of the top electric hydraulic cylinder, the two ends of the limiting rod are in sliding fit with the frame, and a cutting mechanism is arranged at the lower end of the limiting rod. A controller is arranged on one side of the frame; the cutting mechanism comprises a middle plate body, end plate bodies, a screw rod and a cutter, an adjusting sliding groove penetrating through the middle plate body is formed in the middle plate body, the end plate bodies are symmetrically arranged on the two sides of the middle plate body, an adjusting sliding plate is arranged on one side of each end plate body, and one end of each adjusting sliding plate is inserted into the corresponding adjusting sliding groove and is in sliding fit with the corresponding adjusting sliding groove.
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Description

Technical Field

[0001] The utility model relates to the technical field of food detection, in particular to a food cutting device for food safety detection. Background Art

[0002] Food safety testing is to detect harmful substances in food according to national standards. It mainly tests the quality of food raw materials, auxiliary materials, semi-finished products, finished products and by-products to ensure product quality. Food inspection includes sensory testing of food, testing of nutrients, additives, and harmful substances in food;

[0003] To ensure the accuracy of the data, the food will be divided into multiple samples according to the testing requirements, and then tested one by one;

[0004] Existing food safety testing and cutting methods are mostly done manually, which will result in samples of varying thickness and size, affecting the quality of subsequent food sample testing.

[0005] Therefore, in order to solve the technical problems described above, there is an urgent need for a food cutting device for food safety testing. Utility Model Content

[0006] The technical problem to be solved by the utility model is to overcome the defects of the above-mentioned technology and provide a food cutting device for food safety detection.

[0007] In order to solve the above technical problems, the technical solution provided by the present invention is a food cutting device for food safety testing, comprising:

[0008] A base, a frame, a top electric hydraulic cylinder, a cutting mechanism and an anvil, wherein a frame is provided in the middle of the upper end of the base, a top electric hydraulic cylinder is provided on the upper end of the frame, a piston rod of the top electric hydraulic cylinder extends into the interior of the frame, a limiting rod is provided at the end of the piston rod of the top electric hydraulic cylinder extending into the interior of the frame, both ends of the limiting rod are slidably fitted with the frame, a cutting mechanism is provided at the lower end of the limiting rod, and the anvil is arranged above the base;

[0009] A controller is provided on one side of the frame;

[0010] The cutting mechanism comprises a middle plate body, an end plate body, a screw and a cutter, the middle plate body is provided with an adjusting slide running through the middle plate body, the end plate bodies are symmetrically provided with end plates on both sides of the middle plate body, one side of the end plate body is provided with an adjusting slide, one end of the adjusting slide is inserted into the adjusting slide and slidably cooperates with the adjusting slide, the other side of the end plate body is provided with a mounting slot, the side ends of the end plate body are provided with an adjusting slot connected to the mounting slot, the cutter is evenly arranged between the two end plate bodies, the upper end of the cutter body is provided with a mounting rod, the two ends of the mounting rod are respectively installed in the adjusting slots on both sides, the two ends of the mounting rod are provided with a first screw hole, the first screw hole is provided with a first bolt, the mounting rod is fixed in the adjusting slot by the first bolt, the upper end of the middle plate body is provided with a screw, the top of the screw is provided with a limit plate, and the screw is provided with a fixing nut;

[0011] A T-shaped circular hole is provided in the middle of the limiting rod, and the limiting plate and the screw rod are both rotatably arranged in the T-shaped circular hole.

[0012] As an improvement, a second screw hole is symmetrically provided on the middle plate body, and the second screw hole penetrates into the adjustment slide groove. A second bolt is provided in the second screw hole, and the second bolt cooperates with the adjustment slide to limit the adjustment slide.

[0013] As an improvement, a first scale is provided below the adjustment slot on the end plate.

[0014] As an improvement, the frame includes support legs, a cross plate and side electric hydraulic cylinders, the support legs are symmetrically arranged on the base, the upper ends of the support legs are provided with side electric hydraulic cylinders, the two ends of the cross plate are respectively provided on the two side electric hydraulic cylinders, the top electric hydraulic cylinder is provided on the cross plate, and the controller is provided on one of the support legs;

[0015] A first T-shaped sliding groove is provided on the inner side of the supporting leg, and first T-shaped sliding blocks are symmetrically provided on both sides of the limiting rod. The first T-shaped sliding blocks are slidably matched with the first T-shaped sliding groove.

[0016] As an improvement, the first T-shaped sliding groove extends from below the support leg to above the support leg.

