Sapphire Crystal Rod Crystal Axis Detection and Positioning Device

Abstract

The present invention discloses a sapphire crystal bar crystal axis detection and positioning device, which relates to the technical field of sapphire crystal bar crystal axis detection. The present invention includes a frame, a lifting cylinder is fixedly installed at the bottom of the frame, a top tray is fixedly installed at the telescopic end of the lifting cylinder, two sets of guide frames are fixedly installed at the top of the frame, a clamping assembly is slidably connected inside the guide frames, a top frame is fixedly installed at the top of the guide frames, an infrared emitter, an infrared incident point indicating needle and a receiver are fixedly installed at the inner top of the top frame. In the present invention, the crystal bar is pre-clamped and fixed by a pre-clamping cleaning sleeve, and then different amounts of cooling water are injected into the clamping inner liner of the lower collar. By controlling the internal pressure of the clamping inner liner, the position of the crystal bar can be adjusted to make the crystal axis coincide with the axis of the positioning assembly, with high adjustment accuracy. At the same time, the cooling water in the clamping inner liner of the upper collar is in a circulating state, keeping the temperature of the crystal bar stable and further improving the detection accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of sapphire crystal bar crystal axis detection, and particularly to a sapphire crystal bar crystal axis detection and positioning device. Background Art

[0002] After an artificial sapphire crystal is crystallized and processed into a crystal bar, the axial direction of the geometric shape of the crystal bar will be slightly deviated from the axial direction of the crystal forming the crystal bar. This deviation will cause the crystal axis direction of the wafers processed subsequently to be incorrect. When parallel light passes through the wafers, the incorrect crystal axis will cause an increase in the scattering amount of light, resulting in a decrease in the quality of the wafers. For a newly formed crystal bar, for subsequent processing procedures, first, rough machining is required to grind the side surface of the crystal bar into a cylindrical surface and cut the two ends of the crystal bar into end faces perpendicular to the cylindrical surface. For the crystal bar after rough grinding, in order to correct the deviation between the geometric axis of the crystal bar cylinder and the crystal axis direction and ensure that the crystal axis direction of the crystal bar is perpendicular to the surface of the cut wafer during subsequent crystal bar slicing processing, it is necessary to finely grind the cylindrical surface of the crystal bar, correct the geometric axis of the cylindrical crystal bar, and make the geometric axis of the cylindrical crystal bar consistent with the crystal axis direction of the crystal bar.

[0003] In a Chinese patent (publication number: CN106352816B), a sapphire crystal bar crystal axis detection and positioning device is disclosed. This device consists of a moving base, a crystal axis positioning device, and a crystal axis detection device. Most of this patent and the prior art use laser to irradiate the end face of the crystal bar, and a reflected light receiving device is used to receive the reflected light from the end face. While receiving data, the spatial position of the axis of the cylindrical crystal bar is adjusted, and by observing the change in the received data, the crystal axis of the crystal bar is determined to make the crystal axis consistent with the axis of the fixing device. This method has the following defects:

[0004] During the detection process, the sapphire crystal bar will absorb a certain amount of heat and undergo thermal expansion under laser irradiation. The thermal expansion coefficient of sapphire is relatively low, but under high-power laser irradiation, the surface of the crystal bar will produce minute deformations due to local heating. These deformations will change the angle of the laser reflected by the surface of the crystal bar, thereby affecting the detection accuracy of the axial laser detection system.

[0005] After the detection and positioning of the fixed crystal bar are completed, the position adjustment device is taken to the bonding rack of the crystal bar, and one end face of the crystal bar is bonded to the fixed seat. It is difficult to keep the crystal axis direction of the crystal bar perpendicular to the end face of the fixed seat on the bonding rack. The uniformity of the glue and the bonding angle will both affect the accuracy, and the subsequent processing is difficult.

[0006] Since the end face of the crystal bar is used as the detection reference surface, once there are impurities such as dust on the end face of the crystal bar, it will affect the laser reflection and reduce the detection accuracy. Summary of the Invention

[0007] The object of the present invention is: to solve the above problems, the present invention provides a sapphire crystal bar crystal axis detection and positioning device.

