Pliers for clamping square crucible

Abstract

The invention relates to a crucible clamping tool, in particular to a pair of pliers for clamping a square crucible, which comprises a frame provided with a heat insulation cavity; the clamping head can move relative to the frame, and the clamping head at least comprises two clamping plates; an operation part which is installed on the frame and can drive the clamping head; when the operation part does the first motion, the clamping head can enter the heat insulation cavity, when the operation part does the second motion, the clamping head can be separated from the heat insulation cavity, and the two clamping plates in the clamping head move horizontally to be close to each other. During clamping, the two clamping plates translate from the two sides to the crucible, so that the clamping plates can obtain a larger contact area with the crucible relative to the sharp mouth ends which rotate in the prior art, the crucible can be clamped more stably, after calcination is completed, the operation part is controlled to do first motion, at the moment, the clamping head can return to the interior of the heat insulation cavity, and the heat insulation effect of the crucible is improved. Therefore, the two high-temperature clamping plates are prevented from being scalded due to the fact that operators touch the clamping plates by mistake.

Description

Technical Field

[0001] The present invention relates to a crucible clamping tool, in particular to a pair of pliers for clamping a square crucible. Background Art

[0002] Crucible pliers are a tool for clamping a crucible. When the crucible is in use, the item to be calcined is placed inside the crucible. In order for the operator to place the crucible on the flame for calcination, the operator needs to use the crucible pliers to clamp the crucible to avoid scalding problems.

[0003] However, when the tip of the existing crucible pliers clamps a square crucible, since the tip makes a rotational motion, it is difficult for the tip to have a large contact area with the crucible. Moreover, after calcination, the temperature of the tip is very high, and being directly exposed easily causes accidental contact scalding problems. Summary of the Invention

[0004] Therefore, the technical problems to be solved by the present invention are: unstable clamping and accidental contact scalding problems.

[0005] The above technical problems are solved by the following technical solutions: The present invention provides a pair of pliers for clamping a square crucible, including a frame provided with a heat insulation cavity; a clamping head capable of moving relative to the frame, the clamping head including at least two clamping plates; an operating part mounted on the frame and capable of driving the clamping head; when the operating part makes a first movement, the clamping head can enter the interior of the heat insulation cavity, and when the operating part makes a second movement, the clamping head can disengage from the heat insulation cavity, and the two clamping plates in the clamping head move closer in parallel.

[0006] In a preferred embodiment of the pair of pliers for clamping a square crucible according to the present invention: a guiding structure is provided on the frame, and the pair of pliers for clamping a square crucible further includes a sliding part slidably connected to the guiding structure, and the clamping head is mounted on the sliding part.

[0007] In a preferred embodiment of the pair of pliers for clamping a square crucible according to the present invention: the operating part includes a first rod and a second rod rotatably connected by a shaft, and both the first rod and the second rod are provided with working ends; the space between the working ends of the first rod and the second rod is a mating gap; The sliding part includes a seat body slidably connected to the guiding structure and a force-receiving body connected to the seat body, and the force-receiving body is located in the mating gap; The second movement of the operating part is that the working ends of the first rod and the second rod rotate towards each other to narrow the mating gap, and the first movement of the operating part is that the working ends of the first rod and the second rod rotate away from each other to increase the mating gap.

[0008] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention: the clamping head includes a crossbar connected to the sliding part, and the clamping plate is slidably mounted on the crossbar.

[0009] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention: a first elastic member is further mounted on the guiding structure, and the first elastic member abuts against the sliding part.

[0010] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention: the frame at least includes a first base body and a second base body, and an accommodation space is formed inside the first base body to constitute a heat insulation cavity.

[0011] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention: the clamping head includes a mounting seat slidably mounted on the first base body, and the clamping plate is slidably mounted on the mounting seat.

[0012] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention: a connecting part is further included; the connecting part includes, a connecting pipe, which is connected to the mounting seat; a sliding member, which is slidably sleeved on the outer wall of the radial direction of the connecting pipe; a connecting rod, which connects the sliding member and the clamping plate; a second elastic member, which abuts against the sliding member; a constraining member, which is slidably mounted on the connecting pipe and is used to constrain the position of the sliding member; The operating part can directly push the connecting pipe, and the operating part can also move relative to the connecting pipe to adjust the position of the constraining member.

[0013] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention: the operating part includes a limiting column, the limiting column is threadedly connected to the connecting pipe, and the limiting column is buckled with the constraining member.

