Hot joint vulcanization mold for rubber sealing element

Abstract

The invention discloses a rubber sealing element hot joining vulcanization mold, and belongs to the field of hot joining vulcanization molds, the rubber sealing element hot joining vulcanization mold comprises a base, a lower mold is fixedly mounted on the base, a material conveying assembly is arranged on the lower mold, an exhaust assembly is arranged on the base, a cleaning assembly is arranged on the lower mold, and a lifting assembly is arranged on the base. A fixing disc is installed on the base through the lifting assembly, an upper mold is fixedly installed at the lower end of the fixing disc, the exhaust assembly comprises a collecting box fixedly installed on the lower mold, and supports which are annularly and evenly distributed are fixedly installed on the base. According to the device, the exhaust holes can be cleaned in the processes of heating the sizing material and applying pressure to the sizing material, so that the smoothness of gas exhaust of the exhaust holes can be effectively ensured, meanwhile, through cooperation of the knocking mechanism and the exhaust component, exhaust of bubbles and gas in the sizing material can be accelerated, and the service life of the sizing material is prolonged. And the overall strength and quality of the rubber sealing element which is finally vulcanized can be improved.

Description

Technical Field

[0001] The invention relates to the field of heat-welding vulcanization molds, and more specifically to a heat-welding vulcanization mold for a rubber sealing component. Background Art

[0002] With the increasing requirements of industrial production for rubber manufacturing, hot-welding vulcanization molds specially used for making rubber seals have come into being. The mold vulcanizes the rubber material under high temperature and high pressure conditions to achieve a tighter molecular structure of the rubber seal, thereby effectively improving the performance of the product and reducing the production cost to a certain extent. Therefore, it is widely used in the production process of rubber seals.

[0003] In the process of vulcanizing the rubber material in the hot-welding vulcanization mold, whether the bubbles and gases generated can be discharged effectively and smoothly has an important influence on the strength and overall quality of the rubber seal finally made. Although the existing mold is provided with a vent hole for venting, in order to ensure the smoothness of the gas discharged from the vent hole, the vent hole needs to be cleaned manually regularly, which is inconvenient to operate. Moreover, when the mold applies pressure to the rubber material, the overflowing rubber material blocks the vent hole, if the vent hole is not cleaned in time, it is easy to increase the concentration of internal stress of the rubber seal and reduce the strength of the rubber seal finally made by vulcanization. Therefore, it is urgent to design a hot-welding vulcanization mold for rubber seals to solve the above problems. Summary of the invention

[0004] In view of the problems existing in the prior art, the object of the present invention is to provide a rubber sealing component heat-welding vulcanization mold.

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A rubber seal heat-welding vulcanization mold, comprising a base, a lower mold is fixedly mounted on the base, a material feeding component is arranged on the lower mold, an exhaust component is arranged on the base, and a cleaning component is arranged on the lower mold;

[0007] The base is provided with a lifting assembly, and a fixed plate is installed through the lifting assembly, and an upper mold is fixedly installed at the lower end of the fixed plate;

[0008] The exhaust assembly comprises a collecting box fixedly mounted on the lower mold, a ring-shaped evenly distributed bracket is fixedly mounted on the base, a disc is fixedly mounted between the brackets, a knocking mechanism is installed between the disc and the lower mold, an exhaust component is installed on the disc, and an exhaust pipe is fixedly connected to the disc;

[0009] The lower mold is provided with exhaust holes evenly distributed in a ring shape, the cleaning component includes movable grooves evenly opened in a ring shape on the lower mold, and the movable grooves are connected with the corresponding exhaust holes, support frames are slidably installed on the movable grooves, and one end of the support frames is sealed and penetrated and slidably installed on the collection box, cleaning components are commonly installed between the support frames, a support plate is slidably installed on the exhaust pipe, a connecting piece is rotatably installed between the support frame and the support plate, and a pressing component is installed at the lower end of the fixed plate.

[0010] Furthermore, the lifting assembly includes a limit cylinder fixedly mounted on the base, a servo motor fixedly mounted on the base, a reciprocating screw fixedly mounted on the driving end of the servo motor, a slider mounted on the reciprocating screw via a ball nut, a support rod fixedly mounted on the slider, and a fixed plate fixedly mounted on the lower end of the support rod.

[0011] Further, the knocking mechanism includes a placement groove opened on the base, a driving component is installed on the placement groove, round rods evenly distributed in an annular shape are fixedly installed on the lower mold, plates are fixedly installed on the round rods, cavities evenly distributed in an annular shape are opened on the disc, slide grooves evenly distributed in an annular shape are opened on the disc, and the cavities are connected with corresponding slide grooves, pistons are sealed and slidably installed on the cavities, push plates are fixedly installed on the pistons, and knocking plates are fixedly installed on the push plates;

[0012] A push rod is fixedly installed at the lower end of the push plate, a wind shield plate is passed through and fixedly installed on the push rod, and the wind shield plate is sealed and slidably installed on the corresponding slide groove.

[0013] Furthermore, the driving component includes a motor fixedly mounted on the placement slot, a rotating disk is fixedly mounted on the driving end of the motor, the rotating disk is provided with guide grooves evenly distributed in an annular shape, and the lower ends of the push rods are slidably mounted on the corresponding guide grooves.

[0014] Furthermore, the exhaust component includes grooves that are evenly arranged in an annular shape on the disc, and the grooves are connected to corresponding cavities, one-way air supply pipes are fixedly installed on the grooves, a filter is fixedly installed in the exhaust pipe, and one-way air suction pipes that are evenly distributed in an annular shape are fixedly connected to the disc, and one end of the one-way air suction pipes extends into the corresponding cavity, and the other end of the one-way air suction pipes is fixedly connected to a collection box, and a sealing cover is sealingly installed on the collection box.

[0015] Furthermore, the cleaning components include loose-leaf plates 1 rotatably mounted on support frames, on which circular shaft 1 is fixedly mounted, loose-leaf plates 2 rotatably mounted on support frames, on which circular shaft 2 is fixedly mounted, and a plurality of arc grooves are provided on the lower mold, and the arc grooves are all connected to the corresponding movable grooves.

