Raw material core column preparation device for synthesizing diamonds

Abstract

The invention relates to the field of synthetic diamond raw material preparation, in particular to a raw material core column preparation device for synthetic diamonds, which comprises a motor I. The output end of the motor I is fixedly connected with an abduction support ring, and the inner wall surfaces of the upper and lower sides of the abduction support ring are fixedly provided with motors II; the output end of the second motor is fixedly connected with an inner container circular ring, third motors are fixedly installed on the inner wall faces of the two sides of the inner container circular ring, a mixing and stirring tank is arranged at the output ends of the third motors, and a second sealing cover is arranged on the surface of the top of the mixing and stirring tank. High-purity graphite powder and metal alloy powder such as iron, cobalt, nickel and manganese are poured into the mixing and stirring tank, and at the moment, a first motor, a second motor and a third motor are matched to rotate an outward supporting circular ring, an inner container circular ring and the mixing and stirring tank at multiple angles and multiple ranges; further, the raw materials are continuously overturned and mixed in the mixing and stirring tank.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of synthetic diamond raw material preparation, in particular to a raw material core column preparation device for synthesizing diamond. BACKGROUND

[0002] Diamond is a single-element crystal composed of carbon elements formed under high pressure and high temperature conditions in the deep part of the earth. Diamond is beautiful and rare, symbolizing love and loyalty, representing eternal love; most natural diamonds are colorless, the deeper the color tone, the worse the quality; a small amount of natural diamonds have colors such as yellow, green, blue, brown, pink, orange, red, black, and purple, which are rare treasures among diamonds and are expensive; with the development of science and technology, artificial synthetic diamond technology has developed, and international diamond companies such as De Beers Group and Swarovski have successively launched artificial diamond brands; artificial synthetic diamonds are completely the same as natural diamonds, and also have the advantages of lower cost, shorter cycle, and no damage to the ecological environment.

[0003] A patent with publication number CN107324329A discloses a preparation method of a raw material core column for synthesizing colorless diamond, which includes the following steps: 1) preparing alloy powder I and alloy powder II by water atomization method; 2) mixing diamond seed particles and zirconia particles to obtain non-metallic powder III; 3) mixing alloy powder I and non-metallic powder III and granulating to obtain alloy powder IV; 4) mixing alloy powder II and graphite powder and granulating to obtain alloy powder V; 5) mixing alloy powder IV and alloy powder V and pressing to form a raw material core column; 6) purifying the raw material core column to obtain a raw material core column for synthesizing colorless diamond. This method adds or does not add diamond seeds, uses strong bonding elements with nitrogen and other color-producing elements to absorb color-producing elements, and creates process conditions to eliminate color-producing elements in diamond products, which is an efficient process method for artificially synthesizing colorless diamonds.

[0004] In the prior art, before high temperature and high pressure processing of the existing synthetic diamond, the synthetic raw material of the diamond needs to be mixed and treated. Since the synthetic material is high-purity graphite powder and metal alloy powder of iron, cobalt, nickel, manganese, etc., due to the difference in material quality between the materials, the weight of the materials will also be different under the premise of the same volume. After mixing and stirring by the traditional stirring method, the internal materials will also be layered and separated due to the difference in weight when pouring out. Moreover, the material ratio of the synthetic diamond is an important factor of the synthetic diamond, and the stirring device will cause the high-purity graphite powder to adhere to the surface of the stirring tank and the stirring blade, thereby causing a certain amount of high-purity graphite powder to remain on the surface of the stirring tank and the stirring blade, resulting in deviation of the material ratio.

[0005] Therefore, the present application provides a raw material core column preparation device for synthesizing diamond. SUMMARY

[0006] To make up for the deficiencies of the prior art, at least one technical problem raised in the background art is solved.