[0014] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention: a positioning part is further included, the positioning part includes a third elastic member, and a clamping pin abutted against the third elastic member; The operating part further includes a positioning body connected to the limiting column, a push-pull built-in body capable of moving is arranged inside the positioning body, and the push-pull built-in body is connected with an operating column; A clamping groove is formed on the positioning body, and when the clamping pin extends into the inside of the clamping groove, the positioning body can be locked.

[0015] The beneficial effects of the present invention are as follows: By controlling the operating part to perform the second movement, at this time, the clamping head can extend from the inside of the heat insulation cavity to clamp the crucible to be clamped. When clamping, the two clamping plates translate from both sides towards the crucible, so that the clamping plates can obtain a larger contact area with the crucible compared to the pointed nozzle end that rotates in the prior art, thereby being able to clamp the crucible more stably. After the calcination is completed, control the operating part to perform the first movement, at this time, the clamping head can return to the inside of the heat insulation cavity, so that the two high-temperature clamping plates will not be accidentally touched by the operator to cause scalding problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below only relate to some embodiments of the present invention and do not limit the present invention. Among them: Figure 1 Shows the overall structural schematic diagram of the first embodiment; Figure 2 Shows the front view of the overall structure of the first embodiment; Figure 3 Shows the partial structural diagram of the first embodiment; Figure 4 Shows the first state diagram of the operating part and the sliding part of the first embodiment; Figure 5 Shows the second state diagram of the operating part and the sliding part of the first embodiment; Figure 6 Shows the overall structural schematic diagram of the second embodiment; Figure 7 Shows the overall internal structural schematic diagram of the second embodiment; Figure 8 Shows the structural schematic diagram of the connecting part of the second embodiment; Figure 9 Shows the partial structural schematic diagram of the second embodiment; Figure 10 Shows the structural schematic diagram of the positioning part of the second embodiment.

[0017] 100. Frame; 101. Heat insulation cavity; 102. Guide structure; 103. First elastic member; 104. First base body; 105. Second base body; 106. Plate-shaped structure; 107. Side frame; 108. Mounting column; 200. Clamping head; 201. Clamping plate; 202. Cross arm; 203. Mounting seat; 300. Operating part; 301. First rod member; 302. Second rod member; 303. Clearance fit; 304. Positioning body; 305. Card slot; 306. Push-pull built-in body; 307. Operating column; 308. Taking end; 309. Working end; 310. Buckling body; 311. Limit column; 312. Threaded section; 400. Sliding part; 401. Seat body; 402. Force-bearing body; 500. Connecting part; 501. Connecting pipe; 502. Sliding member; 503. Link rod; 504. Second elastic member; 505. Constraint member; 600. Positioning part; 601. Third elastic member; 602. Pin; 700. First protrusion; 800. Second protrusion. Detailed implementation manners

[0018] In order to enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below in conjunction with the detailed implementation manners and the accompanying drawings.

[0019] The terms used in the present invention are those general terms that are currently widely used in the art in consideration of the functions of the present invention. However, these terms may change according to the intentions of those of ordinary skill in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present invention. Therefore, the terms used in the specification should not be understood as simple names, but based on the meanings of the terms and the overall description of the present invention.

[0020] Referring to Figure 1 and Figure 2 , this embodiment provides a pair of pliers for clamping a square crucible, including a frame 100. The frame 100 is provided with a heat insulation cavity 101. The device further includes a clamping head 200. The clamping head 200 can move relative to the frame 100. The clamping head 200 includes at least two clamping plates 201. When using the clamping head 200 to clamp and calcine the crucible, the clamping head 200 can extend out from the inside of the heat insulation cavity 101 for clamping the crucible. After the calcination is completed, the clamping head 200 can move back into the inside of the heat insulation cavity 101, thereby avoiding the problem of accidental contact and scalding.

[0021] The device includes an operating part 300. The operating part 300 is installed on the frame 100 and can drive the clamping head 200. When the operating part 300 makes a first movement, the clamping head 200 can enter the inside of the heat insulation cavity 101. When the operating part 300 makes a second movement, the clamping head 200 can disengage from the heat insulation cavity 101, and the two clamping plates 201 in the clamping head 200 move closer in parallel.

