A laser cutting device for snow plough blade production

Abstract

The application discloses a kind of laser cutting equipment for snowplow blade production involving snowplow blade cutting technical field, including main body, ceramic ring in the bottom of main body, nozzle connected in the bottom of ceramic ring, connecting assembly is arranged between the nozzle and ceramic ring, the connecting assembly includes the sleeve ring of ceramic ring near bottom end and the sleeve ring and the several connecting slots of the outer circular surface on the top of nozzle are set up.This application, when working, heat insulation cylinder is covered in the outside of ceramic ring and nozzle, and will not be affected by high temperature outward radiation diffusion;The whole process of dismounting nozzle can be completed by pressing the outer wall of heat insulation cylinder, and the hand does not need to touch the ceramic ring and nozzle of high temperature, avoids the risk of high temperature scald, without the need for operating personnel to directly contact high temperature parts, without waiting for nozzle, ceramic ring natural cooling cooling can be disassembled and replaced immediately, avoid the production interruption caused by long time shutdown waiting, continuous completion snowplow blade laser cutting processing, improve batch production efficiency.

Description

Technical Field

[0001] This invention relates to the field of snowplow blade cutting technology, specifically to a laser cutting device for producing snowplow blades. Background Technology

[0002] Snowplow blades (also known as snowplow blades, snowplow blades, or snow shovel blades) are core rigid working components mounted on the front of snowplows and used to directly contact, cut, and push away snow and thin ice layers. Currently, the blank processing of snowplow blades generally adopts laser cutting technology. Due to the differences in product specifications, the thickness of the blade blanks suitable for different working conditions varies significantly, and the laser nozzle aperture specifications required for cutting processing also need to be matched accordingly.

[0003] Therefore, during mass production, it is necessary to frequently disassemble and replace nozzles with different orifice diameters according to the thickness of the shovel blank. At the same time, the nozzles are prone to wear and slag accumulation due to long-term high-temperature operation, and need to be disassembled and repaired regularly, making high-frequency disassembly and assembly of nozzles a routine operation in the production process.

[0004] The nozzle assembly structure of existing laser cutting heads mostly adopts the traditional threaded locking connection method. Some existing technologies also use a manual snap-on quick-release structure, such as the snap-on and disassembly structure disclosed in Chinese patents with application numbers 202021845117.7, 202322974548.3, and 202422963523.8, which simplifies the disassembly and assembly process to a certain extent.

[0005] However, under the high-frequency nozzle changing conditions of laser cutting of snowplow blades, the existing disassembly and assembly structure still has the problem of lack of protection during high-temperature disassembly and assembly; specifically, during the laser cutting operation, the nozzle and ceramic ring are continuously subjected to the high temperature of the laser operation, and after the equipment is stopped, a large amount of high-temperature heat will remain on the surface of the parts for a long time; the conventional method of wearing heat-resistant gloves has limited protection effect, is cumbersome to operate and has poor disassembly and assembly accuracy, and cannot be effectively adapted to high-frequency disassembly and assembly conditions.

[0006] Existing technologies rely solely on exposed nozzle assembly, requiring operators to directly handle high-temperature components during nozzle replacement, which can easily lead to burns and other safety accidents. To avoid the risk of burns, production often requires long shutdowns to allow the nozzles and ceramic rings to cool down naturally, significantly reducing production time, interrupting continuous processing, and severely reducing the production efficiency of batch cutting with shovels. This technology is unsuitable for the high-frequency nozzle replacement requirements.

[0007] Based on this, the present invention designs a laser cutting device for the production of snowplow blades to solve the above problems. Summary of the Invention

[0008] The purpose of this invention is to provide a laser cutting device for producing snowplow blades, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a laser cutting device for producing snowplow blades, comprising a main body, a ceramic ring at the bottom of the main body, and a nozzle connected to the bottom of the ceramic ring. A connecting assembly is provided between the nozzle and the ceramic ring. The connecting assembly includes a collar fitted onto the ceramic ring near the bottom end and several connecting grooves formed on the outer circumferential surface of the top of the nozzle. Several sliding grooves are formed on the collar. A retaining element is elastically slidably connected to the inner wall of the sliding groove. A retaining groove is formed on the inner side of the retaining element. An inclined surface is formed at the top of the retaining element. A heat insulation cylinder is provided above the collar. The heat insulation cylinder is elastically slidably connected to the ceramic ring near the top end. A groove is formed on the side wall of the heat insulation cylinder at a position corresponding to the retaining element.