[0007] The technical scheme adopted by the present application to solve its technical problems is: a raw material core column preparation device for synthetic diamond, comprising a motor one, an outer support ring is fixedly connected to the output end of the motor one, a motor two is fixedly installed on the inner wall surface of the upper and lower sides of the outer support ring, an inner container ring is fixedly connected to the output end of the motor two, a separate battery pack is fixedly installed on the outer side surface of the inner container ring, a motor three is fixedly installed on the inner wall surface of the two sides of the inner container ring, a mixing and stirring tank is arranged on the output end of the motor three, a closed cover two is arranged on the top surface of the mixing and stirring tank, two groups of dust filters are fixedly installed on the top surface of the mixing and stirring tank and located at the two side edge positions, the output end of the closed cover two extends to the inner side wall surface of the closed cover two, a hydraulic rod is fixedly installed on the bottom surface of the mixing and stirring tank, the output end of the hydraulic rod extends to the inner side wall surface of the mixing and stirring tank, a matching extrusion plate movably sleeved on the inner side wall surface of the mixing and stirring tank is fixedly connected to the output end of the hydraulic rod, and a ventilation hole is formed in the bottom surface of the mixing and stirring tank.

[0008] Preferably, a protective cover is arranged on the outer side surface of the motor one, and a support leg is fixedly installed on the outer side surface of the protective cover and located at the bottom edge position.

[0009] Preferably, a transmission rod is movably adjusted on the two side surfaces of the protective cover and located at the upper and lower two side edge positions, and a pushing gear is fixedly installed on the two side surfaces of the protective cover and located at the two ends of the bottom transmission rod.

[0010] Preferably, an auxiliary rod is movably sleeved on the two side surfaces of the protective cover and located at the bottom edge position, and a transmission gear is fixedly connected to the outer side surface of the auxiliary rod.

[0011] Preferably, the outer side surface of the transmission gear is movably lapped on the outer side surface of the pushing gear, and a transmission track is movably sleeved on the outer side surfaces of the transmission rod and the auxiliary rod.

[0012] Preferably, a closed cover one is fixedly connected to the outer side surface of the transmission rod, and two groups of hydraulic pushers are symmetrically fixedly installed on the two inner wall surfaces of the protective cover.

[0013] Preferably, an arc-shaped matching plate is fixedly connected to the output end of the hydraulic pusher, and a silica gel soft block is fixedly connected to the outer side surface of the arc-shaped matching plate.

[0014] Preferably, the outer surface of the silica gel soft block is fixedly provided with an arc-shaped matching anti-skid sheet, and the outer surface of the arc-shaped matching anti-skid sheet is movably connected to the outer surface of the outer supporting ring.

[0015] Preferably, the front surface of the transmission rod is provided with a butt joint groove at the upper and lower side edges, and the position of the first sealing cover is movably connected to the inner wall surface of the butt joint groove.

[0016] Preferably, the outer surface of the first sealing cover is provided with a semicircular groove, a rotating closing plate is movably connected to the outer surface of the first sealing cover, and the other end of the rotating closing plate is movably connected to the inner wall surface of the semicircular groove.

