A pair of pliers for gripping square crucibles

Abstract

The present invention relates to a crucible clamping tool, in particular, a pair of pliers for clamping a square crucible, comprising a frame provided with an insulating cavity; a clamping head capable of moving relative to the frame, the clamping head comprising at least two clamping plates; an operating portion mounted on the frame capable of driving the clamping head; when the operating portion makes a first movement, the clamping head can enter the interior of the insulating cavity, and when the operating portion makes a second movement, the clamping head can leave the insulating cavity, and the two clamping plates in the clamping head move closer together. During clamping, the two clamping plates move from both sides toward the crucible, so that the clamping plates can obtain a larger contact area with the crucible relative to the pointed end that rotates in the prior art, thereby being able to clamp the crucible more stably. After calcination is completed, the operating portion is controlled to make a first movement, at which time the clamping head can return to the interior of the insulating cavity, so that the two high-temperature clamping plates will not be accidentally touched by the operator, causing burns.

Description

Technical Field

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

[0002] Crucible tongs are a tool used to clamp the crucible. When the crucible is in use, the items to be calcined are placed inside the crucible. In order for the operator to place the crucible on the flame for calcination, the operator needs to use crucible tongs to clamp the crucible to avoid burns.

[0003] However, when clamping a square crucible, the pointed end of the existing crucible tongs rotates, making it difficult for the pointed end to have a large contact area with the crucible. Moreover, after calcination, the temperature of the pointed end is very high, and it is easy to cause burns if it is directly exposed to the outside. Summary of the Invention

[0004] Therefore, the technical problems to be solved by the present invention are: the problems of unstable clamping and burns caused by accidental touch.

[0005] The above technical problems are solved by the following technical solution: The present invention proposes a pair of pliers for clamping square crucibles, comprising a frame provided with an insulating cavity; a clamping head capable of moving relative to the frame, the clamping head comprising at least two clamping plates; an operating part mounted on the frame capable of driving the clamping head; when the operating part makes a first movement, the clamping head can enter the interior of the insulating cavity, and when the operating part makes a second movement, the clamping head can detach from the insulating cavity, and the two clamping plates in the clamping head move closer together.

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

[0007] In a preferred embodiment of the pliers for gripping a square crucible according to the present invention, the operating portion includes a first rod and a second rod rotatably connected by a shaft, the first rod and the second rod both having a working end; and a space between the working ends of the first rod and the second rod is a fitting gap.

[0008] The sliding portion includes a seat body slidably connected to the guide structure, and a force-bearing body connected to the seat body, wherein the force-bearing body is located in the fitting gap;

[0009] The second movement of the operating part causes the working ends of the first rod and the second rod to rotate closer to each other to reduce the fitting gap, and the first movement of the operating part causes the working ends of the first rod and the second rod to rotate away from each other to increase the fitting gap.

[0010] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention, the clamping head comprises a cross arm connected to the sliding portion, and the clamping plate is slidably mounted on the cross arm.

[0011] 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 guide structure, and the first elastic member abuts against the sliding portion.

[0012] In a preferred embodiment of the pliers for gripping a square crucible according to the present invention, the frame comprises at least a first base body and a second base body, and the first base body has an accommodating space therein to form a heat-insulating cavity.

[0013] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention, the clamping head comprises a mounting seat slidably mounted on the first base, and the clamping plate is slidably mounted on the mounting seat.

[0014] In a preferred embodiment of the pliers for gripping a square crucible according to the present invention, the pliers further include a connecting portion; the connecting portion includes,

[0015] a connecting pipe connected to the mounting seat;

[0016] a sliding member, which is slidably sleeved on the radial outer wall of the connecting pipe;

[0017] a connecting rod connecting the sliding member and the clamping plate;

[0018] a second elastic member abutting against the sliding member;

[0019] a restraining member, which is slidably mounted on the connecting pipe at a position for restraining the sliding member;

[0020] The operating portion can directly push the connecting pipe, and the operating portion can also move relative to the connecting pipe to adjust the position of the restraining member.

