A device for cooling after stir-frying

Abstract

A cooling device after roasting includes a storage section with opening and closing mechanisms at both ends, sealing mechanisms at the lower sides of both ends, and a swaying mechanism at the bottom. This invention improves cooling efficiency and uniformity: during natural cooling, the swaying mechanism continuously oscillates the storage section, causing the aconite to constantly turn, thus significantly accelerating heat dissipation and improving cooling uniformity and efficiency. This invention also prevents contamination and moisture absorption: the storage section is a sealed, suspended structure, which prevents external impurities from contaminating the aconite and avoids ground moisture intrusion, ensuring the quality of the aconite.

Description

Technical Field

[0001] This invention relates to the field of traditional Chinese medicine processing technology, and in particular to a device for cooling after stir-frying. Background Technology

[0002] Aconite is a commonly used traditional Chinese medicine in clinical practice. Its raw form is toxic and needs to be processed to reduce its toxicity before use. Among them, the sand-frying method is one of the important methods for processing aconite. Usually, medium-fine river sand is placed in the container of a stir-frying machine and heated until it becomes slippery. Then, aconite is added and stir-fried until its outer skin turns yellowish-brown, its cross-section is yellow, its texture is loose and brittle, its aroma is fragrant, its taste is slightly bitter, and it has a slight numbing sensation on the tongue. Then, the river sand is sieved out, and the processed product is taken out and cooled.

[0003] In existing processes, roasted aconite is usually placed directly on a drying cloth or board for natural cooling. This cooling method has the following drawbacks: First, during the cooling process, moisture in the air easily adheres to the surface of the aconite, causing it to absorb moisture and soften, or even become damp and deteriorate, affecting the quality of the finished product and its storage stability. Second, a large amount of river sand often adheres to the surface of the roasted aconite. Existing methods require sieving to remove the river sand after cooling, but during the cooling process, the aconite shrinks due to heat loss, which can cause some river sand to become embedded in the wrinkled surface or cracks of the aconite, increasing the difficulty of subsequent sieving and resulting in sand residue, which affects the quality of the medicinal material and the safety of medication. Summary of the Invention

[0004] This invention provides a device for cooling after stir-frying, which overcomes the shortcomings of the prior art and solves the problems existing in the cooling process of stir-fried aconite, and has strong practicality.

[0005] In order to achieve the objectives of this invention, the following technologies are proposed: A device for cooling food after stir-frying includes a storage section, with opening and closing mechanisms at both ends of the storage section, sealing mechanisms at the lower sides of both ends of the storage section, and a swinging mechanism at the bottom of the storage section.

[0006] Furthermore, the storage section includes a rectangular lower plate with multiple holes. A frame plate is fixed to the outer periphery of the lower plate, and discharge ports are respectively opened at both ends of the frame plate along its length. A cover plate is welded to the upper side of the frame plate, and a rectangular hole is opened on the cover plate. A slag collection tray is welded to the lower side of the lower plate, and slag discharge holes are respectively opened at both ends of the slag collection tray. Lower extension plates are welded to both ends of the slag collection tray, and an inclined bucket plate is welded to the lower side of the slag collection tray. The lower end of the inclined bucket plate is inclined to the lower extension plate, and there is a gap between the inclined bucket plate and the lower end of the lower extension plate. Side bucket plates are bent at both ends of the inclined bucket plate and welded to the lower extension plate. The inclined bucket plate, side bucket plates, and lower extension plate form a collection hopper that surrounds the slag discharge holes and has a discharge port at the bottom.

[0007] Furthermore, a lower extension frame is welded to the cover plate extending downwards. The lower extension frame has a tapered structure, and the size of the lower end of the lower extension frame is smaller than the size of its upper end.

[0008] Furthermore, inclined plates are welded to both ends of the slag tray, with the outer ends of the inclined plates extending downwards and welded to the slag discharge holes.

[0009] Furthermore, the opening and closing mechanism includes an embedded disc embedded in the discharge port. An outer plate is welded to the outer end of the embedded disc. The outer plate is located outside the frame plate. Both ends of the outer plate are bent into folded plates along its length. A pair of limiting screws are threadedly connected to the folded plates. A movable vertical plate is fitted onto the rod of the limiting screw. A pair of strip holes are opened parallel to the length of the movable vertical plate. The rod of the limiting screw passes through the strip holes. The movable vertical plate is located outside the folded plates. Both ends of the movable vertical plate are formed with inner protrusions. A slot is formed on the lower side of the inner protrusion. A locking screw is movably installed in the slot. The inner end of the locking screw is threadedly connected to the frame plate.