[0017] As an improvement, the upper end of the base is provided with a second T-shaped groove that passes through the base, and the lower end of the anvil is provided with a second T-shaped slider, and the second T-shaped slider and the second T-shaped groove are slidably matched.

[0018] As an improvement, support rods are symmetrically provided at both ends of the anvil, a tube body is provided on the support rod, a round rod is provided within the tube body, a third screw hole is provided on the tube body, a third bolt is provided in the third screw hole, and the third bolt cooperates with the round rod to limit the round rod;

[0019] One end of the round rod is provided with a slot, a T-shaped top plate is provided in the slot, one end of the round rod is provided with a fourth screw hole that passes through the slot, a fourth bolt is provided in the fourth screw hole, and the fourth bolt cooperates with the T-shaped top plate to limit the T-shaped top plate.

[0020] Compared with the prior art, the advantages of the present invention are as follows: 1. The cutters are evenly arranged between the two end plates, so that slice samples of the same thickness can be cut. A mounting rod is provided at the upper end of the cutter, and both ends of the mounting rod are respectively installed in the adjustment slots on both sides. Both ends of the mounting rod are provided with a first screw hole, and a first bolt is provided in the first screw hole. The mounting rod is fixed in the adjustment slot by the first bolt, so that the spacing between the cutters can be adjusted, so that slice samples of different thicknesses can be cut according to usage requirements. In addition, the number of cutters can be adjusted, so that the number of slice samples cut out of a single sex can be adjusted.

[0021] 2. A T-shaped circular hole is provided in the middle of the limiting rod. The limiting plate and the screw are both rotatably arranged in the T-shaped circular hole. A fixing nut is provided on the screw, so that the cutting mechanism can be rotated to cut the sample into pieces, so as to cut out the required sample pieces as needed;

[0022] 3. An adjustment slot is provided in the middle plate body that passes through the middle plate body. End plates are symmetrically provided on both sides of the middle plate body. An adjustment slide is provided on one side of the end plate body. One end of the adjustment slide is inserted into the adjustment slot and slides with the adjustment slot. In this way, the distance between the end plates can be adjusted to facilitate the replacement and installation of cutters of different lengths. This device can adjust the length of the cutter to the corresponding length according to the width of the sample to adapt to different food testing samples.

[0023] 4. A first scale is provided below the adjustment slot on the end plate to facilitate better adjustment of the spacing between the cutters;

[0024] 5. Support rods are symmetrically provided at both ends of the chopping board, and a tube body is provided on the support rods, and a round rod is provided in the tube body. A third screw hole is provided on the tube body, and a third bolt is provided in the third screw hole. The third bolt cooperates with the round rod to limit the round rod; a notch is provided at one end of the round rod, and a T-shaped top plate is provided in the notch; a fourth screw hole is provided at one end of the round rod and passes through the notch, and a fourth bolt is provided in the fourth screw hole. The fourth bolt cooperates with the T-shaped top plate to limit the T-shaped top plate. In this way, the position of the T-shaped top plate can be adjusted forward and backward and up and down, so that the T-shaped top plate can limit or squeeze the food sample, making it easier for the cutter to cut the food sample. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The utility model is a front view of a food cutting device for food safety testing.

[0026] Figure 2 The utility model is a top view of a food cutting device for food safety testing.

[0027] Figure 3 The utility model is a three-dimensional structural diagram of a food cutting device for food safety testing.

[0028] Figure 4 This is a reference diagram of a food cutting device for food safety testing in a disassembled state according to the present invention.

[0029] Figure 5 The utility model is a structural schematic diagram of a cutter of a food cutting device for food safety testing.

[0030] Figure 6 yes Figure 2 Cross-sectional view at AA in the middle.

[0031] Figure 7 yes Figure 4 A partial enlarged view of point B in the middle.

[0032] Figure 8 yes Figure 3 A partial enlarged view of point C in the middle.

[0033] Figure 9 yes Figure 6 A partial enlarged view of point D in the middle.

[0034] Figure 10 yes Figure 4 A partial enlarged view of point E in the middle.