[0010] As a further embodiment of the present invention, the bottom wall of the slot is provided with a top piece, the top piece being inverted U-shaped and extending upward at its end.

[0011] As a further embodiment of the present invention, the top plate is a high-temperature resistant elastic metal strip. The elastic metal strip elastically abuts against the lower end of the outer circle of the nozzle, and compensates for the thermal expansion and contraction deformation of the nozzle by its own elastic deformation and pushes the nozzle upward.

[0012] As a further embodiment of the present invention, a heat insulation pad is provided between the bottom of the top piece and the bottom wall of the card slot.

[0013] As a further embodiment of the present invention, a positioning element is fixedly provided at the bottom of the collar, and the positioning element is slidably connected to the connecting groove.

[0014] As a further embodiment of the present invention, the bottom wall of the heat insulation cylinder is elastically slidably connected with a pressure plate, the outer circular surface of the top of the nozzle is slightly larger than the collar, and the pressure plate is used to press down the nozzle.

[0015] As a further embodiment of the present invention, after the heat insulation cylinder descends to the bottom, its bottom end is lower than the bottom end of the card.

[0016] As a further embodiment of the present invention, a guide rod is slidably connected to the inner wall of the heat insulation cylinder, the guide rod is inserted into a collar, a fixing ring is bolted to the top of the guide rod, the fixing ring is fixed to the outside of the ceramic ring, and a spring is provided between the heat insulation cylinder and the fixing ring, and the heat insulation cylinder is elastically slidably connected to the ceramic ring through the spring.

[0017] Compared with the prior art, the beneficial effects of the present invention are: This invention features a heat insulation cylinder that covers the ceramic ring and nozzle during operation, preventing them from being affected by high-temperature radiation. The entire process of disassembling and assembling the nozzle only requires pressing the outer wall of the heat insulation cylinder to unlock it, eliminating the need for hands to touch the high-temperature ceramic ring and nozzle, thus avoiding the risk of burns. It also eliminates the need for operators to directly contact high-temperature components and allows for immediate nozzle replacement without waiting for the nozzle and ceramic ring to cool down naturally, avoiding production interruptions caused by prolonged downtime. This enables continuous laser cutting of snowplow blades, improving batch production efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the overall structure of the present invention; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a schematic diagram showing the movement of the locking element along the collar after the heat insulation cylinder of the present invention has descended to its limit. Figure 5 This is a schematic diagram showing the connection relationship between the collar, nozzle, and clamping element of the present invention; Figure 6 For this Figure 5 A magnified view of a section at point B in the middle; Figure 7 This is a schematic diagram showing the positional relationship between the bottom end of the heat insulation cylinder and the bottom of the clamp after the heat insulation cylinder has descended to its limit. Figure 8 This is a schematic diagram showing the card and connecting slot of the present invention. Figure 9 This is a schematic diagram showing the nozzle being pushed upwards when the top plate moves relative to the connecting groove according to the present invention; Figure 10 For the present invention Figure 9 Enlarged view of point C (i.e., schematic diagram of the movement trajectory of the top piece); Figure 11 This is a schematic diagram showing the connection relationship between the fixing ring, the guide rod, and the heat insulation cylinder of the present invention; Figure 12 for Figure 11 A magnified view of a section at point D; Figure 13 This is a schematic diagram of the initial contact between the tablet and the nozzle in this invention; Figure 14 This is a schematic diagram of the tablet pressing nozzle after the present invention is pressed down.