[0010] Furthermore, each pair of locking screws is fitted with an inner pressure plate, the outer side of which abuts against an inner pressure spring, the outer end of which abuts against the inner end of the locking screw head, and the inner side of the inner pressure plate is formed with a locking block in the shape of a right-angled trapezoid. The upper side of the locking block is an inclined surface, and the inner end of the inclined surface extends downward. The outer wall of the inner convex plate is formed with a locking block in the shape of a right-angled trapezoid. The lower side of the locking block is an inclined surface, and the outer end of the inclined surface extends upward.

[0011] Furthermore, the sealing mechanism includes a pair of protrusions welded to the outer side of the lower extension plate. A hinge screw is threaded onto the protrusion. A rotating bar is rotatably mounted on the shaft of the hinge screw. A concave cover is formed on the lower side of the rotating bar. The concave cover is located below the feed port. A latch is formed with an opening at the inner end of the rotating bar. A latching screw passes through the latch. An inner bar is welded to the outer side of the inclined bucket plate. A guide screw is threaded onto the inner bar. An inner top bar is fitted onto the guide screw. The shaft of the latching screw is threaded to both ends of the inner top bar. A locking spring is fitted onto the outer end of the latching screw. The inner end of the locking spring abuts against the inner top bar. The outer end of the locking spring abuts against the cap of the guide screw.

[0012] Furthermore, the oscillating mechanism includes a base, with sidewalls welded to opposite sides of the base. A pair of concave inner frames are fixed to the base by bolts. A first shaft is rotatably mounted on the upper end of the inner frames. The outer end of the first shaft passes through the sidewalls and a gear is fixed to the outer end of the first shaft. The gear is located outside the sidewalls. A driven bevel gear is fixed to the inner end of the first shaft, and a driving bevel gear meshes with the driven bevel gear. Multiple support rods are fixed to the base, and an upper end plate is fixed to the upper end of the support rods. A motor is fixed to the upper end plate, and the output shaft of the motor is fixed to the driving bevel gear. The driven bevel gear is located on both sides of the driving bevel gear. A second shaft is rotatably mounted on the upper end of the inner frames and is rotatably mounted on the sidewalls. A rotating horizontal plate is fixed to the inner end of the second shaft, and a connecting seat is formed on the rotating horizontal plate. The connecting seat is fixed to the slag tray by bolts. An incomplete gear is fixed to the outer end of the second shaft. The incomplete gear is located outside the sidewalls and meshes with a gear located on the same side, and the incomplete gears have an included angle.

[0013] Furthermore, the base includes a pair of concave seats fixed by bolts, multiple inner crossbars welded between the concave seats, an arc-shaped groove opened in the vertical section of the concave seat, a roller movably installed in the arc-shaped groove, a third shaft rotatably installed in the roller, and the third shaft fixed to the end of the rotating crossbar.

[0014] The advantages of the above technical solution are: This invention improves cooling efficiency and uniformity: during the natural cooling process, the swing mechanism drives the storage section to swing continuously, causing the aconite to tumble constantly, thereby significantly accelerating heat dissipation and improving cooling uniformity and efficiency.

[0015] This invention avoids contamination and moisture: the storage compartment is a sealed, suspended structure, which can prevent external impurities from contaminating the aconite and also prevent ground moisture from intruding, thus ensuring the quality of the aconite.

[0016] This invention automatically separates and collects river sand: during the oscillation process, the river sand and roasting residue are screened through the storage section and fall into the holding hopper below, effectively preventing the river sand from adhering to or embedding into the surface of the aconite after cooling, which facilitates subsequent cleaning and material separation.

[0017] This invention facilitates material discharge and collection: after cooling, the storage section can be adjusted to a downward tilt position, and the discharge can be controlled by the opening and closing mechanism to achieve smooth discharge of Aconitum carmichaelii, making the operation simple.