[0022] Therefore, when in use, the operator controls the operating part 300 to make the second movement, and the clamping head 200 can extend from the inside of the insulation chamber 101 to clamp the crucible that needs to be clamped. When clamping, the two clamping plates 201 translate from both sides toward the crucible, so that the clamping plates 201 can obtain a larger contact area with the crucible relative to the pointed end that rotates in the prior art, so that the crucible can be clamped more stably. After calcination is completed, the operating part 300 is controlled to make the first movement, and the clamping head 200 can return to the inside of the insulation chamber 101, so that the two high-temperature clamping plates 201 will not be accidentally touched by the operator to cause burns.

[0023] Reference Figures 1 to 4 In the first embodiment provided in the present application, a guide structure 102 is provided on the frame 100, and the pliers for clamping the square crucible also include a sliding portion 400 slidably connected to the guide structure 102, and the clamping head 200 is installed on the sliding portion 400. In this embodiment, the frame 100 includes two plate-shaped structures 106, and the guide structures 102 are installed on the two plate-shaped structures 106. The guide structure 102 is a column, and the sliding portion 400 can move under the limit of the two guide structures 102, so that the clamping head 200 can move relative to the frame 100. When moving in the first direction, the first direction Figure 4 The clamping head 200 is marked as X in the middle, and can be separated from the heat insulation cavity 101. When moving in the second direction, the second direction Figure 4 Marked as Y in the middle, the clamping head 200 can enter the insulation cavity 101.

[0024] Please refer to Figure 1 In this embodiment, two groups of side frames 107 are provided on the frame 100, and the number of side frames 107 in each group is two. A gap is left between the two side frames 107 in the same group, and this gap constitutes the heat insulation cavity 101. The splint 201 can enter the gap between the two side frames 107, thereby avoiding the problem of burns caused by accidental touch.

[0025] Please refer to Figure 3 The operating part 300 includes a first rod 301 and a second rod 302 connected by an axis, and a matching gap 303 is provided between the first rod 301 and the second rod 302; the first rod 301 and the second rod 302 both have a taking end 308 and a working end 309, wherein the taking end 308 is used for the operator to take the device, and the gap between the two working ends 309 is the matching gap 303, Figure 3The mating clearance 303 is indicated by a dashed line in the figure, but the mating clearance 303 is not limited to the position of the dashed line. The triangular area between the working ends 309 of the first rod 301 and the second rod 302 is the mating clearance 303. When the working ends 309 of the two approach each other by rotation, the mating clearance 303 decreases. When the working ends 309 of the two rotate away from each other, the mating clearance 303 increases.

[0026] Please refer to Figures 3 to 5 , the sliding part 400 includes a seat body 401 slidably connected to the guiding structure 102 and a force-bearing body 402 connected to the seat body 401. The force-bearing body 402 is located within the mating clearance 303. A through hole is provided in the seat body 401, and the two guiding structures 102 penetrate through the seat body 401 through the through hole. The force-bearing body 402 is directly fixed on the seat body 401. The force-bearing body 402 is in contact with the first rod 301 and the working end 309 of the second rod 302. When the operating part 300 makes a second movement, the first rod 301 and the second rod 302 rotate to reduce the mating clearance 303. When the operating part 300 makes a first movement, the first rod 301 and the second rod 302 rotate to increase the mating clearance 303. As Figure 5 shown, when the mating clearance 303 is reduced, the working ends 309 of the first rod 301 and the second rod 302 can squeeze the force-bearing body 402, causing the force-bearing body 402 to move in the first direction. In this embodiment, the clamping head 200 is directly mounted on the force-bearing body 402. Therefore, when the force-bearing body 402 moves in the first direction, it can drive the clamping head 200 to move in the first direction away from the heat insulation cavity 101.

[0027] A first elastic member 103 is further mounted on the guiding structure 102. The first elastic member 103 abuts against the sliding part 400, and the first elastic member 103 applies a thrust force in the second direction to the sliding part 400. When the mating clearance 303 is reduced, the force-bearing body 402 and the seat body 401 move in the first direction, pressing the first elastic member 103 and causing the first elastic member 103 to be compressed. Therefore, as Figure 4 shown, when the first rod 301 and the second rod 302 rotate to increase the mating clearance 303, the force-bearing body 402 and the seat body 401 obtain space to move in the second direction. At this time, the elastic force of the first elastic member 103 can push the seat body 401 and the force-bearing body 402 to move in the second direction, thereby driving the clamping head 200 to return to the inside of the heat insulation cavity 101 in the second direction. Among them, the first elastic member 103 can be selected as a spring, and other elastic members in this application can also be selected as springs.