[0008] The present invention specifically adopts the following technical solutions to achieve the above object:

[0009] The sapphire crystal bar crystal axis detection and positioning device includes a frame. A lifting cylinder is fixedly installed at the bottom of the frame. A top tray is fixedly installed at the telescopic end of the lifting cylinder. Two groups of guide frames are fixedly installed at the top of the frame. A clamping assembly is slidably connected inside the guide frames;

[0010] A positioning assembly is fixedly installed inside the guide frames. The positioning assembly includes an upper collar and a lower collar fixedly installed inside the guide frames. A pre-clamping cleaning sleeve is arranged between the upper collar and the lower collar. The clamping assembly can clamp the pre-clamping cleaning sleeve. Rubber bristles are arranged on the inner wall of the pre-clamping cleaning sleeve. Multiple groups of clamping inner cavities are annularly opened inside both the upper collar and the lower collar. Buffer assemblies are arranged at the top of the upper collar and the bottom of the lower collar;

[0011] A top frame is fixedly installed at the top of the guide frames. An infrared emitter, an infrared incident point indicating needle and a receiver are fixedly installed on the inner top of the top frame. The infrared incident point indicating needle is located between the infrared emitter and the receiver.

[0012] Further, the clamping assembly includes a lifting cylinder and an installation slider. The lifting cylinder is fixedly installed at the top of the guide frames. The installation slider is slidably connected in the guide frames. A clamping cylinder is fixedly installed on the side of the installation slider away from the positioning assembly. A clamping plate is fixedly installed at the telescopic end of the clamping cylinder.

[0013] Further, a pinch roller is rotatably installed inside the clamping plate.

[0014] Further, two groups of guiding holes are opened inside both the upper collar and the lower collar. Connecting guide posts are inserted into the guiding holes. Locking screw holes are opened on the outer sides of both the upper collar and the lower collar. The locking screw holes penetrate through to the guiding holes. Locking bolts are threadedly connected inside the locking screw holes.

[0015] Further, multiple groups of wireless control solenoid valves are fixedly installed at one end of both the upper collar and the lower collar close to the pre-clamping cleaning sleeve. The wireless control solenoid valves are arranged corresponding to the clamping inner cavities. One end of the wireless control solenoid valve is communicated with the clamping inner cavity, and the other end is connected with a connecting ring pipe. Two connecting heads are arranged on the outer side of the connecting ring pipe on the upper collar, and a single connecting head is arranged on the outer side of the connecting ring pipe on the lower collar. Pressure sensors are arranged inside the clamping inner cavities.

[0016] Further, the buffer assembly includes a buffer top plate which is threadedly connected to the upper collar. A plurality of buffer cavities are formed inside the buffer top plate. The buffer cavities are arranged corresponding to the clamping inner liner, and the buffer cavities are communicated with the clamping inner liner. A buffer piston is hermetically and slidably connected inside the buffer cavity.

[0017] Further, a disk cover is threadedly connected to the top of the buffer cavity. The buffer piston penetrates through the disk cover. The tops of a plurality of buffer pistons are fixedly connected to an adjusting ring simultaneously. An adjusting threaded hole is formed inside the adjusting ring. An adjusting screw rod is rotatably installed on the top of the disk cover, and the adjusting screw rod is threadedly connected in the adjusting threaded hole.

[0018] Further, an installation plate is arranged inside the guide frame. A connecting threaded hole is formed inside the installation plate. Installation threaded holes are formed on the outer sides of the upper collar and the lower collar.

[0019] The beneficial effects of the present invention are as follows:

[0020] In the present invention, by placing the crystal bar on the top tray, the lifting cylinder presses the crystal bar onto the pre-clamping cleaning sleeve through the top tray, and the clamping assembly squeezes the pre-clamping cleaning sleeves above the crystal bar together. The clamping assembly and the crystal bar rise together. Therefore, when the crystal bar is pushed into the pre-clamping cleaning sleeve, the detection end face is cleaned by the rubber brush hairs on the inner wall of the pre-clamping cleaning sleeve, improving the detection accuracy. At the same time, the rubber brush hairs are tightly squeezed between the crystal bar and the pre-clamping cleaning sleeve, and can pre-clamp the crystal bar.

[0021] In the present invention, the crystal bar is pre-clamped and fixed by the pre-clamping cleaning sleeve, and then different amounts of cooling water are injected into the clamping inner liner of the lower collar to control the internal pressure of the clamping inner liner, so that the position of the crystal bar can be adjusted to make the axis of the crystal coincide with the axis of the positioning assembly. The adjustment accuracy is high and the adjustment efficiency is high. At the same time, the cooling water in the clamping inner liner of the upper collar is in a circulating state, keeping the temperature of the crystal bar stable and further improving the detection accuracy.