[0018] This invention operates smoothly and saves energy: by using an arc-shaped groove structure to reasonably limit the swing angle, it ensures smooth swing, reduces vibration, reduces motor load, increases the service life of the mechanism, and saves operating energy consumption. Attached Figure Description

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will now be described in further detail with reference to the accompanying drawings.

[0020] Figure 1 A three-dimensional structural diagram of the device for cooling after stir-frying is shown.

[0021] Figure 2 A three-dimensional structural diagram of the storage section is shown.

[0022] Figure 3 A three-dimensional structural diagram of the lower part of the storage section is shown.

[0023] Figure 4 A three-dimensional structural diagram of the opening and closing mechanism is shown.

[0024] Figure 5 A three-dimensional structural diagram of the sealing mechanism is shown.

[0025] Figure 6 A first-view three-dimensional structural diagram of the swing mechanism is shown.

[0026] Figure 7 A second-view three-dimensional structural diagram of the swing mechanism is shown. Detailed Implementation

[0027] like Figure 1 As shown, a device for cooling food after stir-frying includes a storage section 1, with opening and closing mechanisms 2 at both ends of the storage section 1, sealing mechanisms 3 at the lower sides of both ends of the storage section 1, and a swinging mechanism 4 at the bottom of the storage section 1.

[0028] like Figure 2 and Figure 3 As shown, the storage section 1 includes a lower plate 100 with a rectangular structure. The lower plate 100 has multiple holes. A frame plate 101 is fixed to the outer periphery of the lower plate 100. Discharge ports are respectively opened at both ends of the frame plate 101 in the length direction. A cover plate 102 is welded to the upper side of the frame plate 101. A rectangular hole is opened on the cover plate 102. A lower extension frame 103 is welded to the lower extension frame 103 extending downward from the cover plate 102. The lower extension frame 103 has a conical structure, and the size of the lower end of the lower extension frame 103 is smaller than the size of its upper end.

[0029] A slag collection tray 104 is welded to the lower side of the lower plate 100. Optionally, a fan can be installed on the slag collection tray 104 to quickly cool the aconite. Slag discharge holes 106 are opened at both ends of the slag collection tray 104 along its length. Inclined plates 107 are welded to both ends of the slag collection tray 104. The outer end of the inclined plate 107 extends downward at an angle. The inclined plate 107 is welded to the slag discharge hole 106. There is a gap between the lower end of the inclined plate 107 and the inner side of the lower extension plate 105. The slag collection pan 104 has a lower extension plate 105 welded to both ends. An inclined hopper plate 109 is welded to the lower side of the slag collection pan 104. The lower end of the inclined hopper plate 109 is inclined to the lower extension plate 105, and there is a gap between the inclined hopper plate 109 and the lower end of the lower extension plate 105. The two ends of the inclined hopper plate 109 are bent and welded to the lower extension plate 105. The inclined hopper plate 109, the side hopper plate 110 and the lower extension plate 105 form a collection hopper that covers the slag discharge hole 106 and has a discharge port at the bottom.

[0030] like Figure 4 As shown, the opening and closing mechanism 2 includes an embedded disc 200 embedded in the discharge port. An outer plate 201 is welded to the outer end of the embedded disc 200. The outer plate 201 is located outside the frame plate 101. The two ends of the outer plate 201 are bent into folding plates 202 along the length direction. A pair of limiting screws 203 are threadedly connected to the folding plates 202. A movable vertical plate 204 is sleeved on the rod part of the limiting screw 203. A pair of strip holes 205 are opened parallel to the length direction of the movable vertical plate 204. The rod part of the limiting screw 203 passes through the strip holes 205. The movable vertical plate 204 is located outside the folding plate 202. The two ends of the movable vertical plate 204 are respectively formed with inner protrusions 206. A slot 208 is formed with an opening on the lower side of the inner protrusion 206. A locking screw 209 is movably installed in the slot 208. The inner end of the locking screw 209 is threadedly connected to the frame plate 101.

[0031] Each pair of locking screws 209 is fitted with an inner pressure plate 211. An inner pressure spring 210 abuts against the outer side of the inner pressure plate 211. The outer end of the inner pressure spring 210 abuts against the inner end of the locking screw 209 cap. A right-angled trapezoidal locking block 212 is formed on the inner side of the inner pressure plate 211. The upper side of the locking block 212 is a slope, and the inner end of the slope extends downward. A right-angled trapezoidal locking block 207 is formed on the outer wall of the inner protrusion plate 206. The lower side of the locking block 207 is a slope, and the outer end of the slope extends upward.