[0017] The beneficial effects of the present application are as follows: 1. The raw material core column preparation device for synthetic diamond, high-purity graphite powder and metal alloy powder of iron, cobalt, nickel and manganese are poured into the inside of the mixing and stirring tank, at this time, the outer supporting ring, the inner container ring and the mixing and stirring tank are rotated at multiple angles and ranges by cooperating with the motor one, the motor two and the motor three, so that the raw materials are continuously turned and mixed in the inside of the mixing and stirring tank, and the metal powder which is relatively heavy and has settled to the bottom layer of the material is re-flowed to the top surface in the turning process, and the heavy metal powder is mixed into the high-purity graphite powder in the subsequent turning, so that the different metal raw materials are fully mixed together by utilizing the continuous turning and stirring of the mixing and stirring tank at different stirring blades; 2. The raw material core column preparation device for synthetic diamond, after the metal powder in the inside of the mixing and stirring tank is mixed, the second sealing cover is not opened, so that the inside of the mixing and stirring tank remains in a sealed state, the material leakage from the inside of the mixing and stirring tank is reduced, the matching extrusion plate is slowly pushed up by cooperating with the hydraulic rod, the matching extrusion plate which is slowly lifted can effectively reduce the vibration of the matching extrusion plate, so that the raw materials on the top surface of the matching extrusion plate can remain in a stacked state, and the metal powder adhered to the inner wall surface of the mixing and stirring tank is scraped off and recycled when the matching extrusion plate is lifted, so that the residual powder adhered to the inner wall surface of the tank can be scraped off after the raw materials are mixed, and the matching extrusion plate which is slowly lifted and extruded can effectively reduce the vibration of the metal powder, so that the mixed metal powder remains in the original state; 3. The core column preparation device for the raw material of synthetic diamond, when the extrusion plate is lifted and pushed by the hydraulic rod, the metal powder is lifted and treated, as the space on the top of the extrusion plate is continuously compressed, the air in the mixing tank is absorbed and filtered by the dust filter, the gas in the mixing tank is discharged, and the powder in the air is left in the mixing tank under the filtration of the dust filter, as the metal powder on the surface of the top of the extrusion plate is continuously compressed, the gas in the metal powder is extruded and discharged, and the compressed metal powder is gradually compressed and formed, and the metal powder forms a powder blank, the material is taken out in the form of a whole core column blank after the closed cover two is opened, the material in the mixing tank is compressed, the soft raw material is rolled and formed, a simple core column blank is formed, and the effect that the metal powder is not easy to be left on the inner wall of the tank is effectively reduced; 4. The core column preparation device for the raw material of synthetic diamond, when the metal powder in the mixing tank is mixed, the transmission rod is rotated by the staff, the transmission track and the transmission gear are driven to rotate, the transmission gear is driven to drive the push gear, the closed cover one on the outer surface of the transmission rod and the push gear is extended, the inside of the protective cover changes from a sealed state to a flowing state, the motor one and the motor two stop rotating the mixing tank, the hydraulic pusher pushes the arc-shaped fitting plate, the arc-shaped fitting anti-skid piece on the outer surface of the arc-shaped fitting plate is fitted on the outer surface of the outer expansion support ring, and the outer expansion support ring is clamped and fixed, the position of the outer expansion support ring is limited when the mixing tank stops rotating, and the metal blank in the mixing tank is effectively replaced and taken. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application will be further described below with reference to the drawings.

[0019] Figure 1 is a perspective view of the application; Figure 2 is a perspective view of the protective cover in the application; Figure 3 is an expanded perspective view of the protective cover in the application; Figure 4 is a side expanded perspective view of the protective cover in the application; Figure 5 is a perspective view of the motor one in the application; Figure 6 is a cross-sectional perspective view of the mixing tank in the application; Figure 7 is a perspective view of the arc-shaped fitting plate in the application; Figure 8 is a perspective view of the closing cover one in the application.

[0020] In the figure: 11, protective cover; 111, transmission rod; 112, auxiliary rod; 113, transmission gear; 114, transmission track; 115, pushing gear; 116, hydraulic pusher; 117, arc-shaped fitting plate; 118, silica gel soft block; 119, arc-shaped fitting anti-skid sheet; 12, supporting leg; 13, closing cover one; 131, semicircular groove; 132, rotating closing plate; 14, motor one; 141, outward expansion supporting ring; 142, motor two; 143, inner container ring; 144, motor three; 145, dust filter; 146, closing cover two; 147, mixing and stirring tank; 148, air hole; 149, hydraulic rod; 1410, fitting extrusion plate. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, purposes and effects of the application easy to understand, the application is further described below in combination with specific embodiments.

[0022] As Figures 1 to 3 and Figure 5 - Figure 6 The application embodiment for the raw material core column preparation device of synthetic diamond includes motor one 14, the output end of motor one 14 is fixedly connected with outward expansion supporting ring 141, the inner wall surface of the upper and lower sides of outward expansion supporting ring 141 is fixedly installed with motor two 142, the output end of motor two 142 is fixedly connected with inner container ring 143, the inner wall surface of both sides of inner container ring 143 is fixedly installed with motor three 144, the output end of motor three 144 is provided with mixing and stirring tank 147, the top surface of mixing and stirring tank 147 is provided with closing cover two 146, two groups of dust filters 145 are fixedly installed on the top surface of mixing and stirring tank 147 and located at both side edge positions, the output end of closing cover two 146 extends to the inner side wall surface of closing cover two 146, hydraulic rod 149 is fixedly installed on the bottom surface of mixing and stirring tank 147, at the same time, independent battery group on the outer side wall surface of inner container ring provides energy for motor three, and makes inner container ring can be independently powered and independently operated, at the same time, cooperates with the gap between inner container ring and outward expansion supporting ring, so that outward expansion supporting ring and inner container ring staggered rotation will not damage independent battery group, and when the equipment does not work, independent battery group can be charged.