[0022] In the present invention, through the arrangement of the upper collar and the lower collar, after the crystal bar is fixed, the upper collar and the lower collar can be directly installed on the subsequent fine grinding equipment, and fine grinding can be carried out by rotating the clamping assembly. And through the alternating clamping of the upper collar and the lower collar, it is ensured that all surfaces of the crystal bar can be finely ground without bonding the crystal bar, and the processing accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 is an exploded view of the overall structure of the present invention;

[0025] Figure 3 is a schematic diagram of the structure of the guide frame of the present invention;

[0026] Figure 4 It is a schematic diagram of the top frame structure of the present invention;

[0027] Figure 5 It is a schematic diagram of the positioning component of the present invention Figure 1 ;

[0028] Figure 6 It is a schematic diagram of the positioning component of the present invention Figure 2 ;

[0029] Figure 7 It is an exploded view of the positioning component of the present invention.

[0030] Reference numerals: 1, frame; 11, lifting cylinder; 12, top tray; 2, guide frame; 21, mounting plate; 22, lifting cylinder; 23, mounting slider; 24, clamping cylinder; 25, clamping plate; 3, positioning component; 31, upper collar; 32, lower collar; 33, pre-clamping cleaning sleeve; 34, connecting guide post; 35, locking bolt; 36, connecting ring pipe; 37, connector; 38, wireless control solenoid valve; 39, clamping inner liner; 310, buffer top plate; 311, buffer piston; 312, disc cover; 313, adjusting ring; 314, adjusting screw; 315, mounting threaded hole; 4, top frame; 5, infrared incident point indicating needle; 6, infrared emitter; 7, receiver. Detailed implementation manners

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0032] Example 1, as Figures 1 - 7 shown, a sapphire crystal bar crystal axis detection and positioning device includes a frame 1, a lifting cylinder 11 is fixedly installed at the bottom of the frame 1, a top tray 12 is fixedly installed at the telescopic end of the lifting cylinder 11, two groups of guide frames 2 are fixedly installed at the top of the frame 1, and a clamping component is slidably connected inside the guide frame 2;

[0033] A positioning component 3 is fixedly installed inside the guide frame 2. The positioning component 3 includes an upper collar 31 and a lower collar 32 fixedly installed inside the guide frame 2. A pre-clamping cleaning sleeve 33 is arranged between the upper collar 31 and the lower collar 32. The clamping component can clamp the pre-clamping cleaning sleeve 33. Rubber bristles are arranged on the inner wall of the pre-clamping cleaning sleeve 33. Multiple groups of clamping inner liners 39 are annularly opened inside both the upper collar 31 and the lower collar 32. Buffer components are arranged at the top of the upper collar 31 and the bottom of the lower collar 32;

[0034] A top frame 4 is fixedly installed at the top of the guide frame 2. An infrared emitter 6, an infrared incident point indicating needle 5 and a receiver 7 are fixedly installed at the inner top of the top frame 4. The infrared incident point indicating needle 5 is located between the infrared emitter 6 and the receiver 7.

[0035] During use, place the ingot on the top tray 12, then the clamping assembly clamps and flattens the pre-clamping cleaning sleeve 33. Next, control the lifting cylinder 11 to operate. The lifting cylinder 11 drives the top tray 12 to rise, and the top tray 12 drives the ingot to insert through the lower collar 32 into the pre-clamping cleaning sleeve 33. When the ingot is inserted into the flattened position, the rubber bristles on the inner wall of the pre-clamping cleaning sleeve 33 contact the ingot detection end face. As the ingot is inserted, the flattened position moves upward, and the ingot detection end face is cleaned. Subsequently, the clamping assembly releases to allow the ingot to pass through the pre-clamping cleaning sleeve 33 and through the upper collar 31. It should be noted that the inner diameter of the pre-clamping cleaning sleeve 33 is larger than the outer diameter of the ingot, but the length of the rubber bristles inside it is longer. Therefore, the rubber bristles are tightly pressed between the ingot and the pre-clamping cleaning sleeve 33, and the ingot is pre-clamped through friction. Then, the infrared emitter 6 emits laser light that irradiates the end face of the ingot, and the receiver 7 receives the reflected laser light. While receiving the data, inject cooling water into the clamping inner bladder 39 of the lower collar 32, and control the pressure in the clamping inner bladders 39 at different positions respectively, so as to adjust the spatial position of the axis of the cylindrical ingot. By observing the change of the received data, determine the crystal axis of the ingot, make the crystal axis consistent with the axis of the fixing device, and at the same time inject flowing cooling water into the clamping inner bladder 39 of the upper collar 31 to cool the upper end face of the ingot and keep it at a constant temperature, improving the detection accuracy.