[0019] The attached diagram lists the components represented by each number as follows: 1. Main body; 2. Ceramic ring; 3. Nozzle; 4. Collar; 5. Connecting groove; 6. Slide groove; 7. Clamping piece; 701. Clamping groove; 702. Spring 2; 8. Inclined surface; 9. Heat insulation cylinder; 901. Groove; 10. Top plate; 11. Positioning piece; 12. Pressing plate; 13. Guide rod; 14. Fixing ring; 15. Spring 1; 16. Heat insulation pad; 17. Spring 3. Detailed Implementation

[0020] Please see Figures 1-14 This invention provides a technical solution: a laser cutting device for producing snowplow blades, comprising a main body 1, a ceramic ring 2 at the bottom of the main body 1, and a nozzle 3 connected to the bottom of the ceramic ring 2. A connecting assembly is provided between the nozzle 3 and the ceramic ring 2. The connecting assembly includes a collar 4 sleeved on the ceramic ring 2 near the bottom end and several connecting grooves 5 opened on the outer circular surface of the top of the nozzle 3. Several sliding grooves 6 are opened on the collar 4. A retaining member 7 is slidably connected to the inner wall of the sliding groove 6. A second spring 702 is fixed between the retaining member 7 and the inner wall of the sliding groove 6. A retaining groove 701 is opened on the inner side of the retaining member 7. An inclined surface 8 is provided at the top of the retaining member 7. A heat insulation cylinder 9 is provided above the collar 4. The heat insulation cylinder 9 and the ceramic ring 2 near the top end are elastically slidably connected by a first spring 15. A groove 901 is opened on the side wall of the heat insulation cylinder 9 at the corresponding position of the retaining member 7.

[0021] like Figures 1-7 As shown: When in the cutting state: Figure 1 and Figure 2 These are front and side views of the nozzle 3 in its working state, respectively. Under the elastic support of spring 15, the heat insulation cylinder 9 is maintained at its highest position. A gap is reserved at the bottom of the heat insulation cylinder 9 and the connection position of the nozzle 3 and ceramic ring 2. This gap can block the heat generated by the cutting operation from being conducted to the heat insulation cylinder 9.

[0022] In actual production, due to the variation in the thickness of the snowplow blank, the only difference in the inner diameter of the nozzle 3 used is that the overall shape and outer diameter of the nozzle 3 of each specification remain the same. When it is necessary to switch processing specifications or repair the nozzle 3, the nozzle 3 needs to be disassembled and reassembled.

[0023] The disassembly process is as follows: During disassembly, the operator holds the heat insulation cylinder 9 and applies downward pressure, causing it to move downwards along the ceramic ring 2. Once the heat insulation cylinder 9 has moved to the edge of the side wall groove 901 and contacts the inclined surface 8 at the top of the retaining piece 7, the inclined surface 8 forces the retaining piece 7 to move along the sliding groove 6 of the collar 4 from the direction away from the connecting groove 5 towards the connecting groove 5 (the direction of movement is...). Figure 4 (The direction of the dashed arrow in the middle), synchronous compression spring 2702.

[0024] Heat insulation cylinder 9 Figure 2 The high level shown has fallen to Figure 4 When the nozzle is in the low position, the slot 701 disengages from the top outer circle of the nozzle 3 and aligns with the connecting slot 5. The nozzle 3 loses its vertical constraint and automatically falls downwards by its own weight. At the same time, the positioning part 11, which is fixed to the collar 4, exits the non-aligned connecting slot 5, thus completing the disassembly of the nozzle 3.

[0025] During the drop phase of nozzle 3, the operator only needs to catch it from below. After disassembly, the heat insulation cylinder 9 can be loosened so that it can automatically return to its initial position at the top with the help of spring 15, or the heat insulation cylinder 9 can be kept pressed down.

[0026] like Figure 7 As shown, after the heat insulation cylinder 9 descends to its limit position, the horizontal height of its bottom end is marked by the dotted line P1. The bottom reference of the clamp 7 is P, and P1 is lower than P. The heat insulation cylinder 9, when pressed into place, completely covers the high-temperature connection area between the ceramic ring 2 and the nozzle 3, isolating the high-temperature heat source and preventing operators from being burned by touching it with their bare hands. In addition to the limit dimension of P1, the body of the heat insulation cylinder 9 can also be lengthened so that the bottom end of the pressure limit position corresponds to P2 or P3. Under the P2 condition, the bottom of the cylinder is close to the lower end of the nozzle 3, and under the P3 condition, the bottom of the cylinder is lower than the lower end of the nozzle 3. Both lengthening schemes can achieve full isolation of the high-temperature area, taking into account both heat insulation protection and the requirement for the nozzle 3 to fall off freely.