[0021] In a preferred embodiment of the pliers for clamping a square crucible according to the present invention, the operating portion includes a limiting column, the limiting column is threadedly connected to the connecting pipe, and the limiting column is buckled with the restraining member.

[0022] In a preferred embodiment of the pliers for gripping a square crucible according to the present invention, the pliers further include a positioning portion, the positioning portion including a third elastic member and a latch abutting against the third elastic member;

[0023] The operating part further includes a positioning body connected to the limiting column, wherein a movable push-pull built-in body is provided inside the positioning body, and the push-pull built-in body is connected to the operating column;

[0024] The positioning body is provided with a slot, and when the bayonet extends into the slot, the positioning body can be locked.

[0025] The beneficial effect of the present invention is that: by controlling the operating part to make a second movement, the clamping head can extend from the inside of the insulation chamber to clamp the crucible that needs to be clamped. When clamping, the two clamping plates move horizontally from both sides toward the crucible, so that the clamping plates can obtain a larger contact area with the crucible relative to the pointed end of the rotational movement in the prior art, so that the crucible can be clamped more stably. After calcination is completed, the operating part is controlled to make a first movement. At this time, the clamping head can return to the inside of the insulation chamber, so that the two high-temperature clamping plates will not be accidentally touched by the operator to cause burns. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following is a brief introduction to the drawings of the embodiments of the present invention. Obviously, the drawings described below only relate to some embodiments of the present invention and are not intended to limit the present invention. Among them:

[0027] Figure 1 shows a schematic diagram of the overall structure of the first embodiment;

[0028] Figure 2 Shows a front view of the overall structure of the first embodiment;

[0029] Figure 3 shows a partial structural diagram of a first embodiment;

[0030] Figure 4 A diagram showing a first state of the operating portion and the sliding portion of the first embodiment;

[0031] Figure 5 A diagram showing a second state of the operating portion and the sliding portion of the first embodiment;

[0032] Figure 6 shows a schematic diagram of the overall structure of the second embodiment;

[0033] Figure 7 shows a schematic diagram of the overall internal structure of the second embodiment;

[0034] Figure 8 A schematic diagram of the connecting portion structure of a second embodiment is shown;

[0035] Figure 9 A partial structural diagram of a second embodiment is shown;

[0036] Figure 10 A schematic structural diagram of a positioning portion in a second embodiment is shown.

[0037] 100, frame; 101, insulation cavity; 102, guide structure; 103, first elastic member; 104, first base; 105, second base; 106, plate 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; 302, second rod; 303, fitting clearance; 304, positioning body; 305, slot; 306, push-pull built-in Body; 307, operating column; 308, picking end; 309, working end; 310, buckle body; 311, limiting column; 312, threaded section; 400, sliding part; 401, seat body; 402, force-bearing body; 500, connecting part; 501, connecting pipe; 502, sliding part; 503, connecting rod; 504, second elastic part; 505, restraining part; 600, positioning part; 601, third elastic part; 602, latch; 700, first protrusion; 800, second protrusion. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to specific embodiments and the accompanying drawings.

[0039] The terms used in the present invention are those commonly used in the art in view of the functions of the present invention, but these terms may vary according to the intentions of those skilled in the art, precedents, or new technologies in the art. In addition, specific terms may be selected by the applicant, and in such cases, 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 rather as the meanings of the terms and the overall description of the present invention.

[0040] Reference Figure 1 and Figure 2 This embodiment provides a pair of pliers for clamping a square crucible, including a frame 100, which is provided with an insulating cavity 101. The device also includes a clamping head 200, which can move relative to the frame 100. The clamping head 200 includes at least two clamping plates 201. When the clamping head 200 is used to clamp and calcine the crucible, the clamping head 200 can extend from the inside of the insulating cavity 101 to clamp the crucible. After calcination is completed, the clamping head 200 can move back to the inside of the insulating cavity 101, thereby avoiding the problem of burns caused by accidental touch.

