A non-contact cavitation cleaning pump for brittle optical crystals

By fixing the piston pump and supporting cavitation nozzle on the workbench, the problem of space occupied and high-strength operation of the brittle optical crystal cavitation cleaning pump is solved, and convenient operation and low-strength operation are achieved.

CN120292062BActive Publication Date: 2025-08-15FUZHOU HG OPTRONICS INC
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Patent Information

Application Number
CN202510778541.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-06-11
Publication Date
2025-08-15
Estimated Expiration
2045-06-11

AI Technical Summary

Technical Problem

The existing brittle optical crystal cavitation cleaning pump occupies the space around the workbench, hindering the operation of the worker and holding the cavitation nozzle for a long time increases the working strength.

Method used

A brittle optical crystal non-contact cavitation cleaning pump is designed. By setting a positioning plate and a positioning angle plate on the workbench, the piston pump is hidden and fixed with a slide rod and a locking member, and the cavitation nozzle is supported by the support nozzle to reduce hand-held operation.

Benefits of technology

It effectively avoids the piston pump occupying the workbench space, simplifies the operation process, reduces the working intensity, and improves work efficiency.

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Abstract

The present invention relates to the field of pumps, and in particular to a non-contact cavitation cleaning pump for brittle optical crystals, comprising a piston pump, a pump frame being provided in front of the piston pump, both ends of the pump frame being horizontally fixedly mounted with horizontal positioning plates, both ends of the pump frame being obliquely fixedly mounted with positioning angle plates, the two positioning angle plates being symmetrically arranged, the inclination of the positioning angle plates being adapted to the inclination of the reinforcing frame of the workbench, the horizontal positioning plates being located above the positioning angle plates, two sliding rods being symmetrically slidably mounted in the middle of the pump frame, a locking member being provided between the sliding rods and the pump frame, and the rear ends of the two sliding rods being inlaid with connecting frames. The present invention avoids the piston pump occupying space around the workbench, effectively facilitates the work of the staff, is convenient to use, reduces the intensity of the work, and meets the work requirements.
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Description

Technical Field

[0001] The present invention relates to the field of pumps, and in particular to a non-contact cavitation cleaning pump for fragile optical crystals. Background Art

[0002] The cavitation cleaning pump uses a piston pump as its main body to spray liquid. When the liquid flows through the cavitation nozzle, a local low-pressure area is formed due to the sudden contraction of the cross-section or the change of the flow channel structure, thereby generating a large number of cavitation bubbles. The cavitation effect generated, that is, the energy impact generated by the formation and collapse of cavitation bubbles, is used to peel off dirt. During the whole process, there is no direct contact between the liquid and the surface of the object being cleaned. Because this method will not damage the workpiece, it is often used to operate on fragile optical crystals.

[0003] However, in actual use, the piston pump is mostly placed on the ground around the workbench. This method causes the piston pump to occupy the space around the workbench, hindering the workers from walking around the workbench, which is not conducive to the workers' work. In addition, during use, the workers mostly hold the cavitation nozzle for a long time to operate, which increases the intensity of the work. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the background technology and to propose a non-contact cavitation cleaning pump for fragile optical crystals.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: a non-contact cavitation cleaning pump for brittle optical crystals, including a piston pump, a pump frame is provided in front of the piston pump, both ends of the pump frame are horizontally fixed with horizontal positioning plates, both ends of the pump frame are obliquely fixed with positioning angle plates, the two positioning angle plates are symmetrically arranged, the inclination of the positioning angle plates is adapted to the inclination of the reinforcement frame of the workbench, the horizontal positioning plate is located above the positioning angle plate, and two sliding rods are symmetrically slidably installed in the middle of the pump frame, and the sliding rods are connected to the pump frame. A locking piece is provided between the two sliding rods, and the rear ends of the two sliding rods are inlaid with connecting frames. The piston pump is connected to the two connecting frames. Two groove frames are symmetrically extended from the lower end of the pump frame. The ends of the groove frames are rotatably installed with a locking shaft. The outer surface of the locking shaft is inlaid with a vertical locking frame. The end of the locking shaft is extended with an axis groove claw. A connecting lock frame is connected between the axis groove claw and the connecting frame. The outlet end of the piston pump is fixedly connected to a hose through a flange, and the end of the hose is fixedly connected to a cavitation nozzle. A nozzle piece for supporting the cavitation nozzle is provided on the pump frame.

