Low-temperature tissue grinding instrument capable of conveniently and freely switching refrigerants

Abstract

The low-temperature tissue grinding instrument capable of conveniently and freely switching the refrigerants comprises a grinding disc which is provided with a disc-shaped structure and a grinding groove formed in the top of the grinding disc, one side of the grinding disc is fixedly connected with a grinding support, the top of the grinding support is fixedly connected with a driving motor, and the driving motor drives the grinding disc to rotate. A driving shaft of the driving motor penetrates through the grinding support and is fixedly connected with a grinding device, and the outer side of the grinding disc is sleeved with a protective sleeve. The grinding disc comprises a disc body, a cooling cavity is formed in the disc body, a lifting groove is formed in the bottom of the inner wall of the cooling cavity, a lifting table is fixedly connected to the inner wall of the lifting groove, and a heat dissipation inserting groove is formed in the top of the inner wall of the cooling cavity. According to the low-temperature tissue grinding instrument capable of conveniently and freely switching the refrigerants, the refrigerants entering the cooling cavity are replaced, so that the refrigerants are conveniently and freely replaced, and different grinding requirements are met.

Description

Technical Field

[0001] The invention relates to the technical field of grinding devices, and in particular to a low-temperature tissue grinding instrument capable of conveniently and freely switching refrigerants. Background Art

[0002] At present, many biological experiments require tissue processing before they are carried out, that is, the frozen tissue is ground and then lysate is added to extract protein or RNA. The grinding of the frozen tissue is done manually using a common mortar and pestle. However, unlike conventional grinding, in order to keep the tissue in a low temperature state, a refrigerant needs to be added to the mortar to cool it down, which can not only avoid RNA degradation, but also keep the tissue brittle and conducive to grinding. However, the grinding devices currently used can usually only use one refrigerant for cooling, which is not convenient to adapt to different grinding needs, and the grinding angle cannot be adjusted, and the grinding uniformity is poor. Summary of the invention

[0003] To achieve the above objectives, the present invention is implemented through the following technical solutions: a low-temperature tissue grinding instrument that is convenient for freely switching refrigerants, specifically comprising: A grinding disc, the grinding disc having a disc-shaped structure and a grinding groove arranged on the top of the grinding disc, a grinding bracket fixedly connected to one side of the grinding disc, a driving motor fixedly connected to the top of the grinding bracket, a driving shaft of the driving motor passing through the grinding bracket and fixedly connected to a grinding device, and a protective sleeve is arranged on the outer side of the grinding disc; The grinding disc comprises: A disk body, wherein a cooling cavity is arranged inside the disk body, and a lifting slot is arranged at the bottom of the inner wall of the cooling cavity, a lifting platform is fixedly connected to the inner wall of the lifting slot, and a heat dissipation slot is opened at the top of the inner wall of the cooling cavity; A lifting plate, the lifting plate having a disc-shaped structure, the lifting plate being arranged inside the cooling cavity and being slidably connected to the inner wall of the cooling cavity; Liquid inlet holes, which are provided in two groups and are respectively connected to the top and bottom of one side of the cooling cavity; The liquid outlet holes are provided in two groups and are respectively connected with the top and the bottom of one side of the cooling cavity away from the liquid inlet hole.

[0004] A grinding disc is provided. When grinding operation is performed inside the grinding groove, refrigerant can be discharged into the cooling cavity through the liquid inlet hole, and the disc body is cooled by the refrigerant inside the cooling cavity, thereby cooling the grinding groove on the top of the disc body and the grinding material inside. Since two groups of liquid inlet holes and liquid outlet holes are provided and are respectively connected to different refrigerant storage tanks, when the refrigerant needs to be replaced, the lifting plate is driven to move by the lifting platform, so that the lifting plate moves from the side of the lower liquid inlet hole to the side of the upper liquid inlet hole. At this time, the upper liquid inlet hole is blocked by the lifting plate, and the lower liquid inlet hole is released, so that the refrigerant entering the cooling cavity can be replaced, which is convenient and free to replace the refrigerant to meet different grinding needs.

[0005] Preferably, one side of the disc body is fixedly connected to the grinding bracket, the grinding groove is opened on the top of the disc body, and the lifting disc is made of heat-conducting material.

[0006] Preferably, the liquid inlet holes at the top and bottom of one side of the cooling cavity are connected to two different refrigerant storage tanks through connecting pipes respectively, and the lifting plate is made of heat-conducting material.