[0035] As shown in the figure:

[0036] 100, base, 101, second T-shaped slide, 102, second T-shaped slider, 200, top electric hydraulic cylinder, 201, limit rod, 202, T-shaped round hole, 203, limit plate, 300, anvil, 301, support rod, 302, tube, 303, round rod, 304, third screw hole, 305, third bolt, 306, notch, 307, T-shaped top plate, 308, fourth screw hole, 309, fourth bolt, 400, controller, 501, middle plate, 50 2. End plate, 503. Screw, 504. Cutter, 505. Adjusting slot, 506. Adjusting slide, 507. Mounting slot, 508. Adjusting slot, 509. Mounting rod, 510. First screw hole, 511. First bolt, 512. Fixing nut, 513. Second screw hole, 514. Second bolt, 515. First scale, 601. Support leg, 602. Cross plate, 603. Side electric hydraulic cylinder, 604. First T-type slot, 605. First T-type slider. DETAILED DESCRIPTION

[0037] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0038] Combined with attachment Figure 1-10 , a food cutting device for food safety testing, comprising:

[0039] A base 100, a frame, a top electric hydraulic cylinder 200, a cutting mechanism and an anvil 300. A frame is provided in the middle of the upper end of the base 100, a top electric hydraulic cylinder 200 is provided on the upper end of the frame, a piston rod of the top electric hydraulic cylinder 200 extends into the interior of the frame, a limiting rod 201 is provided at the end of the piston rod of the top electric hydraulic cylinder 200 extending into the interior of the frame, both ends of the limiting rod 201 are slidably fitted with the frame, a cutting mechanism is provided at the lower end of the limiting rod 201, and the anvil 300 is arranged above the base 100;

[0040] A controller 400 is provided on one side of the frame;

[0041] The cutting mechanism includes a middle plate 501, an end plate 502, a screw 503 and a cutter 504. The middle plate 501 is provided with an adjustment slot 505 that passes through the middle plate 501. The end plates 502 are symmetrically provided on both sides of the middle plate 501. An adjustment slide 506 is provided on one side of the end plate 502. One end of the adjustment slide 506 is inserted into the adjustment slot 505 and slides with the adjustment slot 505. The other side of the end plate 502 is provided with a mounting slot 507. The side end of the end plate 502 is provided with an adjustment slot 508 that is connected to the mounting slot 507. The cutter 504 is evenly arranged between the two end plates 502. The upper end of the cutter 504 is provided with The mounting rod 509 has two ends respectively mounted in the adjustment slots 508 on both sides, so that the distance between the two end plates 502 can be adjusted, making it convenient to replace cutters 504 of different lengths according to the width of the food sample. The mounting rod 509 has a first screw hole 510 at both ends, and a first bolt 511 is installed in the first screw hole 510. The mounting rod 509 is fixed in the adjustment slot 508 by the first bolt 511, so that the distance between the cutters 504 can be adjusted to cut sample slices of different thicknesses. The upper end of the middle plate 501 is provided with a screw rod 503, the top of the screw rod 503 is provided with a limit plate 203, and the screw rod 503 is provided with a fixing nut 512;

[0042] A T-shaped circular hole 202 is provided in the middle of the limiting rod 201, and the limiting plate 203 and the screw 503 are both rotatably arranged in the T-shaped circular hole 202, so that the cutting mechanism can be rotated to adjust for cross cutting, oblique cutting or longitudinal cutting, etc.

[0043] The middle plate 501 is symmetrically provided with a second screw hole 513 , which penetrates into the adjustment slide groove 505 . A second bolt 514 is provided in the second screw hole 513 , and the second bolt 514 cooperates with the adjustment slide 506 to limit the adjustment slide 506 .

[0044] A first scale 515 is provided below the adjustment slot 508 on the end plate 502 to facilitate the operator to adjust the spacing of the cutters 504 according to cutting requirements.

[0045] The frame includes support legs 601, a transverse plate 602 and a side electric hydraulic cylinder 603. The support legs 601 are symmetrically arranged on the base 100. The upper ends of the support legs 601 are provided with side electric hydraulic cylinders 603. The two ends of the transverse plate 602 are respectively arranged on two side electric hydraulic cylinders 603. The top electric hydraulic cylinder 200 is arranged on the transverse plate 602. The height of the transverse plate 602 and the top electric hydraulic cylinder 200 can be adjusted. In this way, when the top electric hydraulic cylinder 200 is fully extended, the bottom of the cutter 504 is just in contact with the upper surface of the chopping board 300. On the one hand, the food sample can be completely cut, and on the other hand, the cutter 504 will not collide with the chopping board 300 to damage the cutter 504. The controller 400 is arranged on one of the support legs 601 to facilitate operation by the operator. The controller 400 is connected to the top electric hydraulic cylinder 200, the side electric hydraulic cylinder 603 and other electric components. The controller 400 can accurately control the operation of each electric component to achieve functions such as the lifting and lowering adjustment of the cutting mechanism;

[0046] A first T-shaped slot 604 is provided on the inner side of the support leg 601, and first T-shaped sliders 605 are symmetrically provided on both sides of the limiting rod 201. The first T-shaped slider 605 and the first T-shaped slot 604 slide together to ensure that the limiting rod 201 slides smoothly in the vertical direction, thereby ensuring that the cutter 504 moves smoothly in the vertical direction.