[0032] like Figure 5As shown, the sealing mechanism 3 includes a pair of protrusions 108 welded to the outer side of the lower extension plate 105. A hinge screw 30 is threadedly connected to the protrusion 108. A rotating bar 31 is rotatably mounted on the rod of the hinge screw 30. A concave cover 37 is formed on the lower side of the rotating bar 31. The concave cover 37 is located below the feed port. A latch 32 is formed with an opening at the inner end of the rotating bar 31. A latch screw 36 passes through the latch 32. An inner bar 111 is welded to the outer side of the inclined bucket plate 109. A guide screw 33 is threadedly fixed on the inner bar 111. An inner top bar 35 is sleeved on the guide screw 33. The rod of the latch screw 36 is threadedly fixed to both ends of the inner top bar 35. A locking spring 34 is sleeved on the outer end of the latch screw 36. The inner end of the locking spring 34 abuts against the inner top bar 35. The outer end of the locking spring 34 abuts against the cap of the guide screw 33.

[0033] like Figure 6 and Figure 7 As shown, the rocking mechanism 4 includes a base 400, with sidewall plates 401 welded to opposite sides of the base 400. A pair of concave inner frames 410 are bolted to the base 400. A first shaft 409 is rotatably mounted on the upper end of the inner frame 410. The outer end of the first shaft 409 passes through the sidewall plate 401, and a gear 411 is fixed to the outer end of the first shaft 409. The gear 411 is located outside the sidewall plate 401. A driven bevel gear 408 is fixed to the inner end of the first shaft 409, and a driving bevel gear 407 meshes with the driven bevel gear 408. Multiple support rods 418 are fixed to the base 400, and an upper end plate 405 is fixed to the upper end of the support rods 418. A certain component is fixed on the upper end plate 405. The motor 406 has its output shaft fixed to the drive bevel gear 407. The driven bevel gear 408 is located on both sides of the drive bevel gear 407. The upper end of the inner frame 410 is rotatably provided with a second shaft 413, which is rotatably mounted on the side wall plate 401. The inner end of the second shaft 413 is fixed with a rotating horizontal plate 414, and a connecting seat 417 is formed on the rotating horizontal plate 414. The connecting seat 417 is fixed to the slag tray 104 by bolts. The outer end of the second shaft 413 is fixed with an incomplete gear 412, which is located on the outer side of the side wall plate 401. The incomplete gear 412 meshes with a gear 411 located on the same side, and there is an included angle between the incomplete gears 412. The base 400 includes a pair of concave seats 402 fixed by bolts, and multiple inner crossbars 404 welded between the concave seats 402. The vertical section of the concave seat 402 is provided with an arc-shaped groove 403. A roller 416 is movably provided in the arc-shaped groove 403. A third shaft 415 is rotatably provided in the roller 416. The third shaft 415 is fixed to the end of the rotating crossbar 414.

[0034] This invention is applied in the following manner: Step 1: Connect the opening / closing mechanism 2 and the sealing mechanism 3 to their respective locations. When the opening and closing mechanism 2 is connected: the operator inserts the inner plate (200) into the discharge port, and then the operator moves the two movable vertical plates 204 downward. During the movement, the inclined surface of the locking block 212 acts on the inclined surface of the locking block 207, thereby causing the inner pressure plate 211 to move outward. At the same time, the inner pressure spring 210 is compressed until the locking block 207 locks the position of the locking block 212. At this time, the locking screw 209 is inserted into the slot 208. Through the limiting of the locking block 207 and the locking block 212, the problem of the outer plate 201 disengaging during the swing is avoided.

[0035] When the sealing mechanism 3 is connected, the operator rotates the rotating bar 31 to block the lower end of the discharge port through the concave cover 37. Then, under the action of the locking spring 34, the locking screw 36 is locked in the slot 32, thereby achieving the purpose of sealing the discharge port.

[0036] Step 2: Pour the stir-fried aconite into the lower plate 100 through the rectangular hole. After pouring, the stir-fried aconite is located inside the frame plate 101 and below the cover plate 102. The lower extension frame 103 prevents the aconite from falling or moving out when it swings.