[0007] Preferably, the lifting plate has a disc body, a heat dissipation strip is fixedly connected to the top of the disc body, blocking blocks matching the liquid inlet and outlet are fixedly connected to both sides of the disc body, and heat-conducting grooves are provided on the top and bottom of the disc body.

[0008] Preferably, the disc body is arranged inside the cooling cavity and is slidably connected to the inner wall of the cooling cavity, the heat conducting grooves are provided in multiple groups and are evenly distributed on the disc body, and a lifting plate is provided. When the lifting plate moves upward, it drives the heat dissipation bar and the blocking block to move upward, and the upper liquid inlet hole is blocked by the blocking block, and at the same time, the heat dissipation bar is inserted into the heat dissipation slot, and the heat inside the grinding groove can be transferred to the heat dissipation bar through the heat dissipation slot, and the heat dissipation bar transfers the heat to the disc body, and heat is exchanged through the disc body and the refrigerant thereunder, thereby achieving heat dissipation, and the heat dissipation bar can be inserted into the heat dissipation slot below the grinding groove, and the cooperation of the heat dissipation slot and the heat dissipation bar can conveniently improve the heat dissipation efficiency, and the cooling effect is better. At the same time, heat conducting grooves are provided on the disc body, and the contact area between the disc body and the refrigerant can be increased through the heat conducting grooves, and the heat exchange efficiency is high.

[0009] Preferably, the heat dissipation strips are provided in multiple groups and are evenly distributed on the top of the disc body, the top of the heat dissipation strips extend into the heat dissipation slots and are slidably connected to the inner wall of the heat dissipation slots, and the width of the heat dissipation strips is smaller than the width of the inner wall of the heat dissipation slots.

[0010] Preferably, the grinding device includes a rotating sleeve, the inner wall of the rotating sleeve is fixedly connected to a telescopic push rod, the bottom of the rotating sleeve is connected to a conical cylinder, the bottom of the telescopic push rod is rotatably connected to a section of rod through a rotating bolt, the bottom of the section of rod passes through the conical cylinder and extends to the outside of the conical cylinder, the bottom of the section of rod is rotatably connected to a second section of rod through a rotating bolt, the bottom of the second section of rod is connected to a grinding head through a fixing device, and a grinding device is provided. During grinding, the telescopic push rod can be extended to drive the section of rod to move downward, and the section of rod can be squeezed while moving downward, so that the connection between the section of rod and the second section of rod is bent, and at the same time, the section of rod and the second section of rod are tilted, and the second section of rod drives the grinding head to rotate and deviate, so that the grinding part on the grinding head can change the grinding angle and grinding position, so that the grinding effect is better, and materials in different areas can be ground through different parts of the grinding head during the grinding process, and the grinding uniformity is better.

[0011] Preferably, the top of the rotating sleeve is fixedly connected to the driving shaft of the driving motor, and the grinding head extends into the grinding groove.

[0012] Preferably, the fixing device includes an arc-shaped plate, a threaded rod passing through the side of the arc-shaped plate and slidably connected, an arc-shaped pad is fixedly connected to the center position of the bottom of the arc-shaped plate, the threaded rods are provided in multiple groups and are evenly distributed on the arc-shaped plate, and a sealing ring is fixedly connected to the bottom edge of the arc-shaped plate.

[0013] Preferably, the center position of the top of the arc plate is fixedly connected to the bottom of the second-section rod, and a threaded groove matched with the threaded rod is opened on the top of the grinding head, and the bottom of the threaded rod extends to the inside of the threaded groove and is threadedly connected to the inner wall of the threaded groove. A fixing device is provided. When the grinding head needs to be replaced, the threaded rod is pulled out of the threaded groove, and a new grinding head is placed under the arc plate, and the threaded rod is inserted into the threaded groove on the new grinding head. The threaded rod can be rotated and the grinding head and the arc plate can be tightened by the threaded rod at the same time. The replacement operation is relatively convenient, and the grinding head continuously squeezes the arc pad and the sealing ring in the process of leaning against the arc plate. The elastic thrust of the arc pad and the sealing ring can make the threaded groove on the grinding head and the threaded rod tightly connected, so as to avoid the situation where the grinding head shakes and causes aggravated wear, thereby improving the stability of the grinding head and reducing the wear of the grinding head.