[0047] The first T-shaped sliding groove 604 extends from below the support leg 601 to above the support leg 601 .

[0048] The upper end of the base 100 is provided with a second T-shaped slide 101 that passes through the base 100, and the lower end of the chopping board 300 is provided with a second T-shaped slider 102. The second T-shaped slider 102 and the second T-shaped slide 101 are slidably engaged with each other, so that the position of the chopping board 300 can be adjusted forward and backward, so as to adjust the position of the food sample on the chopping board 300.

[0049] The anvil 300 has support rods 301 symmetrically provided at both ends. A tubular body 302 is provided on the support rod 301. A round rod 303 is provided inside the tubular body 302. A third screw hole 304 is provided on the tubular body 302. A third bolt 305 is provided inside the third screw hole 304. The third bolt 305 cooperates with the round rod 303 to limit the round rod 303.

[0050] One end of the round rod 303 is provided with a slot 306, and a T-shaped top plate 307 is provided in the slot 306. One end of the round rod 303 is provided with a fourth screw hole 308 that penetrates into the slot 306, and a fourth bolt 309 is provided in the fourth screw hole 308. The fourth bolt 309 cooperates with the T-shaped top plate 307 to limit the T-shaped top plate 307.

[0051] When the utility model is implemented,

[0052] During use, the operator first adjusts the height of the cutting mechanism according to the cutting requirements. The operator controls the two side electric hydraulic cylinders 603 to rise and fall via the controller 400, so that when the piston rod of the top electric hydraulic cylinder 200 is fully extended, the lower end of the cutter 504 can just contact the top of the cutting board 300, so as to properly cut the food sample and ensure that the cutter 504 does not collide with the cutting board 300.

[0053] Then, according to the width of the food sample, a cutter 504 of appropriate length is selected. Then, the end plates 502 are pulled out so that the width between the two end plates 502 corresponds to the cutter 504. Then, the cutter 504 is installed in the installation slot 507 via the installation rod 509. Then, the first bolt 511 is screwed through the adjustment slot 508 into the first screw hole 510 to secure the cutter 504.

[0054] Adjust the spacing between the cutters 504 according to the required thickness of the sample to be cut. To do this, loosen the first bolt 511 and then move the cutter 504. The end plate 502 is provided with a first scale 515. The spacing between the cutters 504 can be adjusted according to the first scale 515. After adjustment, tighten the first bolt 511.

[0055] The food sample to be cut is then placed directly under the cutter 504 , and the round rod 303 is then pushed to bring the T-shaped top plate 307 close to the food sample. The T-shaped top plate 307 is then adjusted up and down as needed. During adjustment, the fourth bolt 309 is unscrewed, and the T-shaped top plate 307 is then moved up and down. After adjustment, the fourth bolt 309 is screwed into the fourth screw hole 308 to secure the T-shaped top plate 307. The round rod 303 is then further pushed to allow both T-shaped top plates 307 to limit or squeeze the food sample, thereby preventing the food sample from moving or deforming during cutting.

[0056] Then, the controller 400 activates the top electric hydraulic cylinder 200, which drives the cutter 504 downward to slice the food sample. When slicing is required again, the cutting board 300 is pushed along the second T-shaped slide 101 to position the uncut food sample directly under the cutter 504, allowing the cutter 504 to cut the food sample again.

[0057] When cutting is required, the fixing nut 512 can be loosened, and then the cutting mechanism can be rotated 90 degrees, and then cut again, so that the food sample can be cross-cut and the sample pieces can be cut;

[0058] The angle of the cutting mechanism can be adjusted as needed to cut out different samples.

[0059] In the description of the embodiments of the present invention, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the product of the utility model is usually placed when in use. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, it should not be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0060] Furthermore, the use of terms such as "horizontal," "vertical," and "overhanging" does not necessarily imply that the component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," not that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0061] In the description of the embodiments of the present invention, “a plurality of” means at least 2.

[0062] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0063] The above description of the present invention and its embodiments is non-limiting. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if a person skilled in the art is inspired by the above, and does not deviate from the purpose of the present invention, without inventive design, a structure and embodiment similar to the technical solution should fall within the scope of protection of the present invention.