[0027] Since only the clip 7 is currently exposed, an outer cylinder can be fitted over the heat insulation cylinder 9 to ensure that the clip 7 can be completely isolated from the outside after the heat insulation cylinder 9 descends to its limit (the outer cylinder is not shown in the figure).

[0028] The installation process is as follows: Before installing the new nozzle 3, continuously press down the heat insulation cylinder 9 to keep it at its lowest position, so that the clip 7 and the slot 701 are kept in the unlocked position corresponding to the connecting slot 5; then insert the new nozzle 3 to be assembled from the lower opening of the heat insulation cylinder 9 upwards.

[0029] During the upward insertion of nozzle 3, the heat insulation cylinder 9, which is sleeved on the outside of ceramic ring 2, can achieve high-temperature isolation and protection during the installation process. The outer circle of the top of nozzle 3 first abuts against the bottom of clamp 7, and clamp 7 will form a barrier. The operator rotates slightly and pushes nozzle 3 upward until any two connecting grooves 5 on nozzle 3 are aligned with the position of clamp 7 and penetrate upward into the inside of clamp 7. The remaining connecting grooves 5 slide along the outer wall of positioning member 11, and positioning member 11 completes the radial limitation of nozzle 3 and coaxial guidance of ceramic ring 2.

[0030] After alignment, the heat insulation cylinder 9 is released, and the spring 15 rebounds and pulls the heat insulation cylinder 9 to return to its original position. The inner wall of the heat insulation cylinder 9 gradually separates from the top inclined surface 8 of the clamp 7. The spring 2 702 rebounds and drives the clamp 7 to slide outward along the slide groove 6. Due to the circumferential locking restriction of the positioning component 11, the assembled nozzle 3 cannot rotate circumferentially. The clamp 701 then moves to the lower outer circle of the nozzle 3 outside the connecting groove 5, limiting the nozzle 3 vertically to prevent it from falling off. Relying on the vertical limiting of the clamp 7 and the anti-rotation limiting of the positioning component 11, the nozzle 3 is locked and prevented from loosening. There is no need to touch the high-temperature components throughout the process, and there is no risk of burns.

[0031] In this invention, the heat insulation cylinder 9 covers the outer side of the ceramic ring 2 and the nozzle 3 during operation, preventing them from being affected by the outward radiation of high temperature. The entire process of disassembling and assembling the nozzle 3 only requires pressing the outer wall of the heat insulation cylinder 9 to unlock it. The hands do not need to touch the high temperature ceramic ring 2 and the nozzle 3, avoiding the risk of high temperature burns. The operator does not need to directly contact the high temperature components, and the nozzle 3 can be disassembled and assembled immediately without waiting for the nozzle 3 and the ceramic ring 2 to cool down naturally. This avoids production interruptions caused by long downtime and enables continuous completion of laser cutting processing of snowplow blades, improving the efficiency of mass production.

[0032] The bottom wall of the card slot 701 is provided with a top piece 10, which is inverted U-shaped and extends upward at the end.

[0033] The top plate 10 is a high-temperature resistant elastic metal strip. The elastic metal strip elastically abuts against the lower end of the outer circle of the nozzle 3, and compensates for the thermal expansion and contraction deformation of the nozzle 3 by its own elastic deformation and pushes the nozzle 3 upward.

[0034] A heat insulation pad 16 is provided between the bottom of the top plate 10 and the bottom wall of the card slot 701.

[0035] like Figure 6 , Figures 8-10 As shown: After nozzle 3 completes alignment and insertion, and heat insulation cylinder 9 returns to its upward position, clamp 7 disengages from connecting groove 5 and slides laterally to below the annular outer circle of nozzle 3 (from... Figure 8 Towards Figure 9 (As shown, it slides); during this process, the upward-sloping end of the top plate 10 gradually presses against the lower end face of the annular outer circle of the nozzle 3, using the inclined pushing action to continuously lift the nozzle 3 upward (the state before lifting is...). Figure 8 At this time, the distance between the collar 4 and the ceramic ring 2 is L, and the state when it is lifted is... Figure 9 At this point, the distance between the two is reduced to L1. Figure 10 This is a schematic diagram of the movement path before and after sliding (the direction of the dashed arrow is the displacement direction), so that the top end face of the nozzle 3 is tightly pressed against the bottom end face of the ceramic ring 2, eliminating the assembly gap, ensuring the sealing effect between the nozzle 3 and the ceramic ring 2, and avoiding problems such as air leakage and sealing failure.