[0014] The present invention provides a low-temperature tissue grinding instrument that is convenient for freely switching refrigerants. It has the following beneficial effects: 1. A low-temperature tissue grinding instrument which is convenient for freely switching refrigerants is provided with a grinding disc. When grinding operation is performed inside the grinding groove, the refrigerant can be discharged into the cooling cavity through the liquid inlet hole, and the disc body is cooled by the refrigerant inside the cooling cavity, thereby cooling the grinding groove on the top of the disc body and the grinding material inside. Since two groups of liquid inlet holes and liquid outlet holes are provided and are respectively connected to different refrigerant storage tanks, when the refrigerant needs to be replaced, the lifting plate is driven to move by the lifting platform, so that the lifting plate moves from the side of the lower liquid inlet hole to the side of the upper liquid inlet hole. At this time, the upper liquid inlet hole is blocked by the lifting plate, and the lower liquid inlet hole is released, so that the refrigerant entering the cooling cavity can be replaced, which is convenient for freely replacing the refrigerant to meet different grinding needs.

[0015] 2. This is a low-temperature tissue grinding instrument that is convenient for freely switching refrigerants. It is provided with a lifting plate. When the lifting plate moves upward, it drives the heat dissipation strip and the blocking block to move upward, and the upper liquid inlet hole is blocked by the blocking block. At the same time, the heat dissipation strip is inserted into the heat dissipation slot, and the heat inside the grinding groove can be transferred to the heat dissipation strip through the heat dissipation slot. The heat dissipation strip transfers the heat to the disc body, and heat is exchanged between the disc body and the refrigerant below it, so as to achieve heat dissipation. The heat dissipation strip can be inserted into the heat dissipation slot below the grinding groove. Through the cooperation of the heat dissipation slot and the heat dissipation strip, the heat dissipation efficiency can be conveniently improved, and the cooling effect is better. At the same time, a heat-conducting groove is provided on the disc body, and the contact area between the disc body and the refrigerant can be increased through the heat-conducting groove, and the heat exchange efficiency is high.

[0016] 3. This low-temperature tissue grinding instrument, which is convenient for freely switching refrigerants, is provided with a grinding device. During grinding, the telescopic push rod can be extended to drive one section of the rod to move downward. While the one section of the rod moves downward, the second section of the rod is squeezed to bend the connection between the one section of the rod and the second section of the rod. At the same time, the one section of the rod and the second section of the rod are tilted. The second section of the rod drives the grinding head to rotate and offset, so that the grinding part on the grinding head can change the grinding angle and grinding position, so that the grinding effect is better. Materials in different areas can be ground through different parts of the grinding head during the grinding process, and the grinding uniformity is better.

[0017] 4. A low-temperature tissue grinding instrument that is convenient for freely switching refrigerants is provided with a fixing device. When the grinding head needs to be replaced, the threaded rod is pulled out of the threaded groove, the new grinding head is placed under the arc plate, the threaded rod is inserted into the threaded groove on the new grinding head, and the threaded rod is rotated while tightening the grinding head and the arc plate through the threaded rod. The replacement operation is relatively convenient, and the grinding head continuously squeezes the arc pad and the sealing ring in the process of leaning against the arc plate. The elastic thrust of the arc pad and the sealing ring can tightly connect the threaded groove on the grinding head and the threaded rod, thereby avoiding the situation where the grinding head shakes and causes aggravated wear, thereby facilitating improving the stability of the grinding head and reducing the wear of the grinding head. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the grinding disc of the present invention; Figure 3 It is a schematic diagram of the cross-sectional structure of the grinding disc of the present invention; Figure 4 This is a schematic diagram of the lifting plate structure of the present invention; Figure 5 It is a schematic diagram of the structure of the grinding device of the present invention; Figure 6 This is a schematic diagram of the internal structure of the rotating sleeve of the present invention; Figure 7 It is a schematic diagram of the connection structure of the fixing device of the present invention; Figure 8 It is a schematic diagram of the internal structure of the fixing device of the present invention; Fig. 9 It is a schematic diagram of the exploded structure of the fixing device of the present invention.