[0028] Continue to refer to Figure 3 and Figure 4, the clamping head 200 includes a crossbar 202 connected to the sliding part 400. The clamping plate 201 is slidably mounted on the crossbar 202. When the crossbar 202 is connected to the sliding part 400, the crossbar 202 is directly mounted on the force-bearing body 402. The clamping plate 201 can be slidably mounted in the crossbar 202 in many ways. For example, a sliding groove is opened on the crossbar 202, and the clamping plate 201 is mounted on the sliding groove through a slider structure, so as to be slidably mounted on the crossbar 202. When the two clamping plates 201 approach each other, they can clamp the crucible. When the two clamping plates 201 move away from each other, they can put down the crucible.

[0029] Therefore, more preferably, a spring-like structure is arranged inside the sliding groove. When the two clamping plates 201 approach each other, the spring-like structure will be pressed. After the thrust received by the two clamping plates 201 disappears, the two clamping plates 201 will move away from each other under the push of the spring-like structure to put down the crucible.

[0030] In this embodiment, the clamping plate 201 is pushed by the working ends 309 of the first rod 301 and the second rod 302. When the working ends 309 of the first rod 301 and the second rod 302 rotate in the direction of approaching each other, the two working ends 309 can respectively contact the two clamping plates 201 and push the two clamping plates 201 to translate in the direction of approaching each other, so that the gap between the two clamping plates 201 is reduced and the crucible can be clamped. When the working ends 309 of the first rod 301 and the second rod 302 rotate in the direction of moving away from each other, the thrust of the two working ends 309 on the two clamping plates 201 disappears. At this time, the spring-like structure can push the two clamping plates 201 away from each other to release the crucible.

[0031] Of course, as Figure 5 shown, in order to enable the working end 309 to push the clamping plate 201 more stably, a first protrusion 700 in the direction of the clamping plate 201 is provided at the working end 309, and a second protrusion 800 is also provided on the clamping plate 201, so that the working end 309 can push the clamping plate 201 to move a longer distance.

[0032] In the first embodiment, its operation method is the same as that of the traditional crucible tongs, that is, the first rod 301 and the second rod 302 are rotated to achieve the effect of clamping and releasing the crucible. The difference is that this device can also adjust the position of the clamping plate 201 during this process, so that when clamping, the clamping plate 201 can extend out. After the calcination is completed, the clamping plate 201 can return to the inside of the heat insulation cavity 101 to avoid accidental contact and scalding problems. In addition, when the two clamping plates 201 approach each other, they translate close to each other, so they can fit more closely to both sides of the square crucible, obtaining a larger contact area and making the clamping more stable.

[0033] Please refer to Figures 6 to 10 , in the second embodiment provided by the present application, asFigure 6 The frame 100 includes at least a first base body 104 and a second base body 105. An accommodation space is formed within the first base body 104 to constitute a heat insulation cavity 101. The first base body 104 is installed at the end of the second base body 105. In this embodiment, the second base body 105 is a tubular structure, and the inner space of the second base body 105 communicates with the accommodation space of the first base body 104.

[0034] Please refer to Figure 7 In this embodiment, the clamping head 200 includes a mounting seat 203 slidably installed on the first base body 104, and the clamping plate 201 is slidably installed on the mounting seat 203. In this embodiment, mounting columns 108 are fixed on the frame 100. The number of the mounting columns 108 is at least two. The mounting columns 108 penetrate through the mounting seat 203, such that the mounting seat 203 can slide relative to the frame 100.

[0035] The device further includes a connecting part 500. The connecting part 500 includes a connecting pipe 501, a sliding member 502, a connecting rod 503, a second elastic member 504, and a restricting member 505. The connecting pipe 501 is connected to the mounting seat 203. The sliding member 502 is slidably sleeved on the outer wall of the radial direction of the connecting pipe 501. The connecting rod 503 connects the sliding member 502 and the clamping plate 201. The second elastic member 504 abuts against the sliding member 502. The restricting member 505 is slidably installed on the connecting pipe 501 for restricting the position of the sliding member 502. The operating part 300 can directly push the connecting pipe 501, and the operating part 300 can also move relative to the connecting pipe 501 to adjust the position of the restricting member 505.