[0036] After the adjustment is completed, the clamping inner bladder 39 of the lower collar 32 fixes the ingot to complete the positioning of the ingot. Then, make the clamping assembly press against the outside of the pre-clamping cleaning sleeve 33 to limit the ingot. Subsequently, the clamping inner bladder 39 in the upper collar 31 clamps the ingot to perform secondary positioning and fixing. Remove the positioning assembly 3 from the guide frame 2, and install the lower collar 32 on the rotation center of the precision grinding equipment. Just ensure that the axis of the lower collar 32 coincides with the axis of the rotation center of the precision grinding equipment. Then, make part of the cooling water in the clamping inner bladder 39 of the upper collar 31 enter the buffer assembly. At this time, the upper collar 31 can move relative to the ingot. The upper collar 31 approaches the lower collar 32, and the pre-clamping cleaning sleeve 33 is received between the upper collar 31 and the lower collar 32. At this time, the upper half of the ingot can be ground. After the grinding is completed, make the upper collar 31 move away from the lower collar 32 again, the pre-clamping cleaning sleeve 33 unfolds, inject the cooling water in the buffer assembly of the upper collar 31 into the clamping inner bladder 39 again, the upper collar 31 clamps the ingot again, the cooling water in the clamping inner bladder 39 of the lower collar 32 enters the buffer assembly, the lower collar 32 releases the ingot, the lower collar 32 approaches the upper collar 31, and through the alternating clamping of the lower collar 32 and the upper collar 31, the surface of the ingot can be comprehensively precision ground.

[0037] Embodiment 2. On the basis of the above embodiment, it further includes that the clamping assembly includes a lifting air cylinder 22 and a mounting slider 23. The lifting air cylinder 22 is fixedly installed at the top of the guide frame 2. The mounting slider 23 is slidably connected in the guide frame 2. A clamping air cylinder 24 is fixedly installed on the side of the mounting slider 23 away from the positioning assembly 3. A clamping plate 25 is fixedly installed at the telescopic end of the clamping air cylinder 24.

[0038] Furthermore, a clamping roller is rotatably installed inside the clamping plate 25.

[0039] At the beginning, the lifting air cylinder 22 first drives the mounting slider 23 to descend to the lower half of the pre-clamped cleaning sleeve 33. Subsequently, the clamping air cylinder 24 is controlled to operate. The clamping air cylinder 24 drives the clamping plate 25 to approach the pre-clamped cleaning sleeve 33. The two clamping plates 25 clamp the pre-clamped cleaning sleeve 33 flat through the clamping rollers. Then the lifting air cylinder 22 cuts off the air pressure and does not generate a limiting force on the mounting slider 23. As the crystal bar is inserted upward, the crystal bar pushes the clamping plate 25 to rise relative to the pre-clamped cleaning sleeve 33, and the clamping rollers roll along the pre-clamped cleaning sleeve 33, causing the flattened position to move upward, thereby achieving the effect of cleaning the end face of the crystal bar.

[0040] Embodiment 3. On the basis of the above embodiment, it further includes that two sets of guide holes are respectively opened inside the upper collar 31 and the lower collar 32. A connecting guide post 34 is inserted into the guide holes. Locking screw holes are respectively opened on the outer sides of the upper collar 31 and the lower collar 32, and the locking screw holes penetrate through to the guide holes. A locking bolt 35 is threadedly connected inside the locking screw holes.

[0041] Through the arrangement of the connecting guide post 34, during detection, the locking bolts 35 on the upper collar 31 and the lower collar 32 are locked simultaneously, and the distance between the upper collar 31 and the lower collar 32 is fixed, so the detection is stable. After the positioning of the crystal bar is completed, the positioning assembly 3 is removed, and then the connecting guide post 34 is fixedly installed at the rotation center of the fine grinding assembly. It only needs to ensure that the axis of the lower collar 32 coincides with the axis of the rotation center of the fine grinding equipment. Therefore, during fine grinding, by loosening the corresponding locking bolts 35, stable alternating clamping of the upper collar 31 and the lower collar 32 can be achieved, and the operation is more convenient.