[0019] In the figure: 1. grinding disc; 11. disc body; 12. lifting groove; 13. lifting platform; 14. heat dissipation slot; 15. lifting disc; 151. disc body; 152. heat dissipation strip; 153. blocking block; 154. heat conduction groove; 17. liquid inlet hole; 18. liquid outlet hole; 19. cooling cavity; 2. grinding groove; 3. grinding bracket; 4. driving motor; 9. grinding device; 91. rotating sleeve; 92. telescopic push rod; 93. conical cylinder; 94. one-stage rod; 95. two-stage rod; 96. grinding head; 97. fixing device; 971. arc plate; 972. threaded rod; 973. arc pad; 974. threaded groove; 975. sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Example

[0021] See also Figure 1-Figure 3 The present invention provides a technical solution: a low-temperature tissue grinding instrument that is convenient for freely switching refrigerants, specifically comprising: A grinding disc 1, which has a disc-shaped structure and a grinding groove 2 arranged on the top of the grinding disc 1, a grinding bracket 3 is fixedly connected to one side of the grinding disc 1, a driving motor 4 is fixedly connected to the top of the grinding bracket 3, a driving shaft of the driving motor 4 passes through the grinding bracket 3 and is fixedly connected to a grinding device 9, and a protective sleeve is provided on the outer side of the grinding disc 1; The grinding disc 1 comprises: A disk body 11, wherein a cooling cavity 19 is provided inside the disk body 11, and a lifting slot 12 is provided at the bottom of the inner wall of the cooling cavity 19, a lifting platform 13 is fixedly connected to the inner wall of the lifting slot 12, and a heat dissipation slot 14 is provided at the top of the inner wall of the cooling cavity 19; A lifting plate 15, which has a disc-shaped structure, is disposed inside the cooling cavity 19 and is slidably connected to the inner wall of the cooling cavity 19; Liquid inlet holes 17, which are provided in two groups and are respectively connected to the top and bottom of one side of the cooling cavity 19; The liquid outlet holes 18 are provided in two groups and are respectively connected with the top and the bottom of the cooling cavity 19 on one side away from the liquid inlet hole 17 .

[0022] One side of the disc body 11 is fixedly connected to the grinding bracket 3 , and the grinding groove 2 is opened on the top of the disc body 11 .

[0023] The liquid inlet holes 17 at the top and bottom of one side of the cooling cavity 19 are connected to two different refrigerant storage tanks through connecting pipes respectively, and the lifting plate 15 is made of heat-conducting material.

[0024] A grinding disc 1 is provided. When grinding operation is performed inside the grinding groove 2, the refrigerant can be discharged into the cooling cavity 19 through the liquid inlet hole 17, and the refrigerant inside the cooling cavity 19 is used to cool the disc body 11, thereby cooling the grinding groove 2 on the top of the disc body 11 and the grinding material inside. Since the liquid inlet hole 17 and the liquid outlet hole 18 are provided with two groups and are respectively connected to different refrigerant storage tanks, when the refrigerant needs to be replaced, the lifting platform 13 drives the lifting disc 15 to move, so that the lifting disc 15 moves from the side of the lower liquid inlet hole 17 to the side of the upper liquid inlet hole 17. At this time, the upper liquid inlet hole 17 is blocked by the lifting disc 15, and the lower liquid inlet hole 17 is released, so that the refrigerant entering the cooling cavity 19 can be replaced, which is convenient for free replacement of the refrigerant to meet different grinding needs. Example

[0025] See also Figure 1-Figure 4On the basis of the first embodiment, the present invention provides a technical solution: the lifting plate 15 has a disc body 151, a heat dissipation bar 152 is fixedly connected to the top of the disc body 151, and blocks 153 adapted to the liquid inlet hole 17 and the liquid outlet hole 18 are fixedly connected on both sides of the disc body 151, and heat conduction grooves 154 are provided on the top and bottom of the disc body 151. The disc body 151 is arranged inside the cooling cavity 19 and is slidably connected to the inner wall of the cooling cavity 19. The heat conduction grooves 154 are provided in multiple groups and are evenly distributed on the disc body 151. The heat dissipation bar 152 is provided in multiple groups and is evenly distributed on the top of the disc body 151. The top of the heat dissipation bar 152 extends to the inside of the heat dissipation slot 14 and is slidably connected to the inner wall of the heat dissipation slot 14. The width of the heat dissipation bar 152 is smaller than the width of the inner wall of the heat dissipation slot 14. The lowering plate 15, when the lifting plate 15 moves upward, the heat sink 152 and the blocking block 153 are driven to move upward, and the upper liquid inlet 17 is blocked by the blocking block 153. At the same time, the heat sink 152 is inserted into the heat sink slot 14, and the heat inside the grinding groove 2 can be transferred to the heat sink 152 through the heat sink slot 14. The heat sink 152 transfers the heat to the disc body 151, and the disc body 151 exchanges heat with the refrigerant thereunder, so as to achieve heat dissipation. The heat sink 152 can be inserted into the heat sink slot 14 below the grinding groove 2. Through the cooperation of the heat sink slot 14 and the heat sink 152, the heat dissipation efficiency can be improved conveniently, and the cooling effect is better. At the same time, a heat conducting groove 154 is provided on the disc body 151, and the contact area between the disc body 151 and the refrigerant can be increased through the heat conducting groove 154, and the heat exchange efficiency is higher. Example

