Melting furnace for preparing yttrium aluminum garnet crystal

Abstract

The invention relates to the technical field of crystal manufacturing, in particular to a melting furnace for preparing yttrium aluminum garnet crystals, which comprises a supporting seat and a lifting heating assembly arranged at the top of the supporting seat, and the lifting heating assembly comprises a heating piece arranged at the top of the supporting seat and a lifting containing piece arranged in the heating piece. When materials need to be melted, the materials are placed in the lifting containing piece, the heating piece is started at the moment, and the heating piece drives the materials to ascend to a heating position through the lifting containing piece and heats and melts the materials. At the moment, the heating piece drives the materials to continuously rotate and intermittently shake up and down through the lifting material containing piece, so that accumulation of the materials in the middle of the lifting material containing piece is prevented, and meanwhile, the heating piece drives the reciprocating slag salvaging assembly to automatically salvage the dross at the upper ends of the materials.

Description

Technical Field

[0001] The invention relates to the technical field of crystal manufacturing, in particular to a melting furnace for preparing yttrium aluminum garnet crystals. Background Art

[0002] Yttrium aluminum garnet crystal is a synthetic cubic crystal that is often used in fields such as lasers and optics. Yttrium aluminum garnet crystal is often prepared by the pulling method. The raw materials need to be heated and melted in a melting furnace before the crystal is generated.

[0003] During use, in the prior art, when melting materials, materials close to the inner wall of the crucible melt faster than materials far from the inner wall of the crucible, which may cause accumulation of materials in the middle of the crucible, resulting in low melting efficiency of the materials.

[0004] Based on this, the present invention designs a melting furnace for preparing yttrium aluminum garnet crystals to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned problem or the problem in the prior art that material accumulates in the middle of the crucible and causes slow melting, the present invention is proposed.

[0006] Therefore, an object of the present invention is to provide a melting furnace for preparing yttrium aluminum garnet crystals.

[0007] As a preferred embodiment of the present invention, the melting furnace for preparing yttrium aluminum garnet crystals includes: a support base;

[0008] A lifting heating component is provided on the top of the support base, comprising a heating element provided on the top of the support base and a lifting material holding element provided inside the heating element;

[0009] The heating element comprises a shell arranged on the top of the support base, a rotating rod arranged inside the shell, and a heating wire arranged inside the shell;

[0010] The lifting material holding member includes a lifting plate arranged inside the shell, a crucible arranged on the top of the lifting plate, a first limiting slider arranged on the side wall of the lifting plate, an inclined chute opened on the inner wall of the shell, an annular chute opened at the end of the inclined chute, and a drop slope opened at the end of the inclined chute;

[0011] The lifting plate and the crucible rotate and rise to a certain height, then rotate at a fixed height and shake up and down intermittently.

[0012] As a preferred embodiment of the melting furnace for preparing yttrium aluminum garnet crystals according to the present invention, the heating element further comprises a rotating rod, which is arranged inside the outer shell, an insert block is provided at the end of the rotating rod, a rotating block is provided at the end of the insert block, and a first motor is provided at the end of the rotating block.

[0013] As a preferred solution of the melting furnace for preparing yttrium aluminum garnet crystals of the present invention, the lifting and holding member also includes a slide, the interior of the crucible is provided with a slide, the end of the inclined slide is provided with a vertical slide, and the middle part of the rotating rod is arranged in the slide.

[0014] As a preferred solution of the melting furnace for preparing yttrium aluminum garnet crystals of the present invention, the rotating rod is a square rod, and the insert is a square insert.

[0015] As a preferred solution of the melting furnace for preparing yttrium aluminum garnet crystals of the present invention, a reciprocating slag scooping assembly is provided at the end of the rotating rod.

[0016] As a preferred embodiment of the melting furnace for preparing yttrium aluminum garnet crystals according to the present invention, the reciprocating slag scooping assembly includes a reciprocating member, a reciprocating member is provided at the end of the rotating rod, a slag scooping member is provided on the outer wall of the reciprocating member, and the end of the slag scooping member is provided on the support seat.