[0006] Preferably, a pump seat is fixedly installed between the lower edges of the opposite surfaces of the two connecting frames, and the piston pump is fixed to the upper end of the pump seat by bolts. The opposite surfaces of the two connecting frames are extended with protruding edges near the middle, and the ends of the protruding edges are penetrated and embedded with push seats, and the connecting lock frame is connected to the push seat.

[0007] Preferably, both ends of the connecting lock frame are penetrated by shaft columns for rotational installation, one of the shaft columns is embedded in the end of the shaft groove claw, and the other shaft column is embedded in the end of the push seat, and the inlet end of the piston pump is fixedly connected to the water inlet pipe through a flange.

[0008] Preferably, the locking member includes a synchronous frame embedded between the front ends of the two sliding rods, a frame seat extends from the middle of the upper end of the pump frame, a pin shaft is rotatably installed inside the frame seat, a Z-shaped lock frame is rotatably installed on the outer surface of the pin shaft, the lower end of the Z-shaped lock frame is pressed against the front end of the synchronous frame, a top spring seat extends from the middle of the rear end of the pump frame, a locking spring is fixedly installed on the end of the top spring seat, and the end of the locking spring is fixed to the rear end of the Z-shaped lock frame.

[0009] Preferably, the front lower edge of the Z-shaped lock frame is inclined, and a bevel groove is provided at the upper rear edge of the synchronization frame, and the bevel groove is aligned with the Z-shaped lock frame. A top frame claw is obliquely extended at the front lower edge of the frame seat, and the top frame claw is pressed against the lower end of the Z-shaped lock frame.

[0010] Preferably, the nozzle member includes a nozzle frame fixedly mounted on the upper end of the pump frame near the edge, a ball support seat is fixedly mounted on the end of the nozzle frame, an adaptable ball is coaxially inlaid on the outer surface of the cavitation nozzle, a ball pressure cover is provided on the upper end of the ball support seat, and the ball pressure cover and the ball support seat are clamped on the outer surface of the adaptable ball.

[0011] Preferably, a door frame extends from the upper end of the ball supporting seat, and the ball pressing cover is slidably installed inside the door frame.

[0012] Preferably, a threaded column is screwed through the middle of the upper end of the door frame, the lower end of the threaded column is rotatably connected to the middle of the upper end of the pressure ball cover, and a handwheel is coaxially fixedly installed on the upper end of the threaded column.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Place the pump stand on the workbench. At this time, the two horizontal positioning plates are placed on the lower end of the workbench desktop, and the two positioning angle plates are engaged with the two reinforcing frames of the workbench for positioning, and the piston pump is supported. Then, the piston pump is pushed toward the inside of the workbench. At this time, the slide rod slides on the pump stand for guidance, and the connecting frame drives the connecting lock frame to move synchronously to pull the shaft groove claw to make the vertical lock frame on the lock shaft stand up to press against the rear end of the reinforcing frame, so as to hide and fix the piston pump inside the workbench, avoiding the piston pump occupying the space around the workbench, so as to facilitate the staff to work. At the same time, when the vertical lock frame stands up and presses against the rear end of the reinforcing frame, the Z-shaped lock frame will automatically press on the front end of the synchronous frame under the push of the locking spring, so that the upright vertical lock frame is locked, and then the piston pump is firmly fixed. The process only requires pushing the piston pump to complete the hidden fixation of the piston pump. The operation is simple and effective.