[0026] See also Figure 1-Figure 6On the basis of the first and second embodiments, the present invention provides a technical solution: the grinding device 9 includes a rotating sleeve 91, the inner wall of the rotating sleeve 91 is fixedly connected with a telescopic push rod 92, the bottom of the rotating sleeve 91 is connected with a conical cylinder 93, the bottom of the telescopic push rod 92 is rotatably connected with a section rod 94 through a rotating bolt, the bottom of the section rod 94 passes through the conical cylinder 93 and extends to the outside of the conical cylinder 93, the bottom of the section rod 94 is rotatably connected with a second section rod 95 through a rotating bolt, the bottom of the second section rod 95 is connected with a grinding head 96 through a fixing device 97, the top of the rotating sleeve 91 is fixedly connected to the driving shaft of the driving motor 4, and the grinding head 96 A grinding device 9 is provided extending into the grinding tank 2. During grinding, the telescopic push rod 92 can be extended to drive the first section rod 94 to move downward. The first section rod 94 squeezes the second section rod 95 while moving downward, so that the connection between the first section rod 94 and the second section rod 95 is bent. At the same time, the first section rod 94 and the second section rod 95 are tilted, and the second section rod 95 drives the grinding head 96 to rotate and offset, so that the grinding part on the grinding head 96 can change the grinding angle and grinding position, so that the grinding effect is better. Materials in different areas can be ground through different parts of the grinding head 96 during the grinding process, and the grinding uniformity is better. Example

[0027] See also Figure 1-Figure 9 On the basis of the first, second and third embodiments, the present invention provides a technical solution: the fixing device 97 comprises an arc plate 971, a threaded rod 972 is penetrated through the side of the arc plate 971 and slidably connected, an arc pad 973 is fixedly connected at the bottom center of the arc plate 971, a plurality of groups of threaded rods 972 are arranged and evenly distributed on the arc plate 971, a sealing ring 975 is fixedly connected to the bottom edge of the arc plate 971, the top center of the arc plate 971 is fixedly connected to the bottom of the second-stage rod 95, a threaded groove 974 adapted to the threaded rod 972 is opened at the top of the grinding head 96, the bottom of the threaded rod 972 extends to the inside of the threaded groove 974 and is threadedly connected to the inner wall of the threaded groove 974, and a fixing device 97 is provided, when the grinding head needs to be replaced 96, pull out the threaded rod 972 from the threaded groove 974, place the new grinding head 96 under the arc plate 971, insert the threaded rod 972 into the threaded groove 974 on the new grinding head 96, and rotate the threaded rod 972 while tightening the grinding head 96 and the arc plate 971 through the threaded rod 972. The replacement operation is relatively convenient, and the grinding head 96 continuously squeezes the arc pad 973 and the sealing ring 975 in the process of leaning against the arc plate 971. The elastic thrust of the arc pad 973 and the sealing ring 975 can make the threaded groove 974 on the grinding head 96 and the threaded rod 972 tightly connected, so as to avoid the shaking of the grinding head 96 and cause aggravated wear, thereby improving the stability of the grinding head 96 and reducing the wear of the grinding head.

[0028] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A low-temperature tissue grinding instrument that is convenient for freely switching refrigerants, specifically comprising: A grinding disc (1), the grinding disc (1) having a disc-shaped structure, and a grinding groove (2) arranged on the top of the grinding disc (1), a grinding bracket (3) being fixedly connected to one side of the grinding disc (1), a driving motor (4) being fixedly connected to the top of the grinding bracket (3), a driving shaft of the driving motor (4) passing through the grinding bracket (3) and being fixedly connected to a grinding device (9), and a protective sleeve being provided on the outer side of the grinding disc (1); The low-temperature tissue grinding instrument that is convenient for freely switching refrigerants is characterized in that the grinding disc (1) comprises: A disk body (11), wherein a cooling cavity (19) is arranged inside the disk body (11), and a lifting groove (12) is arranged at the bottom of the inner wall of the cooling cavity (19), a lifting platform (13) is fixedly connected to the inner wall of the lifting groove (12), and a heat dissipation slot (14) is opened at the top of the inner wall of the cooling cavity (19); A lifting plate (15), the lifting plate (15) having a disc-shaped structure, the lifting plate (15) being arranged inside the cooling cavity (19) and being slidably connected to the inner wall of the cooling cavity (19); Liquid inlet holes (17), the liquid inlet holes (17) being provided in two groups and respectively connected to the top and bottom of one side of the cooling cavity (19); Liquid outlet holes (18) are provided in two groups and are respectively connected to the top and the bottom of a side of the cooling cavity (19) away from the liquid inlet hole (17).