[0037] Step 3: Start the motor 406 so that it drives the drive bevel gear 407 to rotate. The rotation of the drive bevel gear 407 will cause it to rotate in opposite directions at the same speed. As the drive bevel gear 407 rotates, it will drive the two gears 411 to rotate in opposite directions. During the rotation of the gears 411, one of the gears 411 meshes with the incomplete gear 412, causing the storage section 1 to rotate in one direction. The other gear 411 and the incomplete gear 412 on the same side are disengaged. As the storage section 1 tilts, the aconite will gather at one end of the storage section 1. Subsequently, both gears 411 will disengage from the incomplete gear 412. The storage section 1 will then rotate under rotational inertia until one of the pairs of rollers 416 moves to... At the lower end of the arc-shaped groove 403, another gear 411 will mesh with the incomplete gear 412. Then, driven by the gear 411, the storage part 1 will tilt and rotate to the other end. This reciprocating swinging first can turn the aconite over, which is beneficial to the heat dissipation of the aconite at the bottom. During the swinging process, river sand and roasting residue will enter the slag tray 104 through the holes, and as the slag tray 104 tilts, it will enter the holding hopper through the slag discharge hole 106. In order to avoid the problem of river sand and other substances moving out of the holding hopper during the swinging process, an inclined plate 107 is used to block the river sand and roasting residue inside. Since the river sand is screened immediately after the aconite is roasted, it is to prevent the river sand from being embedded in the folds or holes of the aconite after the aconite cools down due to the shrinkage of the aconite volume, which would increase the difficulty of the later river sand separation.

[0038] Step 4: After the aconite has cooled down, the storage section 1 is tilted under the drive of the motor 406. Then, with the holding bag or container ready, the inner pressure plate 211 is pulled outward to release the limit on the movable vertical plate 204. The movable vertical plate 204 is then moved to disengage the locking screw 209 and the slot 208. The outer plate 201 is then removed, and the aconite inside is discharged.

[0039] Step 5: If it is necessary to discharge the residue and river sand, pull the locking screw 36 outward, then rotate the concave cover 37 downward, and then discharge the residue or river sand inside into the corresponding container.

[0040] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Obviously, those skilled in the art can make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention also intends to include these modifications and variations.

Claims

1. A device for cooling food after stir-frying, characterized in that, It includes a storage section (1), with opening and closing mechanisms (2) at both ends of the storage section (1), sealing mechanisms (3) at the lower sides of both ends of the storage section (1), and a swing mechanism (4) at the bottom of the storage section (1).

2. The device for cooling after stir-frying according to claim 1, characterized in that, The storage section (1) includes a lower plate (100) with a rectangular structure. The lower plate (100) has multiple holes. A frame plate (101) is fixed to the outer periphery of the lower plate (100). Discharge ports are opened at both ends of the frame plate (101). A cover plate (102) is welded to the upper side of the frame plate (101). A rectangular hole is opened on the cover plate (102). A slag collection tray (104) is welded to the lower side of the lower plate (100). Slag discharge holes (106) are opened at both ends of the slag collection tray (104). A lower extension plate (105) is attached, and an inclined bucket plate (109) is welded to the lower side of the slag tray (104). The lower end of the inclined bucket plate (109) is inclined to the lower extension plate (105), and there is a gap between the lower end of the inclined bucket plate (109) and the lower end of the lower extension plate (105). The two ends of the inclined bucket plate (109) are bent and welded to the lower extension plate (105). The inclined bucket plate (109), the side bucket plate (110) and the lower extension plate (105) form a container that encloses the slag discharge hole (106) and has a discharge port at the bottom.

3. The cooling device after stir-frying according to claim 2, characterized in that, The cover plate (102) is welded downward to a lower extension frame (103), which has a tapered structure and the size of the lower end of the lower extension frame (103) is smaller than the size of its upper end.

4. The cooling device after stir-frying according to claim 2, characterized in that, The two ends of the slag tray (104) are respectively welded with inclined plates (107). The outer end of the inclined plate (107) extends downward and is welded to the slag discharge hole (106).