[0036] The top plate 10 is preferably made of beryllium bronze, which has excellent high temperature resistance and constant elasticity, and can maintain stable elastic deformation capacity for a long time.

[0037] During operation, the copper nozzle 3 expands radially due to the high temperature of laser cutting. The expansion and extrusion pressure can directly act on the top plate 10, causing the top plate 10 to undergo a slight elastic yielding deformation, which can absorb the thermal expansion margin of the nozzle 3 and avoid the problem of high temperature jamming and seizing caused by rigid contact.

[0038] When the equipment stops and cools down, the radial dimension of nozzle 3 shrinks and the top plate 10 automatically rebounds and resets under its own elasticity, compensating for the small gap caused by the shrinkage of nozzle 3, and continuously pushes nozzle 3 upward to ensure that nozzle 3 and ceramic ring 2 are always in close contact to avoid defects such as high temperature jamming and low temperature air leakage, and adapt to the high frequency start-stop and cold and hot cycle working conditions of the equipment.

[0039] Meanwhile, the heat insulation pad 16 added to the bottom of the top plate 10 can be made of mica sheet, which can effectively block the high temperature heat of the nozzle 3 during operation from being conducted to the card 7 and the bottom of the top plate 10, greatly reducing the working temperature rise of the elastic metal top plate 10, avoiding elastic fatigue and performance degradation caused by high temperature heat accumulation, so that the top plate 10 can maintain a stable elastic compensation function for a long time, and improve the overall service life and working stability.

[0040] A pressure plate 12 is slidably connected to the bottom wall of the heat insulation cylinder 9. A spring 17 is fixed between the pressure plate 12 and the heat insulation cylinder 9. The outer surface of the top of the nozzle 3 is slightly larger than the collar 4. The pressure plate 12 is used to press down the nozzle 3.

[0041] like Figures 11-14 As shown: The vertical extension line of the outer circular surface of the nozzle 3 is Q1, and the vertical extension line of the outer circular surface of the collar 4 is Q; during the downward sliding and unlocking process of the heat insulation cylinder 9, when the heat insulation cylinder 9 is about to move to the extreme downward position, the bottom surface of the pressure plate 12 first contacts the outer circular surface of the nozzle 3; as the heat insulation cylinder 9 continues to move downward to the extreme position (such as... Figure 14 As shown in the figure), the pressure plate 12 continuously applies downward elastic pressure to the top of the nozzle 3, forcing the nozzle 3 to move slightly downward, so that the distance between the nozzle 3 and the collar 4 is stretched and increased from the initial L2 shown in the figure to L3.

[0042] At the same time, under the reverse pushing action of the nozzle 3, the pressure plate 12 slides towards the inner wall of the heat insulation cylinder 9 and compresses the spring 17, forming an elastic pre-compression effect.

[0043] The purpose is that after long-term high-temperature operation, the contact end face of the nozzle 3 and the ceramic ring 2 is prone to high-temperature oxidation and slight sintering and adhesion. The nozzle 3 cannot be easily removed by its own weight. Even if the clip 7 is aligned and the connecting groove 5 is unlocked, the nozzle 3 will still be stuck due to adhesion and will not be easy to remove.

[0044] During the synchronous stroke of the heat insulation cylinder 9 being pressed down to unlock, the elastic downward pressure applied by the pressure plate 12 can actively break the slight high-temperature adhesive bond between the nozzle 3 and the ceramic ring 2, forcibly separating the nozzle 3 from the ceramic ring 2, and ensuring that the nozzle 3 can be smoothly detached and disassembled.

[0045] Meanwhile, spring 317 has elastic buffering, which can prevent the nozzle 3 from being squeezed and deformed or the end face from being damaged by rigid pushing.

[0046] A guide rod 13 is slidably connected to the inner wall of the heat insulation cylinder 9. The guide rod 13 is inserted into the collar 4. A fixing ring 14 is bolted to the top of the guide rod 13. The fixing ring 14 is fixed to the outside of the ceramic ring 2.