2. A low-temperature tissue grinding instrument that is convenient for freely switching refrigerants according to claim 1, characterized in that: One side of the disc body (11) is fixedly connected to the grinding bracket (3), the grinding groove (2) is opened on the top of the disc body (11), and the lifting disc (15) is made of heat-conducting material.

3. The low-temperature tissue grinding instrument with convenient and free switching of refrigerants according to claim 1, characterized in that: The liquid inlet holes (17) at the top and bottom of one side of the cooling cavity (19) are respectively connected to two different refrigerant storage tanks via connecting pipes, and the lifting plate (15) is made of heat-conducting material.

4. The low-temperature tissue grinding instrument with convenient and free switching of refrigerants according to claim 1, characterized in that: The lifting plate (15) comprises a disc body (151), a heat dissipation strip (152) being fixedly connected to the top of the disc body (151), blocking blocks (153) matching the liquid inlet hole (17) and the liquid outlet hole (18) being fixedly connected to both sides of the disc body (151), and heat conduction grooves (154) being provided at the top and bottom of the disc body (151).

5. A low-temperature tissue grinding instrument that is convenient for freely switching refrigerants according to claim 4, characterized in that: The disc body (151) is arranged inside the cooling cavity (19) and is slidably connected to the inner wall of the cooling cavity (19); a plurality of groups of heat-conducting grooves (154) are arranged and are evenly distributed on the disc body (151).

6. The low-temperature tissue grinding instrument with convenient and free switching of refrigerants according to claim 4, characterized in that: The heat dissipation bars (152) are arranged in multiple groups and are evenly distributed on the top of the disc body (151); the top of the heat dissipation bars (152) extends into the interior of the heat dissipation slot (14) and is slidably connected to the inner wall of the heat dissipation slot (14); the width of the heat dissipation bars (152) is smaller than the width of the inner wall of the heat dissipation slot (14).

7. The low-temperature tissue grinding instrument with convenient and free switching of refrigerants according to claim 1, characterized in that: The grinding device (9) comprises a rotating sleeve (91), the inner wall of which is fixedly connected to a telescopic push rod (92), the bottom of which is connected to a conical cylinder (93), the bottom of which is rotatably connected to a section rod (94) via a rotating bolt, the bottom of which passes through the conical cylinder (93) and extends to the outside of the conical cylinder (93), the bottom of which is rotatably connected to a second section rod (95) via a rotating bolt, and the bottom of which is connected to a grinding head (96) via a fixing device (97).

8. The low-temperature tissue grinding instrument with convenient and free switching of refrigerants according to claim 7, characterized in that: The top of the rotating sleeve (91) is fixedly connected to the driving shaft of the driving motor (4), and the grinding head (96) extends into the interior of the grinding groove (2).

9. The low-temperature tissue grinding instrument with convenient and free switching of refrigerants according to claim 7, characterized in that: The fixing device (97) comprises an arc-shaped plate (971), a threaded rod (972) passing through the side of the arc-shaped plate (971) and being slidably connected, an arc-shaped pad (973) being fixedly connected at the center of the bottom of the arc-shaped plate (971), a plurality of groups of threaded rods (972) being arranged and evenly distributed on the arc-shaped plate (971), and a sealing ring (975) being fixedly connected to the bottom edge of the arc-shaped plate (971).

10. The low-temperature tissue grinding instrument with convenient and free switching of refrigerants according to claim 9, characterized in that: The center position of the top of the arc-shaped plate (971) is fixedly connected to the bottom of the second-section rod (95); the top of the grinding head (96) is provided with a thread groove (974) adapted to the threaded rod (972); the bottom of the threaded rod (972) extends into the inside of the thread groove (974) and is threadedly connected to the inner wall of the thread groove (974).

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