[0016] Furthermore, the pressing component includes a supporting roller fixedly installed at the lower end of the fixed plate, two supporting rollers are provided, and a fixing plate is fixedly installed on each of the supporting rollers, and two fixing plates are provided, a rotating shaft is rotatably installed on each of the fixing plates, a torsion spring is fixedly installed between the rotating shaft and the corresponding fixed plate, a rod body is fixedly installed on each of the fixing plates, a friction plate matching the corresponding rotating shaft is fixedly installed on the rod body, and a pressing plate is fixedly installed on the rotating shaft.

[0017] Furthermore, a positioning plate is fixedly mounted on the exhaust duct, and return springs evenly distributed in a ring shape are fixedly mounted on the positioning plate, and the return springs are fixedly connected to the support plate, and a limited displacement plate is fixedly mounted on the exhaust duct.

[0018] Further, the feeding assembly includes a heat conducting plate fixedly mounted on the lower mold, a buffer cylinder is rotatably mounted on the heat conducting plate, a sealing pressure plate is sealingly and slidably mounted on the buffer cylinder, a limited displacement opening is provided on the buffer cylinder, a baffle is fixedly mounted on the sealing pressure plate, and the baffle is sealingly and slidably mounted on the limited displacement opening, and one end of the baffle penetrates and is slidably mounted on the heat conducting plate, and a pressure plate is fixedly mounted on the baffle;

[0019] A threaded barrel is passed through and rotatably installed on the heat conduction plate, a threaded rod is threadedly installed on the threaded barrel, and the upper end of the threaded rod is fixedly connected to the pressure plate, a parallel axis gear is fixedly installed on the threaded barrel, a rotating gear meshing with the parallel axis gear is fixedly installed on the cache barrel, a ring-shaped and evenly distributed conduit is fixedly connected to the cache barrel, and a downward pressure component is installed on the fixed plate.

[0020] Furthermore, the pressing component includes a spring telescopic rod fixedly installed at the lower end of the fixed plate, and two spring telescopic rods are provided, and an extrusion plate is fixedly installed between the two spring telescopic rods.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] (1) This solution can drive the loose-leaf plate 1 and the corresponding loose-leaf plate 2 to move back and forth once before the upper mold and the lower mold are merged through the cooperation of the lifting assembly, multiple pressing plates and cleaning components to clean the inside of the corresponding exhaust holes. This can effectively improve the smoothness of the gas discharged through the multiple exhaust holes during the subsequent heating of the rubber material inside the lower mold. At the same time, when the upper mold moves down to pressurize the rubber material, the exhaust holes can be cleaned again through the cooperation of the lifting assembly, multiple pressing plates and cleaning components. This can further ensure the exhaust smoothness of the exhaust holes and effectively reduce the overflow of rubber material to block the exhaust holes, thereby reducing the exhaust speed of the exhaust holes. This helps to improve the overall strength and quality of the rubber seal finally made by vulcanization.

[0023] (2) This solution can achieve preheating treatment of the rubber and the lower mold through the cooperation of the heat conduction plate and the buffer cylinder, which can reduce the time required for subsequent heating of the rubber and increase the fluidity of the overall rubber, which helps the subsequent rubber to fill the lower mold more evenly and reduce the stress concentration and bubble generation caused by the poor fluidity of the rubber during the vulcanization process. At the same time, through the cooperation of the pressing component with the threaded rod and the threaded cylinder, the buffer cylinder can be rotated to inject the rubber into the lower mold, which helps to further improve the uniformity of the distribution of the rubber in the lower mold and further reduce the concentration of local stress during the subsequent heating of the rubber.

[0024] (3) This solution can accelerate the discharge of bubbles inside the rubber material by means of a knocking mechanism during the heating of the rubber material in the lower mold, thereby helping to reduce the concentration of internal stress in the final rubber seal and further improve the density and strength of the finished rubber seal. At the same time, the knocking mechanism can be used in conjunction with the exhaust components and the filter to accelerate the discharge of internal gas during the vulcanization of the rubber material in the lower mold, and the gas can be collected and purified. This can not only further improve the strength of the final rubber seal, but also achieve the effect of environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention;

[0026] Figure 2 for Figure 1 A schematic diagram of the structure of the middle lifting assembly;

[0027] Figure 3 for Figure 1 The structural diagram of the middle feeding component;

[0028] Figure 4 for Figure 3 A schematic cross-sectional view of the middle heat conducting plate and the buffer cylinder;

[0029] Figure 5 for Figure 4 A schematic cross-sectional view of the middle and lower molds;

[0030] Figure 6 for Figure 5 Schematic diagram of the structure after removing the lower mold;

[0031] Figure 7 for Figure 6 The schematic diagram of the structure after the middle rotating disk rotates a certain angle;

[0032] Figure 8 for Figure 5 The schematic diagram of the structure of the middle disc after being cut and rotated to a certain angle;

[0033] Fig. 9 for Figure 2 A schematic cross-sectional view of the middle and lower molds;

[0034] Fig.10 for Fig. 9 Schematic diagram of the components structure on the middle exhaust duct;

[0035] Fig.11 for Fig.10 An exploded schematic diagram of the middle support frame, loose-leaf board 1 and loose-leaf board 2;

[0036] Fig.12 for Figure 1 A schematic cross-sectional view of the middle and upper mold;

[0037] Fig.13 for Fig.12 Schematic diagram of the connection structure between the middle support roller and the pressing plate.