[0023] The high-purity graphite powder and metal alloy powder of iron, cobalt, nickel, manganese and the like are poured into the inside of the mixing stirring tank 147, at this time the motor one 14, the motor two 142 and the motor three 144 are used to rotate the outer support ring 141, the inner ring 143 and the mixing stirring tank 147 in multiple angles and multiple ranges, so that the raw materials are continuously turned and mixed in the inside of the mixing stirring tank 147, and the multiple angle turning can make some heavy metal powder that has settled to the bottom of the material flow to the top surface again in the turning process, and the heavy metal powder is mixed into the high-purity graphite powder under the subsequent turning, so that the different metal raw materials are fully mixed together under the continuous turning and stirring of the mixing stirring tank 147; After the metal powder in the mixing stirring tank 147 is mixed, the closed cover two 146 is not opened, so that the inside of the mixing stirring tank 147 still maintains a sealed state, reducing the leakage of the materials in the mixing stirring tank 147, at this time the hydraulic rod 149 is used to slowly lift and push the fitted extrusion plate 1410, the slowly lifted fitted extrusion plate 1410 can effectively reduce the vibration of the fitted extrusion plate 1410, so that the raw materials on the top surface of the fitted extrusion plate 1410 can always maintain a stacked state, and the fitted extrusion plate 1410 can scrape off the metal powder adhered to the inner wall of the mixing stirring tank 147 when it is lifted, so that the residual powder adhered to the inner wall of the tank can be scraped off after the raw materials are mixed, and the slowly lifted fitted extrusion plate 1410 can effectively reduce the vibration of the metal powder, so that the mixed metal powder always maintains the original state.

[0024] As shown in Figures 5 to 6 the output end of the hydraulic rod 149 extends to the inner wall of the mixing stirring tank 147, the output end of the hydraulic rod 149 is fixedly connected with the fitted extrusion plate 1410 which is movably sleeved on the inner wall of the mixing stirring tank 147, and the bottom surface of the mixing stirring tank 147 is provided with the air hole 148.

[0025] When the fitting extrusion plate 1410 is lifted by the lifting push of the hydraulic rod 149, the metal powder is lifted and treated. As the space at the top of the fitting extrusion plate 1410 is continuously compressed, the air inside the mixing and stirring tank 147 is absorbed and filtered by the dust filter 145, and the gas inside the mixing and stirring tank 147 is discharged. The powder in the air is left inside the mixing and stirring tank 147 after being filtered by the dust filter 145. As the metal powder on the top surface of the fitting extrusion plate 1410 is continuously compressed, the gas inside the metal powder is squeezed out, and the compressed metal powder is gradually compressed and formed into a powder blank. The material is taken out in the form of a whole core column blank after the closed cover 146 is opened, achieving the compression of the material inside the mixing and stirring tank 147 and the rolling and forming of the soft raw material into a simple core column blank. The effect of effectively reducing the metal powder left on the inner wall of the tank is achieved, avoiding the separation of the material inside due to the difference in weight after the metal powder is mixed and poured out, so that the different metal powder materials cannot be uniformly mixed, and metal separation occurs.

[0026] As Figures 1 to 4 and Figure 7 - Figure 8As shown, a protective cover 11 is provided on the outer surface of motor 14. A support leg 12 is fixedly installed on the outer surface of the protective cover 11 at its bottom edge. A transmission rod 111 is movably adjusted on both sides of the protective cover 11 at its upper and lower edges. Push gears 115 are fixedly installed on both sides of the protective cover 11 at its bottom edges. An auxiliary rod 112 is movably sleeved on both sides of the protective cover 11 at its bottom edge. A transmission gear 113 is fixedly connected to the outer surface of the auxiliary rod 112. The outer surface of the transmission gear 113 movably overlaps the outer surface of the push gear 115. A transmission track 114 is movably sleeved on the outer surfaces of the transmission rod 111 and the auxiliary rod 112. A sealing cover 13 is fixedly connected to the outer surface of the transmission rod 111. The two sides of the protective cover 11... Two sets of hydraulic actuators 116 are symmetrically fixedly installed on the inner side wall. An arc-shaped bonding plate 117 is fixedly connected to the output end of the hydraulic actuator 116. A silicone soft block 118 is fixedly connected to the outer surface of the arc-shaped bonding plate 117. An arc-shaped bonding anti-slip sheet 119 is fixedly installed on the outer surface of the silicone soft block 118. The outer surface of the arc-shaped bonding anti-slip sheet 119 is movably overlapped on the outer surface of the outward support ring 141. A docking groove is opened on the front of the transmission rod 111 and at the upper and lower edges. The position of the sealing cover 13 is movably sleeved on the inner wall of the docking groove. A semi-circular groove 131 is opened on the outer surface of the sealing cover 13. A rotating closing plate 132 is movably sleeved on the outer surface of the sealing cover 13. The other end of the rotating closing plate 132 is movably sleeved on the inner wall of the semi-circular groove 131.

