Silicone rubber injection molding machine and molding method

Abstract

The invention belongs to the technical field of injection molding machines, and particularly relates to a silicone rubber injection molding machine which comprises a machining table, a lower mold is fixedly connected to the upper portion of the machining table, an upper mold is arranged above the lower mold, and an air cylinder for driving the upper mold to slide in the vertical direction is arranged above the machining table. And the guide mechanism comprises two guide rods fixedly connected to the upper end of the machining table, each guide rod is sleeved with a sliding sleeve, the upper end of the upper mold is fixedly connected with a bearing plate, and the two sliding sleeves are rotationally connected to the bearing plate. By arranging the guide mechanism, the guide mechanism can be automatically lubricated during working each time, the operation resistance of the sliding sleeve and the guide rod is reduced, and the sliding sleeve and the guide rod are prevented from being abraded; by arranging the detection assembly, the injection speed can be automatically adjusted according to the fluidity of the silicone rubber raw material, and the processing precision and the processing efficiency during silicone rubber injection molding are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molding machines, and in particular relates to a silicone rubber injection molding machine and a molding method. Background Art

[0002] Silicone rubber is a synthetic rubber based on siloxane (silicon oxide group). It has the characteristics of high temperature resistance, low temperature resistance, excellent electrical insulation, and oxidation resistance, so it is widely used in various application fields such as electronics, electrical, and medical.

[0003] In the production and processing of silicone rubber, the material needs to be heated and injected into the mold by an injection molding machine to produce various silicone rubber products. For example, a silicone rubber injection molding machine disclosed in China with a publication number of CN206030380U includes a base, an upper mold, a lower mold, a clamping cylinder and an injection device. The base is provided with a lower mold, and columns are provided at the four corners of the base. The upper mold is sleeved on the columns, and a support plate is provided above the columns. The clamping cylinder and the injection device are provided on the support plate. The injection device is connected to the upper mold. The above-mentioned injection molding machine can reduce the workload of the clamping cylinder through the pressure generated by its own weight, thereby achieving the purpose of saving energy.

[0004] However, the above silicone rubber injection molding machine still has the following technical problems when in use: Silicone rubber injection molding machines are usually equipped with guide mechanisms (such as guide pins and guide sleeves) to prevent the mold from deviating during the injection molding process. However, these guide mechanisms cannot be self-lubricated during use. After long-term use, the friction in the guide mechanism will cause the guide pins or guide sleeves to wear, causing the mold to easily deviate during the injection molding process, reducing the accuracy and consistency of the product; During the injection process, the injection speed cannot be adjusted according to the fluidity of the raw materials. When the fluidity of the raw materials is good, a slower injection speed will lead to insufficient pressure inside the mold, affecting the density and strength of the final product, while reducing the injection efficiency. When the fluidity of the raw materials is poor, a faster injection speed will cause the silicone rubber raw materials to flow unevenly in the mold, resulting in local unfilled defects, making it impossible to guarantee processing accuracy and processing efficiency; Therefore, a silicone rubber injection molding machine is urgently needed to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to address the problems raised in the above-mentioned background technology and to provide a silicone rubber injection molding machine and molding method that can automatically lubricate the guide mechanism each time it works, reduce the operating resistance of the sliding sleeve and the guide rod, and automatically adjust the injection speed according to the fluidity of the silicone rubber raw material, thereby improving the processing accuracy and processing efficiency during silicone rubber injection molding.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A silicone rubber injection molding machine, comprising: A processing table, a lower mold is fixedly connected to the top of the processing table, an upper mold is arranged above the lower mold, and a cylinder for driving the upper mold to slide in a vertical direction is arranged above the processing table; The guide mechanism comprises two guide rods fixedly connected to the upper end of the processing table, each of the guide rods is sleeved with a sliding sleeve, the upper end of the upper mold is fixedly connected to a carrying plate, the two sliding sleeves are rotatably connected to the carrying plate, a through hole is provided on the side wall of each sliding sleeve, two lubrication boxes are fixedly connected to the upper end of the carrying plate, a lubrication channel connected to the interior of the two lubrication boxes is provided in the carrying plate, the bottom end of each sliding sleeve is fixedly connected to an L-shaped rod, the bottom of each L-shaped rod is rotatably connected to a guide wheel, two spiral guide rails matching the guide wheels are fixedly connected to the processing table, and each of the spiral guide rails is divided into a spiral section and a straight section.

[0007] Preferably, a stop block is fixedly connected to the lower end of the bearing plate, and a first spring is provided between the sliding sleeve and the stop block.

[0008] Preferably, when the guide wheel moves from the spiral section to the straight section, the through hole on the sliding sleeve rotates to correspond to the lubrication channel.

[0009] Preferably, it also includes an injection mechanism, which includes an injection cylinder fixedly connected to the upper end of the carrying plate, the upper end of the processing table is fixedly connected to a liquid storage tank, the upper end of the liquid storage tank is connected to an infusion tube, the other end of the infusion tube is connected to the injection cylinder, the side wall of the injection cylinder is connected to an injection tube, the other end of the injection tube is connected to the interior of the upper mold, and a one-way valve is provided in both the infusion tube and the injection tube, the injection cylinder is sealingly and slidingly connected with a piston plate, an extension rod is fixedly connected to the piston plate, the part of the extension rod extending outside the injection cylinder is rotatably connected to an abutment wheel, the upper end of the carrying plate is slidably connected to a sliding block, a reciprocating screw is rotatably connected above the carrying plate, a first motor for driving the reciprocating screw is provided above the carrying plate, a hydraulic telescopic rod is fixedly connected to the sliding block, the telescopic end of the hydraulic telescopic rod is fixedly connected to a triangular abutment plate, and the triangular abutment plate rolls in contact with the abutment wheel.