[0017] As a preferred solution of the melting furnace for preparing yttrium aluminum garnet crystals of the present invention, the reciprocating part includes a rotating column, a rotating column is provided at the end of the rotating rod, a second limiting slider is provided on the outer wall of the rotating column, a lifting slide is provided on the outside of the rotating column, and a cam groove is provided on the inner wall of the lifting slide.

[0018] As a preferred solution of the melting furnace for preparing yttrium aluminum garnet crystals of the present invention, the slag scooping part includes a slag scooping screen, a slag scooping screen is provided on the outer wall of the lifting slide, a first limiting slide is provided at the end of the slag scooping screen, and the end of the first limiting slide is provided on the support seat.

[0019] As a preferred solution of the melting furnace for preparing yttrium aluminum garnet crystals of the present invention, a discharge lifting assembly is provided on the outside of the shell.

[0020] As a preferred solution of the melting furnace for preparing yttrium aluminum garnet crystals according to the present invention, the discharge lifting assembly includes a support frame, a support frame is provided on the top of the support seat, a threaded rod is provided inside the support frame, a second motor is provided at the end of the threaded rod, a lifting frame is provided in the middle of the second motor, the end of the lifting frame is provided on the support frame, the end of the lifting frame is provided on the outer shell, and a second limiting slide is provided inside the support frame.

[0021] The beneficial effects of the melting furnace for preparing yttrium aluminum garnet crystals of the present invention are as follows: when the material needs to be melted, the material is placed in a lifting container, and the heating element is started at this time. The heating element drives the material to rise to a heating position through the lifting container and heats and melts the material. At this time, the heating element drives the material to rotate continuously and intermittently shake up and down through the lifting container, thereby preventing the accumulation of material in the middle of the lifting container. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 The figure is a schematic diagram of the overall structure of a melting furnace for preparing yttrium aluminum garnet crystals according to the present invention.

[0024] Figure 2 The figure is a schematic diagram of the reciprocating structure of a melting furnace for preparing yttrium aluminum garnet crystals according to the present invention.

[0025] Figure 3 The present invention is a schematic diagram of an insert structure of a melting furnace for preparing yttrium aluminum garnet crystals.

[0026] Figure 4 The present invention is a schematic diagram of a vertical chute structure of a melting furnace for preparing yttrium aluminum garnet crystals.

[0027] Figure 5 The present invention is a schematic diagram of the slope structure of a melting furnace for preparing yttrium aluminum garnet crystals.

[0028] Figure 6 The figure is a schematic structural diagram of a first limiting slider of a melting furnace for preparing yttrium aluminum garnet crystals according to the present invention.

[0029] Figure 7 The present invention is a schematic diagram of a slag screen structure of a melting furnace for preparing yttrium aluminum garnet crystals.

[0030] The numbers in the figure represent: 1, support base; 2, lifting heating component; 21, heating element; 211, shell; 212, heating wire; 213, rotating rod; 214, rotating block; 215, insert block; 216, first motor; 22, lifting material holding member; 221, lifting plate; 222, crucible; 223, slide; 224, inclined slide; 225, vertical slide; 226, annular slide; 227, drop Slope; 228, first limit slider; 3, reciprocating slag scooping assembly; 31, reciprocating member; 311, rotating column; 312, second limit slider; 313, lifting slide; 314, cam groove; 32, slag scooping member; 321, slag scooping screen; 322, first limit slider; 4, discharge lifting assembly; 41, support frame; 42, second motor; 43, lifting frame; 44, threaded rod; 45, second limit slider. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0032] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive of other embodiments.