[0038] Description of the numbers in the figure:

[0039] 1. Base; 2. Lower mold;

[0040] 3. Lifting assembly; 31. Limiting cylinder; 32. Servo motor; 33. Reciprocating screw rod; 34. Sliding block; 35. Support rod;

[0041] 4. Fixed plate; 5. Upper mold; 6. Exhaust hole;

[0042] 7. Feeding assembly; 71. Spring telescopic rod; 72. Extrusion plate; 73. Heat conducting plate; 74. Buffer cylinder; 75. Sealing pressure plate; 76. Conduit; 77. Rotating gear; 78. Baffle; 79. Pressure plate; 710. Threaded cylinder; 711. Threaded rod; 712. Parallel shaft gear;

[0043] 8. Exhaust assembly; 81. Collection box; 82. Sealing cover; 83. Round rod; 84. Plate; 85. Motor; 86. Rotating disk; 87. Guide groove; 88. Push rod; 89. Wind shield; 810. Bracket; 811. Disc; 812. Cavity; 813. Push plate; 814. Knocking plate; 815. Piston; 816. One-way air supply pipe; 817. Slide; 818. One-way air suction pipe; 819. Exhaust pipe;

[0044] 9. Cleaning assembly; 91. Arc groove; 92. Round shaft one; 93. Round shaft two; 94. Support frame; 95. Moving groove; 96. Positioning plate; 97. Return spring; 98. Support plate; 99. Limiting plate; 910. Connecting piece; 911. Loose-leaf plate one; 912. Loose-leaf plate two; 913. Support roller; 914. Fixed plate; 915. Rotating shaft; 916. Pressing plate. DETAILED DESCRIPTION

[0045] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0046] See also Figures 1 to 13 A rubber seal heat-welding vulcanization mold comprises a base 1, a lower mold 2 is fixedly mounted on the base 1, a feeding component 7 is arranged on the lower mold 2, an exhaust component 8 is arranged on the base 1, and a cleaning component 9 is arranged on the lower mold 2;

[0047] A lifting assembly 3 is provided on the base 1, and a fixing plate 4 is installed through the lifting assembly 3, and an upper mold 5 is fixedly installed at the lower end of the fixing plate 4;

[0048] The exhaust assembly 8 includes a collecting box 81 fixedly mounted on the lower mold 2, and brackets 810 evenly distributed in a ring shape are fixedly mounted on the base 1. Discs 811 are fixedly mounted between the brackets 810, and a knocking mechanism is installed between the discs 811 and the lower mold 2. An exhaust component is installed on the disc 811, and an exhaust pipe 819 is fixedly connected to the disc 811.

[0049] The lower mold 2 is provided with exhaust holes 6 evenly distributed in a ring shape, and the cleaning component 9 includes movable grooves 95 evenly opened in a ring shape on the lower mold 2, and the movable grooves 95 are connected with the corresponding exhaust holes 6, and support frames 94 are slidably installed on the movable grooves 95, and one end of the support frames 94 is sealed and penetrated and slidably installed on the collection box 81, and cleaning components are installed between the support frames 94, and a support plate 98 is slidably installed on the exhaust pipe 819, and a connecting piece 910 is rotatably installed between the support frame 94 and the support plate 98, and a pressing component is installed at the lower end of the fixed plate 4.

[0050] like Figure 1 - Figure 4 , Fig.13 As shown, the lifting assembly 3 includes a limiting cylinder 31 fixedly mounted on the base 1, a servo motor 32 fixedly mounted on the base 1, a reciprocating screw 33 fixedly mounted on the driving end of the servo motor 32, a slider 34 mounted on the reciprocating screw 33 through a ball nut, a support rod 35 fixedly mounted on the slider 34, and a fixed plate 4 fixedly mounted on the lower end of the support rod 35.

[0051] The feeding assembly 7 includes a heat conducting plate 73 fixedly mounted on the lower mold 2, a buffer cylinder 74 is rotatably mounted on the heat conducting plate 73, a sealing pressure plate 75 is sealingly and slidably mounted on the buffer cylinder 74, a limited displacement opening is provided on the buffer cylinder 74, a baffle 78 is fixedly mounted on the sealing pressure plate 75, and the baffle 78 is sealingly and slidably mounted on the limited displacement opening, and one end of the baffle 78 penetrates and is slidably mounted on the heat conducting plate 73, and a pressure plate 79 is fixedly mounted on the baffle 78;

[0052] A threaded cylinder 710 passes through and is rotatably installed on the heat conducting plate 73, a threaded rod 711 is threadedly installed on the threaded cylinder 710, and the upper end of the threaded rod 711 is fixedly connected to the pressure plate 79, a parallel shaft gear 712 is fixedly installed on the threaded cylinder 710, a rotating gear 77 meshing with the parallel shaft gear 712 is fixedly installed on the cache cylinder 74, a ring-shaped and evenly distributed conduit 76 is fixedly connected to the cache cylinder 74, and a downward pressure component is installed on the fixed disk 4.

[0053] The pressing component includes a spring telescopic rod 71 fixedly mounted on the lower end of the fixed plate 4 . Two spring telescopic rods 71 ​​are provided, and a pressing plate 72 is fixedly mounted between the two spring telescopic rods 71 ​​.

[0054] When the equipment is needed to make rubber seals, the prepared rubber material is first input into the buffer cylinder 74 (the buffer cylinder 74 is provided with a feed pipe specifically for conveying the rubber material, which is not shown in the figure), and then the temperature control system in the lower mold 2 is started (the "temperature control system" is an existing mature technology, so it is not shown in the accompanying drawings. The temperature control system is usually composed of a heating device, a refrigeration device and a temperature controller. The temperature control system can be used to heat or cool the lower mold 2 as needed) to start preheating the lower mold 2.

[0055] During the process of heating the lower mold 2 by the temperature control system, the heat transferred to the buffer cylinder 74 through the heat conduction plate 73 can achieve the effect of preheating the rubber inside the buffer cylinder 74, which helps to improve the overall fluidity of the rubber, and is beneficial to ensure that the rubber fills the lower mold 2 more evenly in the future, thereby reducing the stress concentration phenomenon in the final rubber seal due to the poor fluidity of the rubber during the vulcanization process of the rubber, and effectively improving the strength of the rubber seal (the stress in the vulcanization process of the rubber will affect the internal cross-linking structure of the formed rubber seal, so the appropriate stress level helps to optimize the cross-linking reaction and improve the strength and durability of the rubber seal).

[0056] At the same time, the enhancement of the fluidity of the rubber can also help reduce the generation of bubbles during the subsequent injection of the rubber into the lower mold 2 (in the process of preheating the rubber, the air and volatile substances in the rubber can be effectively removed, thereby reducing the formation of bubbles in the rubber. The bubbles in the rubber will cause local stress concentration in the rubber, resulting in uneven stress distribution, reducing the density and overall strength of the rubber seal formed by vulcanization), which helps to further enhance the overall strength of the rubber seal formed by subsequent vulcanization.