[0036] Refer to Figure 8 In this embodiment, the connecting pipe 501 and the mounting seat 203 are in a fixed connection relationship. One end of the connecting rod 503 is rotatably connected to the sliding member 502, and the other end is rotatably connected to the clamping plate 201. The second elastic member 504 applies a thrust force to the sliding member 502 in the first direction, and the first direction is marked as X. A part of the restricting member 505 is located inside the connecting pipe 501, and another part is located outside the connecting pipe 501. The part of the restricting member 505 located outside the connecting pipe 501 is used to restrict the sliding member 502. When the restricting member 505 does not move, the sliding member 502 cannot move in the first direction.

[0037] In this embodiment, the number of connecting rods 503 mounted on the sliding member 502 is two. The two connecting rods 503 are respectively rotatably connected to the two clamping plates 201. When the sliding member 502 moves in the first direction, since the distance between the sliding member 502 and the mounting base 203 decreases, the two connecting rods 503 push the two clamping plates 201 away from each other, causing the distance between the two clamping plates 201 to increase. When the sliding member 502 moves in the second direction, since the distance between the sliding member 502 and the mounting base 203 increases, the two connecting rods 503 pull the two clamping plates 201 towards each other, causing the distance between the two clamping plates 201 to decrease. Due to the action of the second elastic member 504, the sliding member 502 always remains in a state of abutting against the restraint member 505. Therefore, by only adjusting the position of the restraint member 505, the position of the sliding member 502 can be adjusted, and thus the distance between the two clamping plates 201 can be adjusted.

[0038] The operating portion 300 includes a limiting post 311. The limiting post 311 is threadedly connected to the connecting pipe 501. The limiting post 311 is buckled with the restraint member 505. The limiting post 311 has a threaded section 312, and the threaded section 312 is threadedly connected to the connecting pipe 501. Moreover, the end of the limiting post 311 also has a buckling body 310, and the buckling body 310 fits against the side of the restraint member 505 away from the sliding member 502. Therefore, in this embodiment, the first movement of the operating portion 300 is the limiting post 311 moving in the second direction, and the second movement of the operating portion 300 is the limiting post 311 moving in the first direction and controlling the position of the sliding member 502 by rotating the limiting post 311.

[0039] For example, when it is necessary to clamp the crucible with the pliers in this embodiment, first push the limiting post 311 in the first direction, so that the limiting post 311 pushes the connecting pipe 501 through the thread, and the connecting pipe 501 pushes the mounting base 203. The limiting post 311, the connecting pipe 501, and the mounting base 203 move synchronously in the first direction, causing the clamping plate 201 located on the mounting base 203 to disengage from the inside of the heat insulation cavity 101. At this time, by rotating the limiting post 311, the limiting post 311 rotates relative to the connecting pipe 501, so that the position of the limiting post 311 changes relative to the connecting pipe 501, and thus the position of the restraint member 505 changes synchronously, thereby adjusting the position of the sliding member 502, and thus adjusting the positions of the two clamping plates 201 so that the two clamping plates 201 can clamp the crucible.

[0040] After the crucible is released after calcination, rotate the limiting post 311 so that the limiting post 311 moves in the second direction relative to the connecting pipe 501. The restraint member 505 pushes the sliding member 502 to move in the second direction, and the distance between the two clamping plates 201 approaches, so that the distance between the two clamping plates 201 allows them to be received into the inside of the heat insulation cavity 101, avoiding the problem of being scalded by accidentally touching the high-temperature clamping plate 201.

[0041] Certainly, in order to avoid the problem that the limiting post 311 moves in the first direction and causes the clamping plate 201 to disengage from the heat insulation cavity 101 when the clamping plate 201 is in the stored state, the device further includes a positioning portion 600. The positioning portion 600 includes a third elastic member 601 and a latch 602 that abuts against the third elastic member 601. The operating portion 300 further includes a positioning body 304 connected to the limiting post 311. A push-pull inner body 306 that can move is provided inside the positioning body 304. The push-pull inner body 306 is connected to an operating post 307. A card slot 305 is formed in the positioning body 304. When the latch 602 extends into the inside of the card slot 305, the positioning body 304 can be locked.

[0042] In this embodiment, the push-pull inner body 306 is slidably connected to the limiting post 311, the limiting post 311 is rotatably connected to the positioning body 304. Preferably, the positioning body 304 is slidably and non-rotatably installed inside the second base body 105. The operating post 307 is fixedly connected to the push-pull inner body 306. The push-pull inner body 306 can be pushed and pulled through the operating post 307. In the locked state, the latch 602 is inserted into the inside of the card slot 305, thereby limiting the positioning body 304, the limiting post 311, the connecting pipe 501, the connecting seat, and the clamping plate 201, so that these structures cannot move in the first direction. When unlocking is required, the push-pull inner body 306 is pushed through the operating post 307. The thrust inner body can push the latch 602 to press the third elastic member 601, so that the latch 602 disengages from the card slot 305, and the locked state is released.