[0041] This device includes an operating part 300, which 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 interior of the insulation cavity 101, and when the operating part 300 makes a second movement, the clamping head 200 can detach from the insulation cavity 101, and the two clamps 201 in the clamping head 200 move closer together.

[0042] Therefore, when in use, the operator controls the operating part 300 to make the second movement, at which time 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 move horizontally 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, at which time 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.

[0043] 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 further include a sliding portion 400 slidably connected to the guide structure 102, and the clamping head 200 is mounted on the sliding portion 400. In this embodiment, the frame 100 includes two plate-shaped structures 106, and the guide structures 102 are mounted on the two plate-shaped structures 106. The guide structures 102 are cylindrical, 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 Marked as X in the middle, the clamping head 200 can be separated from the heat insulation cavity 101, and when it moves 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.

[0044] 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. 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.

[0045] Please refer to Figure 3 The operating portion 300 includes a first rod 301 and a second rod 302 connected by a shaft, with a fitting gap 303 between the first rod 301 and the second rod 302. The first rod 301 and the second rod 302 both have a pick-up end 308 and a working end 309, wherein the pick-up end 308 is used for the operator to pick up the device, and the gap between the two working ends 309 is the fitting gap 303. Figure 3The dotted line represents the fitting gap 303, but the fitting gap 303 is not limited to the dotted line position. The triangular area between the working ends 309 of the first rod 301 and the second rod 302 is the fitting gap 303. When the working ends 309 of the two rotate closer to each other, the fitting gap 303 decreases, and when the working ends 309 of the two rotate away from each other, the fitting gap 303 increases.

[0046] Please refer to Figures 3 to 5 The sliding portion 400 includes a seat body 401 slidably connected to the guide structure 102, and a force-bearing body 402 connected to the seat body 401. The force-bearing body 402 is located in the fitting gap 303. A through hole is provided on the seat body 401. The two guide structures 102 pass 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. The operating portion 300 performs a second movement to rotate the first rod 301 and the second rod 302 to reduce the fitting gap 303. The operating portion 300 performs a first movement to rotate the first rod 301 and the second rod 302 to increase the fitting gap 303. Figure 5 As shown, when the fitting gap 303 is reduced, the working ends 309 of the first rod 301 and the second rod 302 can squeeze the force-bearing body 402, so that the force-bearing body 402 moves in the first direction. In this embodiment, the clamping head 200 is directly installed on the force-bearing body 402. Therefore, the force-bearing body 402 moves in the first direction, which can drive the clamping head 200 to move in the first direction and away from the insulation cavity 101.

[0047] The guide structure 102 is further provided with a first elastic member 103, which contacts the sliding portion 400 and applies a thrust in the second direction to the sliding portion 400. When the fit gap 303 is small, the force-bearing body 402 and the seat 401 move in the first direction, pressing the first elastic member 103, so that the first elastic member 103 is compressed. Figure 4 As shown, when the first rod 301 and the second rod 302 rotate to increase the fitting gap 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 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 be selected as springs.

[0048] Continue to refer Figure 3 and Figure 4The clamping head 200 includes a cross arm 202 connected to the sliding part 400, and the clamping plate 201 can be slidably installed on the cross arm 202. When the cross arm 202 and the sliding part 400 are connected, the cross arm 202 is directly installed on the force-bearing body 402. The clamping plate 201 can be slidably installed in the cross arm 202 in many ways. For example, a slide groove is opened on the cross arm 202, and the clamping plate 201 is installed on the slide groove through a slider structure, and then slidably installed on the cross arm 202. When the two clamping plates 201 are close to each other, they can clamp the crucible. When the two clamping plates 201 are away from each other, the crucible can be put down.