[0057] In addition, by preheating the rubber material and the lower mold 2, the heating time required for the subsequent rubber material die-casting process can be effectively shortened, thereby reducing the production cycle of the rubber seal and effectively improving the production efficiency of the equipment.

[0058] When the temperature control system preheats the rubber material and the lower mold 2 to a certain temperature, the temperature control system can be stopped and the servo motor 32 can be started. At this time, the operation of the servo motor 32 will cooperate with the reciprocating screw 33, the ball nut, the slider 34, and the support rod 35 to make the fixed plate 4 drive the upper mold 5, the extrusion plate 72, and the plurality of pressing plates 916 to move downward (such as Figure 1 As shown in the direction, when the lower end of the extrusion plate 72 contacts the sealing plate 75 and is continuously moved downward (as shown in the direction shown in the figure), the lower end of the extrusion plate 72 contacts the sealing plate 75 and is continuously moved downward (as shown in the figure). Figure 1 The pressing plate 72 presses the sealing plate 75, so that the sealing plate 75 moves downward to squeeze the rubber material inside the buffer cylinder 74, and the pressed rubber material is injected into the lower mold 2 through a plurality of conduits 76 (as shown in FIG. Figure 4In the direction shown, and in this process, the sum of the friction resistance between the sealing pressure plate 75 and the buffer cylinder 74 and the resistance of the rubber to the extrusion plate 72 is less than the compression force of the two spring telescopic rods 71 ​​themselves, so as to ensure the effect of the extrusion plate 72 pressing the sealing pressure plate 75 to move downward together).

[0059] Valves (not shown) are installed on the multiple conduits 76. When the rubber material inside the buffer cylinder 74 is heated, the multiple valves are in a closed state. When the sealing pressure plate 75 begins to move downward under force, the multiple valves are in an open state (the overall fluidity of the rubber material is poor. Therefore, by applying a certain pressure to the rubber material inside the buffer cylinder 74, the output of the rubber material inside the buffer cylinder 74 can be accelerated).

[0060] At the same time, when the sealing pressing plate 75 moves downward to extrude the rubber material (such as Figure 4 The baffle plate 78 moves downward together with the pressure plate 79 and the threaded rod 711. During the downward movement of the threaded rod 711, the torque applied to the threaded barrel 710 and the friction between the threaded rod 711 and the threaded barrel 710 can cause the threaded barrel 710 to rotate. During the rotation of the threaded barrel 710, the parallel shaft gear 712 cooperates with the rotating gear 77, so that the buffer barrel 74 can drive the multiple conduits 76 to rotate and inject materials. This can further improve the uniformity of the distribution of the rubber material in the lower mold 2, further reduce the occurrence of local stress concentration of bubbles and uneven thickness, and help to improve the overall quality of the final rubber seal.

[0061] When the sealing pressing plate 75 squeezes the rubber material inside the buffer tube 74 into the lower mold 2, the lower end of the sealing pressing plate 75 contacts the inner bottom wall of the buffer tube 74 (such as Figure 4 As shown in the direction, since the resistance exerted by the buffer cylinder 74 on the extrusion plate 72 through the sealing pressure plate 75 is greater than the compression force of the two spring telescopic rods 71, the fixed plate 4 will drive the upper mold 5 and the plurality of pressing plates 916 to continue to move downward by compressing the two spring telescopic rods 71 ​​(as shown in the direction shown in the direction). Fig.13 until the lower end of the upper mold 5 blocks the upper end of the lower mold 2 (as shown in the direction of FIG. Figure 2 direction shown).

[0062] like Figure 1 , Figure 2 , Figure 5 - Figure 8As shown, the knocking mechanism includes a placement groove opened on the base 1, and a driving component is installed on the placement groove. Round rods 83 uniformly distributed in an annular shape are fixedly installed on the lower mold 2, and plates 84 are fixedly installed on the round rods 83. Cavities 812 uniformly distributed in an annular shape are opened on the disk 811. The disk 811 is provided with slide grooves 817 uniformly distributed in an annular shape, and the cavities 812 are connected with the corresponding slide grooves 817. Pistons 815 are sealed and slidably installed on the cavities 812, push plates 813 are fixedly installed on the pistons 815, and knocking plates 814 are fixedly installed on the push plates 813. Push rods 88 are fixedly installed on the lower ends of the push plates 813. Wind shields 89 are penetrated and fixedly installed on the push rods 88, and the wind shields 89 are sealed and slidably installed on the corresponding slide grooves 817.

[0063] The driving component includes a motor 85 fixedly mounted on the placement groove, a rotating disk 86 is fixedly mounted on the driving end of the motor 85, and the rotating disk 86 is provided with guide grooves 87 evenly distributed in an annular shape, and the lower ends of the push rods 88 are slidably mounted on the corresponding guide grooves 87.

[0064] The exhaust component includes annular grooves uniformly opened on the disc 811, and the grooves are connected to the corresponding cavities 812. One-way air supply pipes 816 are fixedly installed on the grooves, and a filter is fixedly installed in the exhaust pipe 819 (drawn but not marked in the figure, from Fig.10 As can be seen in the figure, the disc 811 is fixedly connected with a one-way suction pipe 818 which is evenly distributed in a ring shape, and one end of the one-way suction pipe 818 extends into the corresponding cavity 812, and the other end of the one-way suction pipe 818 is fixedly connected with the collection box 81, and a sealing cover 82 is sealed and installed on the collection box 81.

[0065] When the rubber material is completely injected into the lower mold 2 (the total height of the rubber material injected into the lower mold 2 each time must be lower than the multiple exhaust holes 6 to ensure the effect of exhausting the internal gas of the lower mold 2 through the exhaust holes 6), the lower end of the upper mold 5 is sealed against the upper end of the lower mold 2 (such as Figure 2 In the direction shown, first stop the operation of the servo motor 32, and restart the temperature control system, then the rubber material inside the lower mold 2 can be further heated. At the same time, in this process, start the motor 85. During the operation, the motor 85 will cause the rotating disk 86 to rotate alternately forward and reverse. During the process of the rotating disk 86 rotating alternately forward and reverse, the push and pull forces applied to the corresponding push rods 88 by the multiple guide grooves 87 can make the multiple push rods 88 cooperate to drive the multiple push plates 813 and the multiple knocking plates 814 to intermittently move away from and approach each other.