Claims

1. A food cutting device for food safety testing, characterized in that: include: A base (100), a frame, a top electric hydraulic cylinder (200), a cutting mechanism and an anvil (300), wherein the frame is provided at the middle of the upper end of the base (100), the top electric hydraulic cylinder (200) is provided at the upper end of the frame, the piston rod of the top electric hydraulic cylinder (200) extends into the interior of the frame, the end of the piston rod of the top electric hydraulic cylinder (200) extending into the interior of the frame is provided with a limiting rod (201), both ends of the limiting rod (201) are slidably matched with the frame, the lower end of the limiting rod (201) is provided with a cutting mechanism, and the anvil (300) is arranged above the base (100); A controller (400) is provided on one side of the frame; The cutting mechanism comprises a middle plate (501), an end plate (502), a screw (503) and a cutter (504); an adjusting slot (505) penetrating the middle plate (501) is provided in the middle plate (501); end plates (502) are symmetrically provided on both sides of the middle plate (501); an adjusting slide plate (506) is provided on one side of the end plate (502); one end of the adjusting slide plate (506) is inserted into the adjusting slot (505) and slides with the adjusting slot (505); the other side of the end plate (502) is provided with a mounting groove (507); the side end of the end plate (502) is provided with an adjusting slot (506) connected to the mounting groove (507); 8), the cutter (504) is evenly arranged between the two end plates (502), the upper end of the cutter (504) is provided with a mounting rod (509), both ends of the mounting rod (509) are respectively installed in the adjustment slots (508) on both sides, both ends of the mounting rod (509) are provided with a first screw hole (510), a first bolt (511) is provided in the first screw hole (510), the mounting rod (509) is fixed in the adjustment slot (508) by the first bolt (511), the upper end of the middle plate (501) is provided with a screw rod (503), the top of the screw rod (503) is provided with a limiting plate (203), and the screw rod (503) is provided with a fixing nut (512); A T-shaped circular hole (202) is provided in the middle of the limiting rod (201), and the limiting plate (203) and the screw rod (503) are both rotatably arranged in the T-shaped circular hole (202).

2. A food cutting device for food safety testing according to claim 1, characterized in that: The middle plate (501) is symmetrically provided with a second screw hole (513), which penetrates into the adjustment slide groove (505), and a second bolt (514) is provided in the second screw hole (513), and the second bolt (514) cooperates with the adjustment slide plate (506) to limit the adjustment slide plate (506).

3. The food cutting device for food safety testing according to claim 1, characterized in that: A first scale (515) is provided below the adjustment slot (508) on the end plate (502).

4. The food cutting device for food safety testing according to claim 1, characterized in that: The frame comprises support legs (601), a transverse plate (602) and side electric hydraulic cylinders (603); the support legs (601) are symmetrically arranged on the base (100); the upper ends of the support legs (601) are provided with side electric hydraulic cylinders (603); the two ends of the transverse plate (602) are respectively arranged on the two side electric hydraulic cylinders (603); the top electric hydraulic cylinder (200) is arranged on the transverse plate (602); and the controller (400) is arranged on one of the support legs (601); A first T-shaped sliding groove (604) is provided on the inner side of the support leg (601), and first T-shaped sliding blocks (605) are symmetrically provided on both sides of the limiting rod (201), and the first T-shaped sliding blocks (605) and the first T-shaped sliding groove (604) are slidably matched.

5. The food cutting device for food safety testing according to claim 4, characterized in that: The first T-shaped sliding groove (604) extends from below the supporting leg (601) to above the supporting leg (601).

6. The food cutting device for food safety testing according to claim 1, characterized in that: The upper end of the base (100) is provided with a second T-shaped slide groove (101) that passes through the base (100), and the lower end of the anvil (300) is provided with a second T-shaped slider (102), and the second T-shaped slider (102) and the second T-shaped slide groove (101) are slidably matched.

7. A food cutting device for food safety testing according to claim 6, characterized in that: The anvil (300) is symmetrically provided with support rods (301) at both ends, the support rods (301) are provided with a tube body (302), a round rod (303) is provided in the tube body (302), a third screw hole (304) is provided on the tube body (302), a third bolt (305) is provided in the third screw hole (304), and the third bolt (305) cooperates with the round rod (303) to limit the round rod (303); One end of the round rod (303) is provided with a notch (306), a T-shaped top plate (307) is provided in the notch (306), one end of the round rod (303) is provided with a fourth screw hole (308) penetrating into the notch (306), a fourth bolt (309) is provided in the fourth screw hole (308), and the fourth bolt (309) cooperates with the T-shaped top plate (307) to limit the T-shaped top plate (307).