[0034] Example 1, reference Figures 1 to 6 , which is the first embodiment of the present invention, provides a melting furnace for preparing yttrium aluminum garnet crystals, which can achieve the effect of automatically shaking off materials, and includes a support base 1;

[0035] Specifically, the lifting heating assembly 2 disposed on the top of the support base 1 includes a heating element 21 disposed on the top of the support base 1 and a lifting material holding element 22 disposed inside the heating element 21; wherein,

[0036] The heating element 21 includes a housing 211 disposed on the top of the support base 1, a rotating rod 213 disposed inside the housing 211, and a heating wire 212 disposed inside the housing 211; and

[0037] The lifting material holding member 22 includes a lifting plate 221 disposed inside the housing 211, a crucible 222 disposed on the top of the lifting plate 221, a first limiting slider 228 disposed on the side wall of the lifting plate 221, an inclined chute 224 opened on the inner wall of the housing 211, an annular chute 226 opened at the end of the inclined chute 224, and a drop slope 227 opened at the end of the inclined chute 224; wherein,

[0038] The lifting plate 221 and the crucible 222 rotate and rise to a certain height, then rotate at a fixed height and intermittently shake up and down;

[0039] Furthermore, a lifting heating component 2 is connected to the top of the support base 1;

[0040] A groove is provided on the top of the support base 1;

[0041] The lifting and heating assembly 2 includes a heating element 21, the lower end of the heating element 21 is connected to the top of the support base 1, and the interior of the heating element 21 is connected to a lifting material holding element 22;

[0042] The heating element 21 includes a shell 211. The lower end of the shell 211 is inserted into the groove on the top of the support base 1. The upper end of the inner wall of the shell 211 is fixedly connected to the heating wire 212.

[0043] Several sets of positioning plates are fixedly connected to the lower end of the outer wall of the housing 211. Positioning posts are fixedly connected to the top of the support base 1 below the positioning plates. The positioning posts on the top of the support base 1 pass through the positioning plates on the outer wall of the housing 211 and are plugged into the positioning plates.

[0044] The lifting material holding member 22 includes a lifting plate 221, the lifting plate 221 is slidably connected to the inner wall of the shell 211, a crucible 222 is clamped on the top of the lifting plate 221, and a first limiting slider 228 is fixedly connected to the outer wall of the crucible 222. An inclined groove 224 is provided on the inner wall of the shell 211 below the heating wire 212, and an annular groove 226 is provided on the inner wall of the shell 211 above the inclined groove 224. The inclined groove 224 is connected to the annular groove 226, and a drop slope 227 is provided at the connection between the inclined groove 224 and the annular groove 226.

[0045] The falling slope 227 is a vertical slope;

[0046] Specifically, the heating element 21 further includes a rotating rod 213 , which is disposed inside the housing 211 . An insert block 215 is disposed at the end of the rotating rod 213 , a rotating block 214 is disposed at the end of the insert block 215 , and a first motor 216 is disposed at the end of the rotating block 214 .

[0047] The rotating rod 213 is a square rod, and the insert 215 is a square insert;

[0048] Furthermore, the heating element 21 further includes a rotating rod 213, the upper end of which is rotatably connected to the middle position of the inner top of the housing 211, the lower end of the rotating rod 213 is plugged with an insert block 215, the lower end of the insert block 215 is rotatably connected to the top of the support base 1, a first motor 216 is fixedly connected to the inner top of the support base 1 below the insert block 215, the output end of the first motor 216 passes through the top plate of the support base 1 and is fixedly connected to the rotating block 214, the rotating rod 213 passes through the lifting plate 221 and the crucible 222 and is limitedly slidably connected to both the lifting plate 221 and the crucible 222;

[0049] Specifically, the lifting material holding member 22 further includes a slide 223 . The slide 223 is disposed inside the crucible 222 . A vertical slide 225 is provided at the end of the inclined slide 224 . The middle portion of the rotating rod 213 is disposed inside the slide 223 .

[0050] Furthermore, the lifting member 22 further includes a slide 223, which is fixedly connected to the inner bottom of the crucible 222. The rotating rod 213 passes through the slide 223 and is slidably connected to the slide 223. A vertical slide 225 is provided on the inner wall of the housing 211 at the lower end of the inclined slide 224. The vertical slide 225 extends all the way to the bottom of the housing 211.