[0066] As the multiple knocking plates 814 move away from each other, the vibration force generated by the impact on the corresponding plate body 84 will be transmitted to the rubber through the cooperation of the multiple round rods 83 and the lower mold 2, which can help accelerate the discharge of bubbles generated in the rubber due to heating, thereby reducing the stress concentration of the rubber during continuous heating, thereby further improving the density and overall strength of the rubber seal made by vulcanization.

[0067] During the heating process of the rubber, factors such as the volatile gases produced and the chemical reactions of the rubber will cause bubbles to form in the rubber. If the bubbles continue to increase and are not exhausted in time, the strength of the rubber seals made by subsequent vulcanization will gradually decrease. Impacting the rubber can effectively promote the movement, rupture and discharge of the bubbles inside it, thereby helping to improve the strength of the final rubber seals (during the static heating of the rubber, the bubbles may adhere to the internal structure of the rubber to form a stable group of bubbles. This stability will be broken by the impact, thereby reducing the adhesion between the bubbles and the rubber matrix, making it easier for the bubbles to be discharged. At the same time, the mechanical force generated by the impact can rupture the bubbles in the rubber, compressing and expanding the bubbles, thereby destroying the structure of the bubbles and making them easier to discharge).

[0068] Since harmful gases are generated during the heating of the rubber material, the gases generated during the heating of the rubber material can be buffered by the collecting box 81 so as to be discharged from the plurality of exhaust holes 6 .

[0069] At the same time, in the process of multiple push rods 88 cooperating to drive multiple push plates 813 and knocking plates 814 to move away from each other, multiple pistons 815 will be driven to move away from each other. In the process of multiple pistons 815 gradually moving away from the corresponding one-way air supply pipes 816, the suction force generated can suck the gas buffered inside the collection box 81 into the multiple cavities 812 through the corresponding one-way suction pipes 818, and in this process, the efficiency of gas discharge from the lower mold 2 can be effectively improved, thereby reducing the possibility of bubble formation during continuous heating of the rubber material, further ensuring the density and strength of the rubber seal manufactured. In addition, accelerating the discharge of gas from the lower mold 2 can also help reduce gas obstruction in the rubber material, allowing it to reach a solidified state faster, thereby effectively shortening the production cycle and improving the production efficiency of the equipment.

[0070] When multiple push rods 88 cooperate to drive multiple push plates 813 and pistons 815 to approach each other, the operation of the piston 815 will squeeze the gas between the piston 815 and the corresponding one-way air supply pipe 816 into the exhaust pipe 819 through the corresponding one-way air supply pipe 816, and after being filtered and purified by the filter, it is discharged from the exhaust pipe 819 (the filter is an existing gas filtering equipment, which uses a multi-layer filter medium to ensure that particles of different particle sizes can be effectively intercepted). In this way, the effect of gas purification can be achieved during the heating process of the rubber, thereby protecting the environment.

[0071] The purpose of setting the wind shield 89 is to facilitate the push rod 88 to push the push plate 813 and the piston 815 to move. The cavity 812 is connected to the corresponding slide groove 817. Therefore, when the push rod 88 is forced to push the piston 815 to move, the position between the corresponding cavity 812 and the groove is blocked by the corresponding wind shield 89, which can effectively ensure that during the force displacement of the piston 815, air can only be sucked in through the one-way suction pipe 818, and the gas in the cavity 812 can only be discharged through the one-way air supply pipe 816.

[0072] like Figure 1 , Figure 2 , Figure 6 , Fig. 9 - Fig.13 As shown, the cleaning components include loose-leaf plates 911 rotatably mounted on support frames 94, on which circular shafts 92 are fixedly mounted, loose-leaf plates 912 are rotatably mounted on support frames 94, on which circular shafts 93 are fixedly mounted, and a plurality of arc grooves 91 are provided on the lower mold 2, and the arc grooves 91 are connected to corresponding movable grooves 95.

[0073] The pressing component includes a supporting roller 913 fixedly mounted on the lower end of the fixed disk 4, and there are two supporting rollers 913. A fixing plate 914 is fixedly mounted on each supporting roller 913, and there are two fixing plates 914. A rotating shaft 915 is rotatably mounted on each fixing plate 914, and a torsion spring (drawn in the figure but not marked) is fixedly mounted between the rotating shaft 915 and the corresponding fixing plate 914, a rod body is fixedly mounted on each fixing plate 914, a friction plate (drawn in the figure but not marked) matching the corresponding rotating shaft 915 is fixedly mounted on the rod body, and a pressing plate 916 is fixedly mounted on the rotating shaft 915.

[0074] A positioning plate 96 is fixedly mounted on the exhaust duct 819 , and return springs 97 evenly distributed in a ring shape are fixedly mounted on the positioning plate 96 , and the return springs 97 are fixedly connected to the support plate 98 . A limited displacement plate 99 is fixedly mounted on the exhaust duct 819 .

[0075] Before the lower end of the upper mold 5 blocks the upper end of the lower mold 2 (such as Figure 2 The two pressing plates 916 located at the bottom will first contact the support plate 98 (from Fig.12 As can be seen in FIG. 1 , the height of the two pressing plates 916 below the displacement is lower than the lower end of the upper mold 5 ), and a downward pressing force is applied thereto, so that the support plate 98 begins to move downward (as shown in FIG. 1 ). Fig.10 direction shown).