[0015] 2. The nozzle support frame can support the cavitation nozzle to replace the workers holding the cavitation nozzle for a long time, thereby reducing the work intensity. By rotating the threaded column, the pressure ball cover can be driven to slide upward in the door frame, thereby loosening the clamping of the adaptive ball. Then, the cavitation nozzle can be swung with the adaptive ball as the center to flexibly adjust the working angle of the cavitation nozzle or remove the cavitation nozzle and operate it by hand, so as to meet the needs of the operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of a non-contact cavitation cleaning pump for brittle optical crystals according to the present invention;

[0017] Figure 2 A schematic diagram of a non-contact cavitation cleaning pump for brittle optical crystals according to the present invention from another perspective;

[0018] Figure 3 This is a schematic diagram of a cavitation nozzle of a non-contact cavitation cleaning pump for brittle optical crystals according to the present invention;

[0019] Figure 4 This is a schematic diagram of a sliding rod of a non-contact cavitation cleaning pump for brittle optical crystals according to the present invention;

[0020] Figure 5 The present invention is a non-contact cavitation cleaning pump for fragile optical crystals Figure 4 A magnified view of middle A;

[0021] Figure 6 This is a schematic diagram of a locking spring of a non-contact cavitation cleaning pump for brittle optical crystals according to the present invention;

[0022] Figure 7 This is a diagram showing the use of a non-contact cavitation cleaning pump for fragile optical crystals according to the present invention;

[0023] Figure 8 This is a schematic diagram of a reinforcement frame of a non-contact cavitation cleaning pump for brittle optical crystals according to the present invention;

[0024] Figure 9 This is a schematic diagram from another perspective of the reinforcement frame of a non-contact cavitation cleaning pump for brittle optical crystals of the present invention.

[0025] In the figure: 1. Piston pump; 2. Pump frame; 3. Z-shaped lock frame; 4. Slide rod; 5. Vertical lock frame; 6. Water inlet pipe; 7. Hose; 8. Nozzle support frame; 9. Cavitation nozzle; 10. Horizontal positioning plate; 11. Positioning angle plate; 12. Pump seat; 13. Connecting frame; 14. Inclined groove; 15. Top frame claw; 16. Frame seat; 17. Pin; 18. Locking spring; 19. Top spring seat; 20. Synchronous frame; 21. Adaptive ball; 22. Pressure ball cover; 23. Ball support seat; 24. Door frame; 25. Threaded column; 26. Grooved frame; 27. Extending edge; 28. Lock shaft; 29. Shaft groove claw; 30. Connecting lock frame; 31. Push seat; 32. Handwheel; 33. Shaft column; 34. Workbench; 35. Reinforcement frame. DETAILED DESCRIPTION

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are merely examples, and those skilled in the art may conceive of other obvious variations.

[0027] like Figures 1-9The non-contact cavitation cleaning pump for brittle optical crystals shown in the figure includes a piston pump 1. A pump frame 2 is provided in front of the piston pump 1. Horizontal positioning plates 10 are fixedly installed horizontally at both ends of the pump frame 2. Positioning angle plates 11 are fixedly installed at both ends of the pump frame 2 at an angle. The pump frame 2 plays a role in supporting the horizontal positioning plates 10 and the positioning angle plates 11. The two positioning angle plates 11 are symmetrically arranged to adapt to the distribution of the two reinforcing frames 35 on the same side. The inclination of the positioning angle plates 11 is consistent with the reinforcement frame 34 of the workbench. 5 is adapted to ensure that the positioning angle plate 11 and the reinforcement frame 35 are fully engaged. The horizontal positioning plate 10 is located above the positioning angle plate 11. Two slide bars 4 are symmetrically slidably installed in the middle of the pump frame 2. A locking member is provided between the slide bar 4 and the pump frame 2. The slide bar 4 plays a guiding role. The rear ends of the two slide bars 4 are inlaid with a connecting frame 13. The piston pump 1 is connected to the two connecting frames 13. The connecting frame 13 plays a connecting role. The lower end of the pump frame 2 symmetrically extends with two grooved frames 26. The grooved frame 2 The end of the lock shaft 28 is rotatably installed through the end of the lock shaft 28, and the groove frame 26 plays the role of carrying the lock shaft 28. The outer surface of the lock shaft 28 is inlaid with a vertical lock frame 5. The lock shaft 28 can drive the vertical lock frame 5 to stand up to support the reinforcement frame 35. The L-shaped design of the positioning angle plate 11 can cooperate with the vertical lock frame 5 to hold the reinforcement frame 35 tightly to fix the piston pump 1. The end of the lock shaft 28 is extended with a shaft groove claw 29. The shaft groove claw 29 is connected to the connecting frame 13 with a connecting lock frame 30. The connecting lock frame 30 can The shaft groove claw 29 is driven by the movable connecting frame 13 to move, thereby driving the lock shaft 28 to rotate, and allowing the vertical lock frame 5 to stand up. The outlet end of the piston pump 1 is fixedly connected to the hose 7 through a flange, and the end of the hose 7 is fixedly connected to the cavitation nozzle 9. The piston pump 1 sprays the liquid and forms cavitation bubbles through the cavitation nozzle 9 at the end of the hose 7. Because this operation is a prior art and has been widely used, it is not elaborated here. A nozzle support for supporting the cavitation nozzle 9 is provided on the pump frame 2.