[0042] Embodiment 4. On the basis of the above embodiment, it further includes that a plurality of wireless control solenoid valves 38 are respectively fixedly installed at one end of the upper collar 31 and the lower collar 32 close to the pre-clamped cleaning sleeve 33. The wireless control solenoid valves 38 are arranged corresponding to the clamping inner liner 39. One end of the wireless control solenoid valve 38 is communicated with the clamping inner liner 39, and the other end is connected with a connecting ring pipe 36. Two connecting heads 37 are arranged on the outer side of the connecting ring pipe 36 on the upper collar 31, and a single connecting head 37 is arranged on the outer side of the connecting ring pipe 36 on the lower collar 32. Pressure sensors are respectively arranged inside the clamping inner liners 39.

[0043] During detection, connect the external cooling water pipe to the connector 37, and control the flow rate into the clamping inner liner 39 by wirelessly controlling the solenoid valve 38. In this way, within the same time, the pressures in different clamping inner liners 39 can be made different. The control is simple. Since there are two groups of connectors 37 arranged on the outer side of the connecting ring pipe 36 on the upper collar 31, and the two connectors 37 are simultaneously connected to the cooling water pipe, the flow of the cooling water can be realized, achieving the cooling effect. There is a single group of connectors 37 arranged on the outer side of the connecting ring pipe 36 on the lower collar 32, which is connected to a group of cooling water pipes, enabling the control of the internal pressure of the clamping inner liner 39. While fixing the clamping, the position adjustment of the ingot can be realized.

[0044] Embodiment 5, on the basis of the above embodiment, further includes that the buffer assembly includes a buffer top plate 310, the buffer top plate 310 is threadedly connected to the upper collar 31, a plurality of buffer cavities are formed inside the buffer top plate 310, the buffer cavities are arranged corresponding to the clamping inner liner 39, the buffer cavities are communicated with the clamping inner liner 39, and a buffer piston 311 is hermetically and slidably connected inside the buffer cavity.

[0045] Further, a disc cover 312 is threadedly connected to the top of the buffer cavity, the buffer piston 311 penetrates through the disc cover 312, the tops of the plurality of buffer pistons 311 are fixedly connected to an adjusting ring 313 at the same time, an adjusting threaded hole is formed inside the adjusting ring 313, and an adjusting screw 314 is rotatably installed on the top of the disc cover 312, and the adjusting screw 314 is threadedly connected to the adjusting threaded hole.

[0046] After the adjustment is completed, the clamping inner liner 39 of the lower collar 32 fixes the ingot, completing the positioning of the ingot. Then, the clamping assembly is abutted against the outer side of the pre-clamping cleaning sleeve 33 to limit the ingot. Subsequently, the clamping inner liner 39 in the upper collar 31 clamps the ingot, performing secondary positioning and fixing of the ingot. The wireless control solenoid valve 38 is closed simultaneously, and the cooling water pipe is removed from the connector 37, then the positioning assembly 3 can be removed from the guide frame 2. The lower collar 32 is installed on the rotation center of the fine grinding device, and it only needs to ensure that the axis of the lower collar 32 coincides with the axis of the rotation center of the fine grinding device. Then, rotate the adjusting screw 314, the adjusting screw 314 drives the adjusting ring 313 to rise, the adjusting ring 313 drives the buffer piston 311 to rise, and the buffer piston 311 enables cooling water to enter the buffer cavity. At this time, a part of the cooling water in the clamping inner liner 39 of the upper collar 31 enters the buffer cavity. At this time, the upper collar 31 can move relative to the ingot, the upper collar 31 approaches the lower collar 32, and the pre-clamping cleaning sleeve 33 is received between the upper collar 31 and the lower collar 32. At this time, the upper half of the ingot can be ground. After the grinding is completed, the upper collar 31 will be moved away from the lower collar 32 again, the pre-clamping cleaning sleeve 33 is unfolded, the adjusting screw 314 is reversed, and the cooling water in the buffer cavity is pressed into the clamping inner liner 39 again through the buffer piston 311. The cooling water in the buffer assembly of the upper collar 31 is injected into the clamping inner liner 39 again. It should be noted that the cooling water in the corresponding buffer cavity enters the corresponding clamping inner liner 39 to ensure that the position of the ingot does not change. The upper collar 31 clamps the ingot again, the cooling water in the clamping inner liner 39 of the lower collar 32 enters the buffer assembly, the lower collar 32 releases the ingot, the lower collar 32 approaches the upper collar 31, and through the alternating clamping of the lower collar 32 and the upper collar 31, the surface of the ingot can be comprehensively ground.