[0076] During the downward movement of the support plate 98, the plurality of connecting members 910 cooperate with the support plate 98, so that the plurality of support frames 94 can drive the corresponding loose-leaf plates 1 911 and loose-leaf plates 2 912 to approach each other, and when the loose-leaf plates 1 911 and loose-leaf plates 2 912 begin to be displaced by force, the normal force applied by the two adjacent arc-shaped grooves 91 to the corresponding circular shafts 1 92 and 2 93 will cause the circular shafts 1 92 and 2 93 to move along the arc-shaped trajectory of the arc-shaped grooves 91, and in the process of displacement, the circular shafts 1 92 and 2 93 will move along the arc-shaped trajectory of the arc-shaped grooves 91. The shaft 1 92 and the circular shaft 2 93 perform relative rotational motion, and during the relative rotation of the circular shaft 1 92 and the circular shaft 2 93, the corresponding loose-leaf plates 1 911 and the loose-leaf plates 2 912 are driven to rotate and unfold relative to each other, until the two loose-leaf plates 1 911 and the loose-leaf plates 2 912 rotate to a horizontal state, and during the relative rotation and unfolding of the loose-leaf plates 1 911 and the corresponding loose-leaf plates 2 912, impurities at the end of the corresponding exhaust hole 6 (i.e., the side close to the inner wall of the lower mold 2) can be gathered and scraped off;

[0077] When the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 rotate relative to each other to a horizontal state, the support frame 94 is notified of the continuous displacement of the force, so that the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 cooperate to push the gathered impurities until the impurities are discharged from the corresponding exhaust holes 6 and fall into the collection box 81 under the action of gravity (a plurality of one-way suction pipes 818 are located at one end of the collection box 81 and are all arranged at the upper end of the collection box 81, from Figure 6 It can be seen that the purpose is to ensure that the impurities gathered inside the collection box 81 will not hinder the air suction of the one-way suction pipe 818. In addition, the sealing cover 82, which is easy to install and disassemble, can facilitate the staff to regularly clean the impurities collected inside the collection box 81, so as to ensure the cleanliness of the inside of the collection box 81). This can effectively ensure that when the lower mold 2 is heating the internal rubber material, the gas is discharged smoothly through the multiple exhaust holes 6, and further ensure the overall strength of the rubber seal made later.

[0078] After the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 are relatively rotated and expanded, the sum of their diameters is equal to the aperture of the corresponding exhaust hole 6, thereby effectively ensuring the effect of cleaning the inside of the corresponding exhaust hole 6 during the process of the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 being relatively rotated, expanded and displaced. At the same time, the arc-shaped ends of the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 are both provided with a certain elasticity, so as to ensure that when the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 are relatively rotated under force and contact the inner wall of the exhaust hole 6, the arc-shaped ends of the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 can be deformed under force, thereby effectively reducing the obstruction of the inner wall of the exhaust hole 6 to the movement of the two.

[0079] The friction force between the friction plate and the corresponding rotating shaft 915 is set to be relatively large (the friction plate and the corresponding rod body are fixedly connected by adhesion, so that the user can choose the friction coefficient of the friction plate according to the actual needs of the equipment). The purpose is to ensure that when the pressing plate 916 starts to press the support plate 98 and drive it to move downward, the sum of the elastic deformation force required by the multiple reset springs 97 and the movement resistance of the multiple support frames 94 to drive the loose-leaf plates 1 911 and the loose-leaf plates 2 912 thereon is less than the friction resistance of the corresponding friction plate to the rotating shaft 915, ensuring that when the pressing plate 916 starts to press the support plate 98 downward, the support plate 98 can compress the multiple reset springs 97 to drive the multiple support frames 94 to move closer to each other.

[0080] When the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 cooperate to clean the inside of the corresponding exhaust hole 6, the pressing force of the support plate 98 on the return spring 97 reaches the maximum compression amount of the multiple return springs 97. At this time, the positioning plate 96 is displaced by the resistance of the two pressing plates 916 below the multiple return springs 97 and the support plate 98 (such as Fig.12 The friction resistance of the corresponding friction plate to the rotating shaft 915 is greater than that of the corresponding friction plate. Therefore, the reaction force exerted by the support plate 98 on the two pressing plates 916 below the displacement will cause the two pressing plates 916 to rotate upward relative to each other (as shown in FIG. Fig.12 When the two pressing plates 916 at the bottom continue to move downward and rotate to a vertical state, the support plate 98 can be quickly moved upward and reset (as shown in the direction) under the elastic force of the multiple reset springs 97. Fig.10 direction shown).

[0081] During the process of the support plate 98 rapidly moving upward and resetting, the plurality of connecting members 910 cooperate with the plurality of support frames 94 to enable the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 to move and reset, and during the process of moving and resetting, the normal force applied by the two adjacent arc-shaped grooves 91 to the corresponding circular shaft 1 92 and the circular shaft 2 93 can enable the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 to rotate and merge relative to each other (such as Fig.10The state shown) is to ensure that the exhaust hole 6 is effective in exhausting the gas inside the lower mold 2 (when the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 cooperate to clean the exhaust hole 6, the exhaust hole 6 is in a blocked state and cannot exhaust the gas normally).

[0082] When the support plate 98 moves upward and resets, the resistance exerted by the two pressing plates 916 below the displacement disappears (such as Fig.12 In the direction shown), under the action of the elastic deformation force of the corresponding torsion spring itself, the rotating shaft 915 can drive the corresponding pressing plate 916 to rotate and reset.

[0083] When the plurality of support frames 94 are forced to move closer to each other, the spring (from the support frame 94 to the collection box 81) is arranged between the support frame 94 and the collection box 81. Fig.11 As can be seen in the figure, the horizontality of the movement of the plurality of support frames 94 under force can be effectively ensured, and the stability of the horizontal movement of the loose-leaf plate 1 911 and the loose-leaf plate 2 912 thereon driven by the support frame 94 under force can be ensured.

[0084] When the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 move back and forth once and complete the cleaning of the corresponding exhaust hole 6, the fixed plate 4 just drives the upper mold 5 to move down to the upper end of the lower mold 2 to complete the plugging of the upper end of the lower mold 2 (such as Figure 2 In the direction shown), at this time, the rubber material inside the lower mold 2 can be continuously heated by the continuous operation of the temperature control system inside the lower mold 2.

[0085] When the rubber material inside the lower mold 2 is heated to an appropriate temperature, the servo motor 32 is started again. Through the continuous operation of the servo motor 32, the fixed plate 4 can be driven to drive the upper mold 5 to move downward to apply pressure to the rubber material inside the lower mold 2 until the rubber material inside the lower mold 2 is completely cured.