[0047] like Figure 12 As shown: The bottom of the guide rod 13 is provided with a plug-in end, and the corresponding position of the collar 4 is provided with a matching slot. The guide rod 13 is plugged into the collar 4 through the bottom plug-in end, which is convenient for assembly and quick disassembly, and facilitates the later inspection and replacement of parts.

[0048] The fixing ring 14 is fixedly fitted onto the outside of the ceramic ring 2, and the top of the guide rod 13 is locked and fixed between the fixing ring 14 and the ceramic ring 2 by a bolt, so as to achieve the vertical fixed installation of the guide rod 13.

[0049] During operation, the guide rod 13 passes through the heat insulation cylinder 9 and slides with it, which can play a precise vertical guiding role in the up and down elastic sliding stroke of the heat insulation cylinder 9, restricting the heat insulation cylinder 9 from radial displacement, shaking and rotation, and ensuring that the heat insulation cylinder 9 always slides smoothly in the vertical direction.

[0050] At the same time, the guide rod 13 synchronously limits the relative position of the collar 4 and the heat insulation cylinder 9, so that the groove 901 on the side wall of the heat insulation cylinder 9 can always be precisely aligned with the locking piece 7 on the collar 4, ensuring the stability and accuracy of each pressing unlocking action, avoiding unlocking jamming and structural jamming due to offset and misalignment, and improving the smoothness of nozzle 3 disassembly and assembly and structural stability.

Claims

1. A laser cutting device for producing snowplow blades, comprising a main body (1), a ceramic ring (2) at the bottom of the main body (1), and a nozzle (3) connected to the bottom of the ceramic ring (2), characterized in that: A connecting assembly is provided between the nozzle (3) and the ceramic ring (2). The connecting assembly includes a collar (4) sleeved on the ceramic ring (2) near the bottom end and several connecting grooves (5) opened on the outer circular surface of the top of the nozzle (3). Several sliding grooves (6) are opened on the collar (4). A retainer (7) is elastically slidably connected to the inner wall of the sliding groove (6). A retainer groove (701) is opened on the inner side of the retainer (7). An inclined surface (8) is provided at the top of the retainer (7). A heat insulation cylinder (9) is provided above the collar (4). The heat insulation cylinder (9) is elastically slidably connected to the ceramic ring (2) near the top end. A groove (901) is opened on the side wall of the heat insulation cylinder (9) at the corresponding position of the retainer (7).

2. The laser cutting equipment for producing snowplow blades according to claim 1, characterized in that: The bottom wall of the slot (701) is provided with a top piece (10), which is inverted U-shaped and extends upward at the end.

3. The laser cutting equipment for producing snowplow blades according to claim 2, characterized in that: The top plate (10) is a high-temperature resistant elastic metal strip. The elastic metal strip elastically abuts against the lower end of the outer circle of the nozzle (3), and compensates for the thermal expansion and contraction deformation of the nozzle (3) by its own elastic deformation and pushes the nozzle (3) upward.

4. The laser cutting equipment for producing snowplow blades according to claim 3, characterized in that: A heat insulation pad (16) is provided between the bottom of the top plate (10) and the bottom wall of the slot (701).

5. The laser cutting equipment for producing snowplow blades according to claim 4, characterized in that: The bottom of the collar (4) is fixed with a positioning element (11), and the positioning element (11) is slidably connected to the connecting groove (5).

6. The laser cutting equipment for producing snowplow blades according to claim 1, characterized in that: The bottom wall of the heat insulation cylinder (9) is elastically slidably connected with a pressure plate (12), the top outer circle of the nozzle (3) is slightly larger than the collar (4), and the pressure plate (12) is used to press down the nozzle (3).

7. The laser cutting equipment for producing snowplow blades according to claim 1, characterized in that: After the heat insulation cylinder (9) descends to the bottom, its bottom end is lower than the bottom end of the clip (7).

8. The laser cutting equipment for producing snowplow blades according to claim 7, characterized in that: The inner wall of the heat insulation cylinder (9) is slidably connected to a guide rod (13), the guide rod (13) is inserted into a collar (4), and a fixing ring (14) is bolted to the top of the guide rod (13). The fixing ring (14) is fixed to the outside of the ceramic ring (2). A spring (15) is provided between the heat insulation cylinder (9) and the fixing ring (14). The heat insulation cylinder (9) is elastically slidably connected to the ceramic ring (2) through the spring (15).

Images