[0051] During use, when the material in the crucible 222 needs to be melted, the first motor 216 is started, the first motor 216 drives the rotating block 214 to rotate, the rotating block 214 drives the rotating rod 213 to rotate through the insert block 215, the rotating rod 213 drives the lifting plate 221, the crucible 222 and the slide 223 to rotate, the lifting plate 221 drives the first limiting slider 228 to slide in the inclined chute 224, at this time, under the limit of the inclined chute 224, the first limiting slider 228 drives the crucible 222 and the material to move upward through the lifting plate 221, when the first limiting slider 228 moves to the annular chute When the crucible 222 moves into the interior of the heating wire 212, the first limiting slider 228 slides in the annular chute 226, so that the lifting plate 221 drives the crucible 222 to rotate. At this time, the crucible 222 and the material are heated by the heating wire 212, thereby achieving melting of the material. Moreover, since the crucible 222 rotates continuously, the material is heated evenly. Moreover, when the first limiting slider 228 slides in the annular chute 226 and the inclined chute 224, the movement trajectory of the first limiting slider 228 is restricted, thereby achieving locking of the housing 211.

[0052] When the first limiting slider 228 slides to the slope 227 in the annular chute 226, the first limiting slider 228 suddenly drops into the inclined chute 224 under the action of gravity, so that the lifting plate 221 and the crucible 222 suddenly drop a short distance. At this time, the material inside the crucible 222 will vibrate and disperse under the action of inertia and gravity, thereby preventing the accumulation of material in the middle of the crucible 222 due to the melting of the material near the inner wall of the crucible 222 first, thereby greatly improving the melting efficiency of the material, thereby reducing energy consumption and improving work efficiency.

[0053] Example 2, reference Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 and Figure 7 , which is the second embodiment of the present invention, is different from the previous embodiment in that it includes a reciprocating slag scooping component 3,

[0054] Specifically, a reciprocating slag scooping assembly 3 is provided at the end of the rotating rod 213;

[0055] The reciprocating slag scooping assembly 3 includes a reciprocating member 31. The reciprocating member 31 is provided at the end of the rotating rod 213. A slag scooping member 32 is provided on the outer wall of the reciprocating member 31. The end of the slag scooping member 32 is provided on the support seat 1.

[0056] Furthermore, the upper end of the rotating rod 213 is connected to a reciprocating slag scooping assembly 3;

[0057] The reciprocating slag scooping assembly 3 includes a reciprocating member 31. The reciprocating member 31 is connected to the outer wall of the upper end of the rotating rod 213. The outer wall of the reciprocating member 31 is connected to a plurality of groups of slag scooping members 32. The upper ends of the slag scooping members 32 are all connected to the top plate of the support base 1.

[0058] Specifically, the reciprocating member 31 includes a rotating column 311. The rotating column 311 is provided at the end of the rotating rod 213. A second limiting slider 312 is provided on the outer wall of the rotating column 311. A lifting slide 313 is provided on the outside of the rotating column 311. A cam groove 314 is provided on the inner wall of the lifting slide 313.

[0059] Furthermore, the reciprocating member 31 includes a rotating column 311. The rotating column 311 is fixedly connected to the outer wall of the upper end of the rotating rod 213. The second limiting slider 312 is fixedly connected to the outer wall of the rotating column 311. The lifting slide 313 is slidably connected to the outer wall of the rotating column 311. The lifting slide 313 has a cam groove 314 formed on the inner wall of the lifting slide 313. The end of the second limiting slider 312 closest to the lifting slide 313 is slidably connected to the cam groove 314.

[0060] Specifically, the slag scooping member 32 includes a slag scooping screen 321. The slag scooping screen 321 is provided on the outer wall of the lifting slide 313. The end of the slag scooping screen 321 is provided with a first limiting slide post 322. The end of the first limiting slide post 322 is provided on the support seat 1.