[0086] In the process that the fixed plate 4 drives the upper mold 5 and the plurality of pressing plates 916 to continuously move downward, the two pressing plates 916 located at the top will press the support plate 98 again (such as Fig.10 , Fig.12In the direction shown in the figure, at this time, through the cooperation of the positioning plate 96, multiple return springs 97, the limit plate 99, multiple connecting parts 910, and multiple support frames 94, the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 can be reciprocated to one side again to clean the corresponding exhaust holes 6, so as to ensure that the lower mold 2 can exhaust smoothly through the multiple exhaust holes 6 during the process of the upper mold 5 applying pressure to the rubber material (to facilitate the subsequent demoulding of the rubber seal and reduce the rubber material overflowing from the lower mold during the process of the upper mold 5 applying pressure to the rubber material inside the lower mold 2). 2. The diameter of the upper mold 5 needs to be slightly smaller than the inner diameter of the lower mold 2. The diameter difference between the two is usually between 0.1 and 0.5 mm. If the rubber overflows from the lower mold 2 and blocks the multiple exhaust holes 6 during the rubber pressure application process of the upper mold 5, the corresponding exhaust holes 6 can be cleaned by the loose-leaf plate 1 911 and the loose-leaf plate 2 912. This can effectively ensure the smoothness of the exhaust of the multiple exhaust holes 6 during the continuous pressure application of the rubber by the upper mold 5 when it moves downward, further ensuring the strength and overall quality of the rubber seals subsequently manufactured.

[0087] The purpose of opening two square holes on the disk 811 is (from Figure 8 As can be seen in the figure, when the fixed plate 4 drives the upper mold 5 and the multiple pressing plates 916 to move continuously downward, the two pressing plates 916 located at the bottom will enter the two square holes, thereby effectively preventing the two pressing plates 916 located at the bottom from hindering the movement of the upper mold 5 when the upper mold 5 continues to move downward to apply pressure to the rubber material.

[0088] When the rubber material inside the lower mold 2 is vulcanized ("vulcanization" refers to the process of reacting the sulfur and other chemical substances in the rubber material by heating to form a cross-linked structure. Vulcanization changes the rubber material from a soft material to a solid material with elasticity and strength), the temperature control system can be used to cool the lower mold 2. After the cooling of the lower mold 2 is completed, the cured rubber seal can be taken out of the lower mold 2.

[0089] Instructions for use: When the equipment is needed to make rubber density parts, first start the temperature control system in the lower mold 2, and start preheating the rubber in the lower mold 2 and the buffer cylinder 74, so as to enhance the fluidity of the subsequent rubber in the lower mold 2 and reduce the generation of bubbles in the rubber. Then start the servo motor 32. At this time, the operation of the servo motor 32 will drive the fixed plate 4 to drive the upper mold 5, the extrusion plate 72 and multiple pressing plates 916 to move downward synchronously. In the process of continuous downward movement of the extrusion plate 72, the rubber in the buffer cylinder 74 will be squeezed into the lower mold 2 through cooperation with the sealing pressure plate 75. In this process, through the cooperation of the baffle 78, the threaded rod 711 and the threaded cylinder 710, the buffer cylinder 74 can be driven to rotate and the internal rubber can be evenly injected into the lower mold 2.

[0090] When the rubber material in the buffer cylinder 74 is completely injected into the lower mold 2, the fixing plate 4 will press the two spring telescopic rods 71 ​​to drive the upper mold 5 to continue to move downward until the lower end of the upper mold 5 blocks the upper end of the lower mold 2 (such as Figure 2 The servo motor 32 is then stopped, and the motor 85 is started, and the rubber material inside the lower mold 2 is continuously heated by the temperature control system. The operation of the motor 85 cooperates with the knocking mechanism so that the multiple knocking plates 814 intermittently knock the corresponding plate bodies 84. The vibration force generated in this process can help to accelerate the discharge of bubbles generated in the process of heating the rubber material. At the same time, the knocking mechanism can accelerate the discharge of gas and bubbles generated in the process of heating the rubber material by the lower mold 2. The exhaust component and the filter can cooperate to collect and purify this part of the gas.

[0091] At the same time, before the upper mold 5 seals the upper end of the lower mold 2, through the two pressing plates 916 that are continuously forced to move downward and are located at the lower end, in cooperation with the support plate 98, multiple connecting parts 910 and multiple support frames 94, the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 can move back and forth once to clean the inside of the corresponding exhaust hole 6, and the cleaned impurities are gathered and pushed into the collection box 81, thereby effectively improving the smoothness of gas discharge during the heating of the internal rubber material of the lower mold 2.

[0092] When the rubber material inside the lower mold 2 is heated to an appropriate temperature, the upper mold 5 can be continuously moved downward by starting the servo motor 32 again to apply pressure to the rubber material inside the lower mold 2. During this process, two pressing plates 916 that are continuously forced to move downward and are located at the upper end cooperate with the support plate 98, multiple connecting parts 910 and multiple support frames 94 to make the loose-leaf plate 1 911 and the corresponding loose-leaf plate 2 912 move back and forth once, and clean the inside of the corresponding exhaust hole 6 again, thereby further ensuring the smoothness of the exhaust of the lower mold 2 through the exhaust hole 6 and reducing the risk of the rubber material blocking the exhaust hole 6.

[0093] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rubber seal heat-welding vulcanization mold, comprising a base (1), a lower mold (2) fixedly mounted on the base (1), a material feeding component (7) disposed on the lower mold (2), an exhaust component (8) disposed on the base (1), and a cleaning component (9) disposed on the lower mold (2); Features: The base (1) is provided with a lifting assembly (3), and a fixed plate (4) is installed through the lifting assembly (3), and an upper mold (5) is fixedly installed at the lower end of the fixed plate (4); The exhaust assembly (8) comprises a collection box (81) fixedly mounted on the lower mold (2); brackets (810) evenly distributed in a ring shape are fixedly mounted on the base (1); a disc (811) is fixedly mounted between the brackets (810); a knocking mechanism is installed between the disc (811) and the lower mold (2); an exhaust component is installed on the disc (811); and an exhaust pipe (819) is fixedly connected to the disc (811); The lower mold (2) is provided with annularly evenly distributed exhaust holes (6); the cleaning component (9) includes annularly evenly distributed movable grooves (95) on the lower mold (2), and the movable grooves (95) are all connected to the corresponding exhaust holes (6); a support frame (94) is slidably mounted on the movable grooves (95), and one end of the support frame (94) is sealed and penetrated and slidably mounted on the collection box (81); a cleaning component is commonly mounted between the support frames (94); a support plate (98) is slidably mounted on the exhaust pipe (819); a connecting piece (910) is rotatably mounted between the support frame (94) and the support plate (98); and a pressing component is mounted at the lower end of the fixed plate (4).