[0049] Therefore, it is more preferred to set a spring-like structure inside the slide groove, which will press the spring-like structure when the two clamps 201 approach each other. When the thrust on the two clamps 201 disappears, the two clamps 201 move away from each other under the push of the spring-like structure, thereby lowering the crucible.

[0050] 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 a direction approaching each other, the two working ends 309 can contact the two clamping plates 201 respectively and push the two clamping plates 201 to move in a direction approaching each other, so that the gap between the two clamping plates 201 is reduced so that the crucible can be clamped. When the working ends 309 of the first rod 301 and the second rod 302 rotate in a direction 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, thereby loosening the crucible.

[0051] Of course, if Figure 5 As shown, in order to enable the working end 309 to push the splint 201 more stably, the working end 309 is provided with a first protrusion 700 toward the splint 201, and a second protrusion 800 is also provided on the splint 201, so that the working end 309 can push the splint 201 to move a longer distance.

[0052] 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 the present device can also adjust the position of the clamping plate 201 during this process, so that when clamping, the clamping plate 201 can be extended. After calcination is completed, the clamping plate 201 can be returned to the inside of the insulation cavity 101 to avoid accidental touch and burns. In addition, when the two clamping plates 201 approach each other, they move closer to each other, so that they can fit more closely to the two sides of the square crucible, obtain a larger contact area, and make the clamping more stable.

[0053] Please refer to Figures 6 to 10 , as the second embodiment provided in this application, as Figure 6 The frame 100 includes at least a first base 104 and a second base 105. The first base 104 has an accommodating space to form an insulating cavity 101. The first base 104 is installed on the end of the second base 105. In this embodiment, the second base 105 is a tubular structure, and the space inside the tube of the second base 105 is connected to the accommodating space of the first base 104.

[0054] Please refer to Figure 7 In this embodiment, the clamping head 200 includes a mounting seat 203 slidably mounted on the first base 104, and the clamping plate 201 can be slidably mounted on the mounting seat 203. In this embodiment, a mounting column 108 is fixed on the frame 100, and the number of the mounting columns 108 is at least two. The mounting columns 108 pass through the mounting seat 203, so that the mounting seat 203 can slide relative to the frame 100.

[0055] The device also includes a connecting part 500; the connecting part 500 includes a connecting tube 501, a sliding member 502, a connecting rod 503, a second elastic member 504 and a restraining member 505, the connecting tube 501 is connected to the mounting seat 203; the sliding member 502 is slidably sleeved on the radial outer wall of the connecting tube 501; the connecting rod 503 connects the sliding member 502 and the splint 201; the second elastic member 504 is against the sliding member 502; the restraining member 505 is slidably installed on the connecting tube 501 for restraining the position of the sliding member 502; the operating part 300 can directly push the connecting tube 501, and the operating part 300 can also move relative to the connecting tube 501 to adjust the position of the restraining member 505.

[0056] refer to Figure 8 In this embodiment, the connecting tube 501 and the mounting seat 203 are fixedly connected, one end of the connecting rod 503 is rotatably connected to the sliding member 502, and the other end is rotatably connected to the splint 201, and the second elastic member 504 applies a thrust to the sliding member 502 in a first direction, and the first direction is marked as X. The restraining member 505 is partially located inside the connecting tube 501, and the other part is located outside the connecting tube 501. The part of the restraining member 505 outside the connecting tube 501 is used to restrain the sliding member 502. When the restraining member 505 does not move, the sliding member 502 cannot move in the first direction.

[0057] In this embodiment, there are two connecting rods 503 installed on the sliding member 502, and the two connecting rods 503 are rotatably connected to the two clamping plates 201 respectively. When the sliding member 502 moves in the first direction, the distance between the sliding member 502 and the mounting seat 203 is reduced, and the two connecting rods 503 push the two clamping plates 201 in the direction of moving away from each other, so that the distance between the two clamping plates 201 increases. When the sliding member 502 moves in the second direction, the distance between the sliding member 502 and the mounting seat 203 increases, and the two connecting rods 503 pull the two clamping plates 201 in the direction of approaching each other, so that the distance between the two clamping plates 201 is reduced. Due to the action of the second elastic member 504, the sliding member 502 always keeps in contact with the constraint member 505. Therefore, it is only necessary to adjust the position of the constraint member 505 to adjust the position of the sliding member 502, and thus the distance between the two clamping plates 201 can be adjusted.