[0061] Furthermore, the slag scooping member 32 includes a slag scooping screen 321. A plurality of slag scooping screens 321 are fixedly connected to the outer wall of the lifting slide 313 at equal intervals. The top of the slag scooping screen 321 is fixedly connected to a first limiting slide 322. The top of the first limiting slide 322 passes through the top plate of the support base 1 and is slidably connected to the support base 1.

[0062] When the second limiting slider 312 moves to the bottom of the cam slot 314, the lower end of the slag sieve 321 is located inside the crucible 222. When the second limiting slider 312 moves to the top of the cam slot 314, the lower end of the slag sieve 321 is located above the crucible 222.

[0063] When in use, when the rotating rod 213 drives the crucible 222 to rotate to melt the material, the rotating rod 213 also drives the rotating column 311 to rotate, and the rotating column 311 drives the second limiting slider 312 to slide in the cam groove 314. At this time, under the limit of the cam groove 314, the second limiting slider 312 drives the lifting slide 313 to reciprocate up and down, and the lifting slide 313 drives the slag sieve 321 to reciprocate up and down under the limit guide of the first limiting slider 322, so that the slag sieve 321 keeps moving up and down and scoops the slag above the crucible 222, thereby realizing automatic scooping of the slag without manual scooping.

[0064] Example 2, reference Figures 1 to 3 , which is the second embodiment of the present invention, is different from the previous embodiment in that it includes a discharge lifting component 4,

[0065] Specifically, a discharge lifting assembly 4 is provided on the outside of the housing 211;

[0066] The discharge lifting assembly 4 includes a support frame 41. The support frame 41 is provided on the top of the support base 1. A threaded rod 44 is provided inside the support frame 41. A second motor 42 is provided at the end of the threaded rod 44. A lifting frame 43 is provided in the middle of the second motor 42. The end of the lifting frame 43 is provided on the support frame 41. The end of the lifting frame 43 is provided on the housing 211. A second limiting slide 45 is provided inside the support frame 41.

[0067] Furthermore, a discharge lifting assembly 4 is connected to the outer wall of the housing 211;

[0068] The discharging lifting assembly 4 includes a support frame 41, which is fixedly connected to the top of the support base 1 outside the shell 211, and a threaded rod 44 is rotatably connected to the inner top of the support frame 41. A lifting frame 43 is fixedly connected to the outer wall of the shell 211, and one end of the lifting frame 43 close to the support frame 41 is slidably connected to the support frame 41. The lower end of the threaded rod 44 passes through the lifting frame 43 and is threadedly connected to the lifting frame 43. A second motor 42 is fixedly connected to the inner top of the support base 1 below the lifting frame 43, and the output end of the second motor 42 passes through the top plate of the support base 1 and is fixedly connected to the lower end of the threaded rod 44. A second limiting slide 45 is fixedly connected to the inner top of the support frame 41, and the second limiting slide 45 passes through the lifting frame 43 and is slidably connected to the lifting frame 43. The lower end of the second limiting slide 45 is fixedly connected to the top of the support base 1;

[0069] When the lifting plate 221 is in use, the first limiting slider 228 is driven by the lifting plate 221 to rotate until it passes the slope 227. Under the action of gravity, the lifting plate 221 drives the first limiting slider 228 to fall into the inclined slot 224. Since the lifting plate 221 is rotated in the opposite direction at this time, the first limiting slider 228 continues to slide in the inclined slot 224 and will not slide out of the inclined slot 224. As a result, under the limitation of the inclined slot 224, the first limiting slider 228 drives the lifting plate 221 and the crucible 222 to move downward. When the lifting plate 221 moves to contact the support seat 1, the first limiting slider 228 moves to the connection between the inclined slot 224 and the vertical slot 225, and the shell 211 is unlocked at this time.