5. The cooling device after stir-frying according to claim 2, characterized in that, The opening and closing mechanism (2) includes an inner plate (200) embedded in the discharge port. An outer plate (201) is welded to the outer end of the inner plate (200). The outer plate (201) is located outside the frame plate (101). The two ends of the outer plate (201) are bent with folding plates (202). A pair of limiting screws (203) are respectively connected to the folding plates (202). A movable vertical plate (204) is sleeved on the rod part of the limiting screw (203). A groove is opened on the movable vertical plate (204). For the strip hole (205), the rod part of the limiting screw (203) passes through the strip hole (205). The movable vertical plate (204) is located outside the folding plate (202). The two ends of the movable vertical plate (204) are respectively formed with inner convex plates (206). The lower side of the inner convex plate (206) is formed with a slot (208). The slot (208) is movably provided with a locking screw (209). The inner end of the locking screw (209) is connected to the frame plate (101).

6. The cooling device after stir-frying according to claim 5, characterized in that, Each pair of locking screws (209) is fitted with an inner pressure plate (211). An inner pressure spring (210) abuts against the outer side of the inner pressure plate (211). The outer end of the inner pressure spring (210) abuts against the inner end of the locking screw (209) cap. A right-angled trapezoidal locking block (212) is formed on the inner side of the inner pressure plate (211). The upper side of the locking block (212) is an inclined surface, and the inner end of the inclined surface extends downward. A right-angled trapezoidal locking block (207) is formed on the outer wall of the inner convex plate (206). The lower side of the locking block (207) is an inclined surface, and the outer end of the inclined surface extends upward.

7. The cooling device after stir-frying according to claim 2, characterized in that, The sealing mechanism (3) includes a pair of protrusions (108) welded to the outside of the lower extension plate (105). A hinge screw (30) is connected to the protrusion (108). A rotating bar (31) is rotatably provided on the rod of the hinge screw (30). A concave cover (37) is formed on the lower side of the rotating bar (31). The concave cover (37) is located below the feed port. A latch (32) is formed with an opening at the inner end of the rotating bar (31). A latch screw (36) is inserted into the latch (32). The inclined bucket plate (109) has an inner strip (111) welded on its outer side. A guide screw (33) is fixed on the inner strip (111). An inner top strip (35) is fitted on the guide screw (33). The rod part of the snap-fit ​​screw (36) is fixed to both ends of the inner top strip (35). A locking spring (34) is fitted on the outer end of the snap-fit ​​screw (36). The inner end of the locking spring (34) abuts against the inner top strip (35). The outer end of the locking spring (34) abuts against the cap of the guide screw (33).

8. The cooling device after stir-frying according to claim 2, characterized in that, The swing mechanism (4) includes a base (400), with sidewall plates (401) welded to opposite sides of the base (400). A pair of concave inner frames (410) are fixed to the base (400) by bolts. A first shaft (409) is rotatably provided at the upper end of the inner frame (410). The outer end of the first shaft (409) passes through the sidewall plate (401). A gear (411) is fixed at the outer end of the first shaft (409). The gear (411) is located outside the sidewall plate (401). A driven bevel gear (408) is fixed at the inner end of the first shaft (409). A driving bevel gear (407) meshes with the driven bevel gear (408). Multiple support rods (418) are fixed to the base (400). An upper end plate (405) is fixed to the upper end of the support rods (418). An electric motor is fixed to the upper end plate (405). The output shaft of the motor (406) is fixed on the drive bevel gear (407), and the driven bevel gear (408) is located on both sides of the drive bevel gear (407). The upper end of the inner frame (410) is rotatably provided with a second shaft (413). The second shaft (413) is rotatably provided on the side wall plate (401). The inner end of the second shaft (413) is fixed with a rotating horizontal plate (414). A connecting seat (417) is formed on the rotating horizontal plate (414). The connecting seat (417) is fixed to the slag tray (104) by bolts. The outer end of the second shaft (413) is fixed with an incomplete gear (412). The incomplete gear (412) is located on the outer side of the side wall plate (401). The incomplete gear (412) meshes with the gear (411) located on the same side, and there is an included angle between the incomplete gears (412).

9. The cooling device after stir-frying according to claim 8, characterized in that, The base (400) includes a pair of concave seats (402) fixed by bolts, and multiple inner crossbars (404) welded between the concave seats (402). The vertical section of the concave seat (402) is provided with an arc groove (403), and a roller (416) is movably provided in the arc groove (403). A third shaft (415) is rotatably provided in the roller (416), and the third shaft (415) is fixed to the end of the rotating crossbar (414).

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