[0043] Finally, it should be pointed out that the methods and devices described in detail above are only embodiments, and those skilled in the art can modify these embodiments in different ways as long as they do not depart from the scope of the present invention.

Claims

1. A pair of tongs for clamping a square crucible, characterized in that: Comprising, A frame (100) provided with a heat insulation cavity (101); A clamping head (200) capable of moving relative to the frame (100), the clamping head (200) comprising at least two clamping plates (201); An operating part (300) mounted on the frame (100) and capable of driving the clamping head (200); When the operating part (300) makes a first movement, the clamping head (200) can enter the interior of the heat insulation cavity (101), and when the operating part (300) makes a second movement, the clamping head (200) can disengage from the heat insulation cavity (101), and the two clamping plates (201) in the clamping head (200) translate and approach each other.

2. The pliers for clamping a square crucible according to claim 1, characterized in that: A guiding structure (102) is provided on the frame (100), and the tongs for clamping a square crucible further comprises a sliding part (400) slidably connected to the guiding structure (102), and the clamping head (200) is mounted on the sliding part (400).

3. The pliers for clamping a square crucible according to claim 2, wherein: The operating part (300) comprises a first rod member (301) and a second rod member (302) rotatably connected by a shaft, and both the first rod member (301) and the second rod member (302) are provided with working ends (309); the space between the working ends (309) of the first rod member (301) and the second rod member (302) is a mating gap (303); The sliding part (400) comprises a seat body (401) slidably connected to the guiding structure (102), and a force-receiving body (402) connected to the seat body (401), and the force-receiving body (402) is located within the mating gap (303); When the operating part (300) makes a second movement, the working ends (309) of the first rod member (301) and the second rod member (302) rotate and approach each other to reduce the mating gap (303), and when the operating part (300) makes a first movement, the working ends (309) of the first rod member (301) and the second rod member (302) rotate and move away from each other to increase the mating gap (303).

4. The tongs for clamping a square crucible according to claim 2 or 3, characterized in that: The clamping head (200) comprises a cross bar (202) connected to the sliding part (400), and the clamping plates (201) are slidably mounted on the cross bar (202).

5. The tongs for clamping a square crucible according to claim 2 or 3, characterized in that: A first elastic member (103) is further mounted on the guiding structure (102), and the first elastic member (103) abuts against the sliding part (400).

6. The pliers for clamping a square crucible according to claim 1, wherein: The frame (100) comprises at least a first base body (104) and a second base body (105), and an accommodation space is formed within the first base body (104) to constitute the heat insulation cavity (101).

7. The tongs for clamping a square crucible according to claim 6, characterized in that: The clamping head (200) comprises a mounting seat (203) slidably mounted on the first base body (104), and the clamping plates (201) are slidably mounted on the mounting seat (203).

8. The tongs for clamping a square crucible according to claim 7, characterized in that: Also included is a connecting part (500); the connecting part (500) comprises, A connecting pipe (501) connected to the mounting seat (203); A sliding member (502) slidably sleeved on the outer wall of the radial direction of the connecting pipe (501); A connecting rod (503) connecting the sliding member (502) and the clamping plate (201); A second elastic member (504) abutted against the sliding member (502); A restraint member (505) is slidably mounted on the connecting pipe (501) for restraining the position of the sliding member (502); The operating part (300) can directly push the connecting pipe (501), and the operating part (300) can also move relative to the connecting pipe (501) to adjust the position of the restraint member (505).

9. The tongs for clamping a square crucible according to claim 8, wherein: The operating part (300) includes a limit post (311) which is threadedly connected to the connecting pipe (501), and the limit post (311) engages with the restraint member (505).

10. The tongs for clamping a square crucible according to claim 8 or 9, characterized in that: It further includes a positioning part (600), and the positioning part (600) includes a third elastic member (601) and a latch pin (602) abutted against the third elastic member (601); The operating part (300) further includes a positioning body (304) connected to the limit post (311), and a push-pull inner body (306) capable of moving is arranged inside the positioning body (304), and the push-pull inner body (306) is connected with an operating post (307); A card slot (305) is formed on the positioning body (304), and when the latch pin (602) extends into the inside of the card slot (305), the positioning body (304) can be locked.

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