[0047] Embodiment Six, on the basis of the above embodiment, further includes that an installation plate 21 is arranged inside the guide frame 2, a connecting threaded hole is opened inside the installation plate 21, and installation threaded holes 315 are opened on the outer sides of the upper collar 31 and the lower collar 32. Through this design, it is convenient for the disassembly and installation of the positioning assembly 3.

[0048] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Sapphire crystal bar crystal axis detection and positioning device, including a frame (1), characterized in that, A jacking cylinder (11) is fixedly installed at the bottom of the frame (1), a top tray (12) is fixedly installed at the telescopic end of the jacking cylinder (11), two groups of guide frames (2) are fixedly installed at the top of the frame (1), and a clamping assembly is slidably connected inside the guide frame (2). A positioning assembly (3) is fixedly installed inside the guide frame (2). The positioning assembly (3) includes an upper collar (31) and a lower collar (32) fixedly installed inside the guide frame (2). A pre-clamping cleaning sleeve (33) is arranged between the upper collar (31) and the lower collar (32). The clamping assembly can clamp the pre-clamping cleaning sleeve (33). Rubber bristles are arranged on the inner wall of the pre-clamping cleaning sleeve (33). A plurality of groups of clamping inner cavities (39) are annularly arranged inside both the upper collar (31) and the lower collar (32). Buffer assemblies are arranged at the top of the upper collar (31) and the bottom of the lower collar (32). A top frame (4) is fixedly installed at the top of the guide frame (2). An infrared emitter (6), an infrared incident point indicating needle (5) and a receiver (7) are fixedly installed at the inner top of the top frame (4). The infrared incident point indicating needle (5) is located between the infrared emitter (6) and the receiver (7). Two groups of guide holes are opened inside both the upper collar (31) and the lower collar (32). A connecting guide post (34) is inserted into the guide holes. Locking screw holes are opened on the outer sides of both the upper collar (31) and the lower collar (32), and the locking screw holes penetrate through to the guide holes. A locking bolt (35) is threadedly connected inside the locking screw holes. A plurality of groups of wireless control solenoid valves (38) are fixedly installed at one end of both the upper collar (31) and the lower collar (32) close to the pre-clamping cleaning sleeve (33). The wireless control solenoid valves (38) are arranged corresponding to the clamping inner cavities (39). One end of the wireless control solenoid valve (38) is communicated with the clamping inner cavity (39), and the other end is connected with a connecting ring pipe (36). Two connecting heads (37) are arranged on the outer side of the connecting ring pipe (36) on the upper collar (31), and a single connecting head (37) is arranged on the outer side of the connecting ring pipe (36) on the lower collar (32). Pressure sensors are arranged inside the clamping inner cavities (39). The buffer assembly includes a buffer top plate (310) which is threadedly connected to the upper collar (31). A plurality of buffer cavities are opened inside the buffer top plate (310), and the buffer cavities are arranged corresponding to the clamping inner cavities (39). The buffer cavities are communicated with the clamping inner cavities (39). A buffer piston (311) is hermetically slidably connected inside the buffer cavity. A disk cover (312) is threadedly connected to the top of the buffer cavity. The buffer piston (311) penetrates through the disk cover (312). The tops of a plurality of buffer pistons (311) are fixedly connected to an adjusting ring (313) at the same time. An adjusting threaded hole is opened inside the adjusting ring (313). An adjusting screw (314) is rotatably installed at the top of the disk cover (312), and the adjusting screw (314) is threadedly connected in the adjusting threaded hole.

2. The sapphire crystal bar crystal axis detection and positioning device according to claim 1, wherein The clamping assembly includes a lifting cylinder (22) and a mounting slider (23). The lifting cylinder (22) is fixedly installed at the top of the guide frame (2). The mounting slider (23) is slidably connected in the guide frame (2). A clamping cylinder (24) is fixedly installed on one side of the mounting slider (23) away from the positioning assembly (3). A clamping plate (25) is fixedly installed at the telescopic end of the clamping cylinder (24).

3. The sapphire crystal bar crystal axis detection and positioning device according to claim 2, wherein A pinch roller is rotatably installed inside the clamping plate (25).

4. The sapphire crystal bar crystal axis detection and positioning device according to claim 3, wherein An installation plate (21) is arranged inside the guide frame (2). Connecting threaded holes are formed inside the installation plate (21). Installation threaded holes (315) are formed on the outer sides of the upper collar (31) and the lower collar (32).

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