[0028] A pump seat 12 is fixedly installed between the lower edges of the opposite surfaces of the two connecting frames 13. The piston pump 1 is fixed to the upper end of the pump seat 12 by bolts. The pump seat 12 serves to support the piston pump 1. An extended edge 27 is extended from the opposite sides of the two connecting frames 13 near the middle. The end of the extended edge 27 is penetrated and inlaid with a push seat 31. The extended edge 27 serves to fix the push seat 31. The connecting lock frame 30 is connected to the push seat 31, and the push seat 31 serves to connect the connecting lock frame 30 to the connecting frame 13.

[0029] Both ends of the connecting lock frame 30 are rotatably installed with shaft columns 33, one of which is embedded in the end of the shaft groove claw 29, and the other is embedded in the end of the push seat 31. The shaft columns 33 serve to facilitate the connection between the connecting lock frame 30 and the shaft groove claw 29 and the push seat 31. The inlet end of the piston pump 1 is fixedly connected to the water inlet pipe 6 through a flange.

[0030] The locking member includes a synchronous frame 20 embedded between the front ends of the two slide bars 4, and the synchronous frame 20 plays the role of being locked by the Z-shaped lock frame 3. A frame seat 16 is extended from the middle part of the upper end of the pump frame 2, and a pin 17 is rotatably installed inside the frame seat 16. The frame seat 16 plays the role of bearing the pin 17. The outer surface of the pin 17 is rotatably installed with the Z-shaped lock frame 3, and the pin 17 plays the role of allowing the Z-shaped lock frame 3 to flip over. The lower end of the Z-shaped lock frame 3 is pressed against the front end of the synchronous frame 20, and a top spring seat 19 is extended from the middle part of the rear end of the pump frame 2. The end of the top spring seat 19 is fixedly installed with a locking spring 18. The top spring seat 19 plays the role of bearing the locking spring 18. The end of the locking spring 18 is fixed to the rear end of the Z-shaped lock frame 3, and the locking spring 18 restores the deformation to drive the Z-shaped lock frame 3 to flip down and press itself on the front end of the synchronous frame 20, so that the upright lock frame 5 is locked, thereby firmly fixing the piston pump 1.

[0031] The front lower edge of the Z-shaped lock frame 3 is inclined, and a bevel groove 14 is provided at the upper rear edge of the synchronous frame 20. The bevel groove 14 cooperates with the inclined portion on the Z-shaped lock frame 3, so that the synchronous frame 20 can lift the Z-shaped lock frame 3 when moving, so that the Z-shaped lock frame 3 is flipped up with the pin 17 as the center, and the bevel groove 14 is aligned with the Z-shaped lock frame 3. A top frame claw 15 is extended obliquely at the front lower edge of the frame seat 16, and the top frame claw 15 is pressed against the lower end of the Z-shaped lock frame 3. The top frame claw 15 can position the Z-shaped lock frame 3 so that the Z-shaped lock frame 3 pushed by the locking spring 18 can maintain a horizontal state.

[0032] The nozzle support member includes a nozzle support frame 8 fixedly installed at the upper end of the pump frame 2 near the edge, and a ball support seat 23 is fixedly installed at the end of the nozzle support frame 8. The nozzle support frame 8 plays a role in supporting the cavitation nozzle 9, thereby replacing the staff's long-term hand-holding of the cavitation nozzle 9 to reduce the intensity of the work. The outer surface of the cavitation nozzle 9 is coaxially inlaid with an adaptation ball 21, and the upper end of the ball support seat 23 is provided with a ball pressing cover 22. The ball pressing cover 22 and the ball support seat 23 are clamped on the outer surface of the adaptation ball 21. The ball pressing cover 22 and the ball support seat 23 can clamp and fix the adaptation ball 21, thereby fixing the cavitation nozzle 9.