[0058] The operating part 300 includes a limiting column 311, which is threadedly connected to the connecting tube 501, and the limiting column 311 is buckled with the restraint 505. The limiting column 311 has a threaded section 312, and the threaded section 312 is threadedly connected to the connecting tube 501. The end of the limiting column 311 also has a buckling body 310, and the buckling body 310 is fitted with the side of the restraint 505 away from the sliding member 502. Therefore, in this embodiment, the first movement of the operating part 300 is the movement of the limiting column 311 in the second direction, and the second movement of the operating part 300 is the movement of the limiting column 311 in the first direction and the position of the sliding member 502 is controlled by rotating the limiting column 311.

[0059] For example, when it is necessary to use the pliers in this embodiment to clamp the crucible, first push the limit column 311 to move in the first direction, so that the limit column 311 pushes the connecting tube 501 through the thread, and the connecting tube 501 pushes the mounting seat 203, and the limit column 311, the connecting tube 501, and the mounting seat 203 move synchronously in the first direction, so that the clamp 201 located on the mounting seat 203 is disengaged from the inside of the insulation cavity 101. At this time, by rotating the limit column 311, the limit column 311 is rotated relative to the connecting tube 501, so that the position of the limit column 311 changes relative to the connecting tube 501, so that the position of the constraint member 505 changes synchronously, thereby adjusting the position of the sliding member 502, thereby adjusting the position of the two clamps 201, so that the two clamps 201 can clamp the crucible.

[0060] After the calcination is completed and the crucible is released, the limit column 311 is rotated so that the limit column 311 moves in the second direction relative to the connecting tube 501, and the restraining member 505 pushes the sliding member 502 to move in the second direction. The distance between the two splints 201 is shortened, so that the spacing between the two splints 201 can allow them to be retracted into the interior of the insulation cavity 101, avoiding the problem of burns caused by accidentally touching the high-temperature splint 201.

[0061] Of course, in order to avoid the problem that the limiting column 311 moves in the first direction and causes the splint 201 to separate from the insulation cavity 101 when the splint 201 is stored, the present device also includes a positioning part 600, the positioning part 600 includes a third elastic member 601, and a pin 602 that abuts against the third elastic member 601; the operating part 300 also includes a positioning body 304 connected to the limiting column 311, and a movable push-pull built-in body 306 is arranged inside the positioning body 304, and the push-pull built-in body 306 is connected to the operating column 307; a slot 305 is provided on the positioning body 304, and when the pin 602 extends into the slot 305, it can lock the positioning body 304.

[0062] In this embodiment, the push-pull built-in body 306 is slidably connected to the limiting column 311, and the limiting column 311 is rotatably connected to the positioning body 304. The positioning body 304 is preferably slidably and non-rotatably installed inside the second base 105. The operating column 307 is fixedly connected to the push-pull built-in body 306. The push-pull built-in body 306 can be pushed and pulled by the operating column 307. When in the locked state, the pin 602 is inserted into the inside of the slot 305, thereby limiting the positioning body 304, the limiting column 311, the connecting tube 501, the connecting seat, and the splint 201, so that these structures cannot move in the first direction. When unlocking is required, the push-pull built-in body 306 is pushed by the operating column 307, and the thrust built-in body can push the pin 602 to press the third elastic member 601, so that the pin 602 disengages from the slot 305, thereby releasing the locked state.

[0063] Finally, it should be pointed out that the methods and devices described in detail above are merely embodiments, and those skilled in the art can modify these embodiments in different ways without departing from the scope of the present invention.