2. A rubber seal heat-welding vulcanization mold according to claim 1, Features: The lifting assembly (3) comprises a limiting cylinder (31) fixedly mounted on a base (1); a servo motor (32) fixedly mounted on the base (1); a reciprocating screw rod (33) fixedly mounted on the driving end of the servo motor (32); a slider (34) mounted on the reciprocating screw rod (33) via a ball nut; a support rod (35) fixedly mounted on the slider (34); and a fixed plate (4) fixedly mounted on the lower end of the support rod (35).

3. A rubber seal heat-welding vulcanization mold according to claim 1, Features: The knocking mechanism comprises a placement groove provided on the base (1), a driving component is installed on the placement groove, round rods (83) uniformly distributed in an annular shape are fixedly installed on the lower mold (2), a plate body (84) is fixedly installed on the round rods (83), a cavity (812) uniformly distributed in an annular shape is provided on the disc (811), a slide groove (817) uniformly distributed in an annular shape is provided on the disc (811), and the cavity (812) is connected to the corresponding slide groove (817), a piston (815) is sealed and slidably installed on the cavity (812), a push plate (813) is fixedly installed on the piston (815), and a knocking plate (814) is fixedly installed on the push plate (813); A push rod (88) is fixedly installed at the lower end of the push plate (813), and a windshield plate (89) passes through and is fixedly installed on the push rod (88), and the windshield plate (89) is sealed and slidably installed on the corresponding slide groove (817).

4. A rubber seal heat-welding vulcanization mold according to claim 3, Features: The driving component comprises a motor (85) fixedly mounted on the placement groove, a rotating disk (86) is fixedly mounted on the driving end of the motor (85), the rotating disk (86) is provided with guide grooves (87) evenly distributed in an annular shape, and the lower ends of the push rods (88) are slidably mounted on the corresponding guide grooves (87).

5. A rubber seal heat-welding vulcanization mold according to claim 3, Features: The exhaust component comprises grooves that are evenly distributed in an annular shape on the disc (811), and the grooves are all connected to the corresponding cavities (812). One-way air supply pipes (816) are fixedly installed on the grooves, and a filter is fixedly installed in the exhaust pipe (819). One-way air suction pipes (818) that are evenly distributed in an annular shape are fixedly connected to the disc (811), and one end of the one-way air suction pipe (818) extends into the corresponding cavity (812), and the other end of the one-way air suction pipe (818) is fixedly connected to the collection box (81), and a sealing cover (82) is sealed and mounted on the collection box (81).

6. A rubber seal heat-welding vulcanization mold according to claim 1, Features: The cleaning components include loose-leaf plates (911) rotatably mounted on support frames (94), on which circular shafts (92) are fixedly mounted, and loose-leaf plates (912) rotatably mounted on support frames (94), on which circular shafts (93) are fixedly mounted, and a plurality of arc grooves (91) are provided on the lower mold (2), and the arc grooves (91) are all connected to corresponding movable grooves (95).

7. A rubber seal heat-welding vulcanization mold according to claim 1, Features: The pressing component comprises a supporting roller (913) fixedly mounted on the lower end of the fixed disk (4), wherein two supporting rollers (913) are provided, and a fixing plate (914) is fixedly mounted on each supporting roller (913), and two fixing plates (914) are provided, and a rotating shaft (915) is rotatably mounted on each fixing plate (914), and a torsion spring is fixedly mounted between the rotating shaft (915) and the corresponding fixing plate (914), and a rod body is fixedly mounted on each fixing plate (914), and a friction plate matched with the corresponding rotating shaft (915) is fixedly mounted on each rod body, and a pressing plate (916) is fixedly mounted on each rotating shaft (915).

8. A rubber seal heat-welding vulcanization mold according to claim 1, Features: A positioning plate (96) is fixedly mounted on the exhaust pipe (819), and return springs (97) evenly distributed in an annular shape are fixedly mounted on the positioning plate (96), and the return springs (97) are fixedly connected to the support plate (98), and a limited displacement plate (99) is fixedly mounted on the exhaust pipe (819).

9. A rubber seal heat-welding vulcanization mold according to claim 1, Features: The feeding assembly (7) comprises a heat conducting plate (73) fixedly mounted on the lower mold (2), a buffer cylinder (74) rotatably mounted on the heat conducting plate (73), a sealing pressure plate (75) sealingly and slidably mounted on the buffer cylinder (74), a limited displacement opening being provided on the buffer cylinder (74), a baffle (78) fixedly mounted on the sealing pressure plate (75), the baffle (78) sealingly and slidably mounted on the limited displacement opening, one end of the baffle (78) penetrates and is slidably mounted on the heat conducting plate (73), and a pressure plate (79) fixedly mounted on the baffle (78); A threaded barrel (710) is passed through and rotatably mounted on the heat conducting plate (73); a threaded rod (711) is threadedly mounted on the threaded barrel (710); and the upper end of the threaded rod (711) is fixedly connected to the pressure plate (79); a parallel axis gear (712) is fixedly mounted on the threaded barrel (710); a rotating gear (77) meshing with the parallel axis gear (712) is fixedly mounted on the cache barrel (74); a conduit (76) evenly distributed in an annular shape is fixedly connected to the cache barrel (74); and a pressing component is mounted on the fixed plate (4).

10. A rubber seal heat-welding vulcanization mold according to claim 9, Features: The pressing component comprises a spring telescopic rod (71) fixedly mounted on the lower end of the fixed plate (4), two spring telescopic rods (71) are provided, and a pressing plate (72) is fixedly mounted between the two spring telescopic rods (71).

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