[0033] A door frame 24 extends from the upper end of the ball supporting seat 23 , and the ball pressing cover 22 is slidably installed inside the door frame 24 . The door frame 24 serves to guide the ball pressing cover 22 .

[0034] A threaded column 25 is screwed through the middle of the upper end of the door frame 24, and the lower end of the threaded column 25 is rotatably connected to the middle of the upper end of the pressure ball cover 22. The threaded column 25 is rotated to drive the pressure ball cover 22 to slide upward in the door frame 24, thereby loosening the clamping of the adaptation ball 21. The cavitation nozzle 9 is then swung around the adaptation ball 21 to flexibly adjust the operating angle of the cavitation nozzle 9 or remove the cavitation nozzle 9 and change it to hand-held operation to meet the needs of the operation. A handwheel 32 is coaxially fixedly mounted on the upper end of the threaded column 25, and the handwheel 32 serves to facilitate the rotation of the threaded column 25.

[0035] When in use, the pump stand 2 is placed on the workbench 34. At this time, the two horizontal positioning plates 10 are placed on the lower end of the table top of the workbench 34, and the two positioning angle plates 11 are engaged with the two reinforcing frames 35 of the workbench 34 for positioning, and the piston pump 1 is supported. Then, the piston pump 1 is pushed toward the inside of the workbench 34. At this time, the slide rod 4 slides on the pump stand 2 for guidance, and the connecting frame 13 drives the connecting lock frame 30 to move synchronously to pull the shaft groove claw 29, so that the lock shaft 28 is locked. The vertical lock frame 5 stands up to press against the rear end of the reinforcement frame 35. During this process, the synchronous frame 20 will move synchronously and push up the Z-shaped lock frame 3 under the action of the inclined groove 14, so that the Z-shaped lock frame 3 turns up with the pin 17 as the center. When the vertical lock frame 5 stands up to press against the rear end of the reinforcement frame 35, the synchronous frame 20 just moves to the rear of the Z-shaped lock frame 3. At this time, the locking spring 18 recovers its deformation to drive the Z-shaped lock frame 3 to turn down and press on the front end of the synchronous frame 20, so that the vertical lock frame 5 is Lock, and then firmly fix the piston pump 1, so as to hide and fix the piston pump 1 inside the workbench 34, avoid the piston pump 1 occupying the space around the workbench 34, so as to facilitate the staff to move around and work, and then place the water inlet pipe 6 in the water source, and then the piston pump 1 can be used to spray the liquid, and form cavitation bubbles through the cavitation nozzle 9 at the end of the hose 7 to operate on the brittle optical crystal on the workbench 34. During this process, the nozzle holder 8 will support the cavitation nozzle 9 to replace the staff holding the cavitation nozzle 9 for a long time to reduce the work intensity. When the working angle of the cavitation nozzle 9 cannot meet the requirements, the threaded column 25 can be rotated to drive the pressure ball cover 22 to slide upward in the door frame 24, thereby loosening the clamping of the adaptation ball 21, and then the cavitation nozzle 9 is swung with the adaptation ball 21 as the center to flexibly adjust the working angle of the cavitation nozzle 9 or remove the cavitation nozzle 9 and change it to hand-held operation to meet the work requirements.