[0027] After the metal powder inside the mixing tank 147 is mixed, the operator rotates the transmission rod 111, which drives the transmission belt 114 and transmission gear 113 to rotate. Driven by the transmission gear 113, the drive gear 115 is driven, causing the sealing cover 13 on the outer surface of the transmission rod 111 and drive gear 115 to extend, changing the interior of the protective cover 11 from a sealed state to a flowing state. Simultaneously, the motors 14 and 142 stop rotating the mixing tank 147. At this time, the hydraulic actuator 116 pushes the arc-shaped bonding plate 117, causing the arc-shaped bonding plate 117 to... The arc-shaped anti-slip sheet 119 on the outer surface of the 17 is attached to the outer surface of the outward support ring 141 and clamps and fixes the outward support ring 141, thereby limiting the position of the outward support ring 141 when it stops rotating, and thus effectively replacing and removing the metal blank inside the mixing tank 147; when the metal powder is put into the mixing tank 147, it rotates on the surface of the sealing cover 13 with the rotating closing plate 132, and the other end of the rotating closing plate 132 moves along the semi-circular groove 131, and the positions of the two sets of sealing covers 13 are locked and limited.

[0028] Working principle: High-purity graphite powder and metal alloy powders such as iron, cobalt, nickel, and manganese are poured into the mixing tank 147. At this time, motors 141, 142, and 144 rotate the outward support ring 141, the inner ring ring 143, and the mixing tank 147 at multiple angles and in multiple ranges. This causes the raw materials to be continuously turned over and mixed inside the mixing tank 147. This multi-angle turning allows some heavier metal powders that have settled to the bottom of the material to be guided back to the top surface during the turning process. With subsequent turning, the heavier metal powders are mixed into the interior of the high-purity graphite powder. This achieves the effect of fully mixing different metal raw materials together by using the mixing tank 147 to continuously turn and stir, while different stirring blades are used. After the metal powder inside the mixing tank 147 is mixed, there is no need to open the sealing cover 146, so that the inside of the mixing tank 147 remains sealed, reducing the leakage of materials inside the mixing tank 147. At this time, the hydraulic rod 149 is used to lift and slowly push the bonding extrusion plate 1410. The slowly lifted bonding extrusion plate 1410 can effectively reduce the vibration of the bonding extrusion plate 1410, so that the raw materials on the top surface of the bonding extrusion plate 1410 can remain in a state of accumulation. Moreover, when the bonding extrusion plate 1410 is lifted, it will scrape off the metal powder adhering to the inner wall of the mixing tank 147 for recycling. This achieves the effect of scraping off some residual powder adhering to the inner wall of the tank after the raw materials are mixed. At the same time, the slowly lifted and extruded bonding extrusion plate 1410 can effectively reduce the vibration of the metal powder, so that the mixed metal powder remains in its original state. When the bonding extrusion plate 1410 is lifted and pushed by the hydraulic rod 149, it lifts the metal powder. As the space at the top of the bonding extrusion plate 1410 is continuously compressed, the dust filter 145 absorbs and filters the air inside the mixing tank 147, releasing the gas inside the mixing tank 147. The powder in the air will remain inside the mixing tank 147 after being filtered by the dust filter 145. As the metal powder on the top surface of the bonding extrusion plate 1410 is continuously compressed, the gas inside the metal powder is squeezed out and the compressed metal powder is gradually compressed and shaped into a powder blank. Later, the sealing cover 146 is opened to take out the material in the form of a core column blank. This achieves the effect of compressing the material inside the mixing tank 147 and crushing the soft raw materials to form a simple core column blank that is not easy to break, effectively reducing the metal powder left on the inner wall of the tank.