[0070] The second motor 42 is started, and the second motor 42 drives the lifting frame 43 to move upward under the limiting guide of the second limiting slide 45 through the threaded rod 44. The lifting frame 43 drives the shell 211 to move upward. At this time, the shell 211 drives the vertical slide 225 to move upward. At this time, the first limiting slide 228 slides along the vertical slide 225 and disengages from the vertical slide 225. While the shell 211 moves upward, it drives the rotating rod 213 to move upward. The rotating rod 213 moves upward and disengages from the insert 215. When the shell 211 moves to the highest point, the crucible 222 is completely located outside the shell 211. At this time, the crucible 222 can be removed, thereby realizing automatic unlocking of the shell 211 and convenient removal of the crucible 222.

[0071] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A melting furnace for preparing yttrium aluminum garnet crystals, characterized in that: Including, a support seat (1); and The lifting heating assembly (2) arranged on the top of the support seat (1) comprises a heating element (21) arranged on the top of the support seat (1) and a lifting material holding element (22) arranged inside the heating element (21); wherein, The heating element (21) comprises a shell (211) disposed on the top of the support seat (1), a rotating rod (213) disposed inside the shell (211), and a heating wire (212) disposed inside the shell (211); and The lifting material holding member (22) includes a lifting plate (221) arranged inside the shell (211), a crucible (222) arranged on the top of the lifting plate (221), a first limiting slider (228) arranged on the side wall of the lifting plate (221), an inclined chute (224) opened on the inner wall of the shell (211), an annular chute (226) opened at the end of the inclined chute (224), and a drop slope (227) opened at the end of the inclined chute (224); wherein, The lifting plate (221) and the crucible (222) rotate and rise to a certain height, then rotate at a fixed height and intermittently shake up and down.

2. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 1, characterized in that: The heating element (21) further comprises a rotating rod (213), the rotating rod (213) being arranged inside the housing (211), an insert block (215) being arranged at the end of the rotating rod (213), a rotating block (214) being arranged at the end of the insert block (215), and a first motor (216) being arranged at the end of the rotating block (214).

3. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 2, characterized in that: The lifting material holding member (22) further includes a slide (223), the slide (223) is arranged inside the crucible (222), a vertical slide (225) is opened at the end of the inclined slide (224), and the middle part of the rotating rod (213) is arranged in the slide (223).

4. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 3, characterized in that: The rotating rod (213) is a square rod, and the insert block (215) is a square insert block.

5. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 4, characterized in that: A reciprocating slag scooping assembly (3) is provided at the end of the rotating rod (213).

6. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 5, characterized in that: The reciprocating slag scooping assembly (3) comprises a reciprocating member (31), the end of the rotating rod (213) is provided with the reciprocating member (31), the outer wall of the reciprocating member (31) is provided with a slag scooping member (32), and the end of the slag scooping member (32) is provided on the support seat (1).

7. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 6, characterized in that: The reciprocating member (31) includes a rotating column (311), the rotating column (311) is provided at the end of the rotating rod (213), a second limiting slider (312) is provided on the outer wall of the rotating column (311), a lifting slide (313) is provided outside the rotating column (311), and a cam groove (314) is provided on the inner wall of the lifting slide (313).

8. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 7, characterized in that: The slag scooping member (32) comprises a slag scooping screen (321), the slag scooping screen (321) is provided on the outer wall of the lifting slide (313), a first limiting slide column (322) is provided at the end of the slag scooping screen (321), and the end of the first limiting slide column (322) is provided on the support seat (1).

9. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 8, characterized in that: A discharge lifting assembly (4) is provided outside the housing (211).

10. The melting furnace for preparing yttrium aluminum garnet crystals according to claim 9, characterized in that: The discharge lifting assembly (4) includes a support frame (41), the support frame (41) is provided on the top of the support seat (1), a threaded rod (44) is provided inside the support frame (41), a second motor (42) is provided at the end of the threaded rod (44), a lifting frame (43) is provided in the middle of the second motor (42), the end of the lifting frame (43) is provided on the support frame (41), the end of the lifting frame (43) is provided on the housing (211), and a second limiting sliding column (45) is provided inside the support frame (41).

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