[0036] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions merely illustrate the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A non-contact cavitation cleaning pump for fragile optical crystals, comprising a piston pump (1), characterized in that: A pump frame (2) is provided in front of the piston pump (1), and horizontal positioning plates (10) are fixedly installed at both ends of the pump frame (2) in a horizontal manner. Positioning angle plates (11) are fixedly installed at both ends of the pump frame (2) in an inclined manner. The two positioning angle plates (11) are symmetrically arranged, and the inclination of the positioning angle plates (11) is adapted to the inclination of the reinforcing frame of the workbench. The horizontal positioning plate (10) is located above the positioning angle plates (11). Two sliding rods (4) are symmetrically slidably installed in the middle of the pump frame (2), and a locking member is provided between the sliding rod (4) and the pump frame (2). The rear ends of the two sliding rods (4) are inlaid with a connecting frame (13). The piston pump (1) is connected to two connecting frames (13), and two grooved frames (26) are symmetrically extended from the lower end of the pump frame (2), and a lock shaft (28) is rotatably installed through the end of the grooved frame (26), and the outer surface of the lock shaft (28) is inlaid with a vertical lock frame (5), and an axis groove claw (29) extends from the end of the lock shaft (28), and a connecting lock frame (30) is connected between the axis groove claw (29) and the connecting frame (13). The outlet end of the piston pump (1) is fixedly connected to a hose (7) through a flange, and the end of the hose (7) is fixedly connected to a cavitation nozzle (9), and a nozzle piece for supporting the cavitation nozzle (9) is provided on the pump frame (2).

2. The non-contact cavitation cleaning pump for fragile optical crystals according to claim 1, characterized in that: A pump seat (12) is fixedly installed between the lower edges of the opposite surfaces of the two connecting frames (13), and the piston pump (1) is fixed to the upper end of the pump seat (12) by bolts. The opposite surfaces of the two connecting frames (13) are both extended with protruding edges (27) near the middle, and the ends of the protruding edges (27) are penetrated and embedded with push seats (31), and the connecting lock frame (30) is connected to the push seat (31).

3. The non-contact cavitation cleaning pump for fragile optical crystals according to claim 2, characterized in that: Both ends of the connecting lock frame (30) are rotatably mounted with shaft columns (33), one of which is embedded in the end of the shaft groove claw (29), and the other is embedded in the end of the push seat (31). The inlet end of the piston pump (1) is fixedly connected to the water inlet pipe (6) through a flange.

4. The non-contact cavitation cleaning pump for fragile optical crystals according to claim 1, characterized in that: The locking member includes a synchronous frame (20) embedded between the front ends of the two slide bars (4), a frame seat (16) extends from the middle of the upper end of the pump frame (2), a pin shaft (17) is rotatably installed inside the frame seat (16), a Z-shaped lock frame (3) is rotatably installed on the outer surface of the pin shaft (17), the lower end of the Z-shaped lock frame (3) is pressed against the front end of the synchronous frame (20), a top spring seat (19) extends from the middle of the rear end of the pump frame (2), a locking spring (18) is fixedly installed at the end of the top spring seat (19), and the end of the locking spring (18) is fixed to the rear end of the Z-shaped lock frame (3).

5. The non-contact cavitation cleaning pump for fragile optical crystals according to claim 4, characterized in that: The front lower edge of the Z-shaped lock frame (3) is inclined, and the upper rear edge of the synchronous frame (20) is provided with an inclined groove (14), and the inclined groove (14) is aligned with the Z-shaped lock frame (3). The front lower edge of the frame seat (16) is obliquely extended with a top frame claw (15), and the top frame claw (15) is pressed against the lower end of the Z-shaped lock frame (3).

6. The non-contact cavitation cleaning pump for fragile optical crystals according to claim 1, characterized in that: The nozzle support member comprises a nozzle support frame (8) fixedly mounted on the upper end of the pump frame (2) near the edge, a ball support seat (23) fixedly mounted on the end of the nozzle support frame (8), an adaptable ball (21) coaxially embedded on the outer surface of the cavitation nozzle (9), a ball pressing cover (22) provided on the upper end of the ball support seat (23), and the ball pressing cover (22) and the ball support seat (23) clamped to the outer surface of the adaptable ball (21).

7. The non-contact cavitation cleaning pump for fragile optical crystals according to claim 6, characterized in that: A door frame (24) extends from the upper end of the ball support seat (23), and the ball pressing cover (22) is slidably mounted inside the door frame (24).

8. The non-contact cavitation cleaning pump for fragile optical crystals according to claim 7, characterized in that: A threaded column (25) is screwed through the middle of the upper end of the door frame (24), the lower end of the threaded column (25) is rotatably connected to the middle of the upper end of the pressure ball cover (22), and a hand wheel (32) is coaxially fixedly mounted on the upper end of the threaded column (25).

Citation Information

Patent Citations

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