[0029] The foregoing has shown and described 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 embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for preparing a core for synthetic diamond, comprising a motor (14), characterized in that: An outward support ring (141) is fixedly connected to the output end of motor one (14). Motor two (142) is fixedly installed on the inner walls of the upper and lower sides of the outward support ring (141). An inner liner ring (143) is fixedly connected to the output end of motor two (142). Motor three (144) is fixedly installed on the inner walls of the inner liner ring (143) on both sides. A mixing tank (147) is provided on the output end of motor three (144). A sealing cover two (146) is provided on the top surface of the mixing tank (147). The top surface of the mixing tank (147) and Two dust filters (145) are fixedly installed on both sides of the edge. The output end of the second closed cover (146) extends to the inner wall of the second closed cover (146). A hydraulic rod (149) is fixedly installed on the bottom surface of the mixing tank (147). The output end of the hydraulic rod (149) extends to the inner wall of the mixing tank (147). A fitting extrusion plate (1410) is fixedly connected to the output end of the hydraulic rod (149) and is movably sleeved on the inner wall of the mixing tank (147). A vent hole (148) is opened on the bottom surface of the mixing tank (147).

2. The apparatus for preparing a raw material core for synthetic diamond according to claim 1, characterized in that: A protective cover (11) is provided on the outer surface of the motor (14), and a support leg (12) is fixedly installed on the outer surface of the protective cover (11) at the bottom edge.

3. The apparatus for preparing a raw material core for synthetic diamond according to claim 2, characterized in that: The protective cover (11) has a transmission rod (111) movable on both sides of the protective cover (11) and at the upper and lower edges. Push gears (115) are fixedly installed on both sides of the protective cover (11) and at both ends of the bottom transmission rod (111).

4. The apparatus for preparing a raw material core for synthetic diamond according to claim 3, characterized in that: An auxiliary rod (112) is movably sleeved on both sides of the protective cover (11) and at the bottom edge. A transmission gear (113) is fixedly connected to the outer surface of the auxiliary rod (112).

5. The apparatus for preparing a raw material core for synthetic diamond according to claim 4, characterized in that: The outer surface of the transmission gear (113) is movably connected to the outer surface of the push gear (115), and the transmission track (114) is movably sleeved on the outer surfaces of the transmission rod (111) and the auxiliary rod (112).

6. The apparatus for preparing a raw material core for synthetic diamond according to claim 5, characterized in that: A closed cover (13) is fixedly connected to the outer surface of the transmission rod (111), and two sets of hydraulic actuators (116) are symmetrically fixedly installed on the inner walls of both sides of the protective cover (11).

7. The apparatus for preparing a raw material core for synthetic diamond according to claim 6, characterized in that: An arc-shaped bonding plate (117) is fixedly connected to the output end of the hydraulic actuator (116), and a silicone soft block (118) is fixedly connected to the outer surface of the arc-shaped bonding plate (117).

8. The apparatus for preparing a raw material core for synthetic diamond according to claim 7, characterized in that: An arc-shaped anti-slip sheet (119) is fixedly installed on the outer surface of the silicone block (118), and the outer surface of the arc-shaped anti-slip sheet (119) is movably overlapped on the outer surface of the outward support ring (141).

9. The apparatus for preparing a raw material core for synthetic diamond according to claim 8, characterized in that: The transmission rod (111) has a docking slot on its front side and at the upper and lower edges, and the closing cover (13) is movably fitted onto the inner wall of the docking slot.

10. The apparatus for preparing a raw material core for synthetic diamond according to claim 9, characterized in that: A semi-circular groove (131) is provided on the outer surface of the first closed cover (13), and a rotating closing plate (132) is movably sleeved on the outer surface of the first closed cover (13), and the other end of the rotating closing plate (132) is movably sleeved on the inner wall of the semi-circular groove (131).

Images