Claims

1. A pair of pliers for gripping a square crucible, characterized by: include, A frame (100) having an insulating 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 portion (300) mounted on the frame (100) and capable of driving the clamping head (200); When the operating part (300) performs a first movement, the clamping head (200) can enter the interior of the heat-insulating cavity (101); when the operating part (300) performs a second movement, the clamping head (200) can be separated from the heat-insulating cavity (101), and the two clamping plates (201) in the clamping head (200) move closer together; The frame (100) is provided with a guide structure (102), the pliers for clamping the square crucible further include a sliding portion (400) slidably connected to the guide structure (102), and the clamping head (200) is mounted on the sliding portion (400); The operating portion (300) comprises a first rod (301) and a second rod (302) rotatably connected via an axis, wherein the first rod (301) and the second rod (302) are both provided with a working end (309); a space between the working ends (309) of the first rod (301) and the second rod (302) is a fitting gap (303); The sliding portion (400) comprises a seat body (401) slidably connected to the guide structure (102), and a force-bearing body (402) connected to the seat body (401), wherein the force-bearing body (402) is located in the fitting gap (303); The second movement of the operating part (300) is to rotate the working ends (309) of the first rod (301) and the second rod (302) toward each other to reduce the fitting gap (303), and the first movement of the operating part (300) is to rotate the working ends (309) of the first rod (301) and the second rod (302) away from each other to increase the fitting gap (303).

2. The pliers for gripping a square crucible according to claim 1, characterized in that: The clamping head (200) comprises a cross arm (202) connected to the sliding portion (400), and the clamping plate (201) is slidably mounted on the cross arm (202).

3. The pliers for gripping a square crucible according to claim 1, characterized in that: A first elastic member (103) is also installed on the guide structure (102), and the first elastic member (103) is in contact with the sliding portion (400).

4. A pair of pliers for gripping a square crucible, characterized in that: include, A frame (100) having an insulating 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 portion (300) mounted on the frame (100) and capable of driving the clamping head (200); When the operating part (300) performs a first movement, the clamping head (200) can enter the interior of the heat-insulating cavity (101); when the operating part (300) performs a second movement, the clamping head (200) can be separated from the heat-insulating cavity (101), and the two clamping plates (201) in the clamping head (200) move closer together; The frame (100) comprises at least a first base (104) and a second base (105); the first base (104) has an accommodating space therein, thereby forming a heat-insulating cavity (101); The clamping head (200) comprises a mounting seat (203) slidably mounted on the first base (104), and the clamping plate (201) can be slidably mounted on the mounting seat (203); Also includes a connecting portion (500); The connecting portion (500) includes a connecting pipe (501) connected to the mounting seat (203); A sliding member (502) is slidably sleeved on the radial outer wall of the connecting pipe (501); a connecting rod (503) connecting the sliding member (502) and the clamping plate (201); a second elastic member (504) which abuts against the sliding member (502); A restraining member (505) is slidably mounted on the connecting pipe (501) to restrain the sliding member (502); The operating portion (300) can directly push the connecting tube (501), and the operating portion (300) can also move relative to the connecting tube (501) to adjust the position of the restraining member (505); The operating portion (300) comprises a limiting column (311), the limiting column (311) is threadedly connected to the connecting pipe (501), and the limiting column (311) is locked with the restraining member (505).

5. The pliers for gripping a square crucible according to claim 4, characterized in that: It also includes a positioning portion (600), the positioning portion (600) including a third elastic member (601) and a latch (602) abutting against the third elastic member (601); The operating portion (300) further comprises a positioning body (304) connected to the limiting column (311), a movable push-pull built-in body (306) is provided inside the positioning body (304), and the push-pull built-in body (306) is connected to the operating column (307); A locking slot (305) is provided on the positioning body (304), and when the locking pin (602) extends into the interior of the locking slot (305), it can lock the positioning body (304).

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