[0010] Preferably, it also includes a stirring assembly arranged inside the liquid storage tank, the stirring assembly includes a rotating rod rotatably connected to the inside of the liquid storage tank, the lower end of the processing table is fixedly connected to a second motor for driving the rotating rod, and a plurality of stirring blades are fixedly connected to the rotating rod. A detection assembly is provided between the liquid storage tank and the hydraulic telescopic rod, and the detection assembly is used to detect the fluidity of the silicone rubber and adjust the injection mechanism according to the fluidity of the silicone rubber.

[0011] Preferably, the detection assembly includes a rotating ring rotatably connected to the inner wall of the liquid storage tank, the upper end of the rotating ring is fixedly connected to a transmission ring, the transmission ring is sealingly rotatably connected to the upper wall of the liquid storage tank, the top of the transmission ring is fixedly connected to a gear ring, the upper end of the processing table is rotatably connected to a transmission rod, the transmission rod is fixedly connected to a gear meshing with the gear ring, the top of the transmission rod is fixedly connected to a control block, a control cavity is defined in the control block, a plurality of slide grooves are defined on the peripheral side walls of the control cavity, a piston block is slidably connected in each of the slide grooves, a second spring is provided between each of the piston blocks and the inner wall of the slide groove, the upper end of the control block is sealingly rotatably connected to a hydraulic hose, the hydraulic hose connects the control cavity and the hydraulic telescopic rod.

[0012] Preferably, when the plurality of stirring blades stir the silicone rubber, the greater the fluidity of the silicone rubber, the smaller the rotation speed of the rotating ring.

[0013] A molding method applied to the silicone rubber injection molding machine comprises the following steps: S1. Mold closing process: Before injection, the upper mold is driven downward by the cylinder to fit the upper mold with the lower mold. During this process, the upper mold is guided by the sliding sleeve and the guide rod. S2. Self-lubricating treatment: During the film closing process, when the upper mold moves down to fit with the lower mold, the guide wheel first moves along the spiral section of the spiral guide track, so that the sliding sleeve rotates relative to the bearing plate until the through hole on the sliding sleeve corresponds to the lubrication channel. At this time, the guide wheel moves along the straight section of the spiral guide track, and the lubricating oil in the lubrication box flows into the space between the sliding sleeve and the guide rod through the lubrication channel and the through hole, so as to lubricate the space between the sliding sleeve and the guide rod, and automatically lubricate the guide mechanism during each operation; S3, injection processing: during injection, the reciprocating screw is driven to rotate by the first motor to realize the reciprocating translation of the sliding block, and the abutment wheel is further lifted up reciprocatingly by the hydraulic telescopic rod and the triangular abutment plate, so that the piston plate is reciprocated upwardly displaced, and reciprocated downwardly displaced back to the initial position under the action of gravity. The reciprocating movement of the piston plate in the injection barrel allows the silicone rubber raw material in the liquid storage tank to continuously enter the injection barrel through the infusion tube, and is continuously discharged into the cavities of the upper mold and the lower mold through the injection tube. The height of the triangular abutment plate is controlled by the hydraulic telescopic rod to adjust the injection speed; S4. Fluidity detection: During injection, the rotating rod is driven to rotate by the second motor, and then the silicone rubber raw material in the liquid storage tank is stirred by the stirring blades. At the same time, the shear stress of the silicone rubber raw material will drive the rotating ring to rotate. When the fluidity of the silicone rubber raw material is strong, the hydraulic telescopic rod maintains the triangular abutment plate at a higher position. When the fluidity of the silicone rubber raw material is strong, the injection speed is correspondingly increased. When the fluidity of the silicone rubber raw material is weak, the hydraulic oil in the hydraulic telescopic rod is less, and the triangular abutment plate is maintained at a lower position. When the fluidity is weak, a slower injection speed is applied.

[0014] Compared with the existing technology, the advantages of this silicone rubber injection molding machine and molding method are: 1. The present invention sets a guide mechanism. When the upper mold moves down to fit with the lower mold, the guide wheel first moves along the spiral section of the spiral guide track, so that the sleeve rotates relative to the carrier plate until the through hole on the sleeve corresponds to the lubrication channel. At this time, the guide wheel moves along the straight section of the spiral guide track, and the lubricating oil in the lubrication box flows into the space between the sleeve and the guide rod through the lubrication channel and the through hole, so as to lubricate the space between the sleeve and the guide rod. The guide mechanism can be automatically lubricated during each operation, thereby reducing the operating resistance of the sleeve and the guide rod, reducing the heat generated by friction, preventing the sleeve and the guide rod from wearing, ensuring the centering and stability of the upper mold and the lower mold during the injection process, improving the product quality, and at the same time, no manual lubrication is required by the staff, and the operation is convenient.

[0015] 2. The present invention sets an injection mechanism. When the first motor drives the reciprocating screw to rotate to realize the suction and injection of the raw material, the height of the triangular abutment plate can be adjusted by the hydraulic telescopic rod. The different heights of the triangular abutment plate can make the inclined surface push the guide wheel upward by different distances, thereby realizing the adjustment of the raw material suction rate and then adjusting the injection speed. The injection speed can be adjusted according to the actual situation.

[0016] 3. The present invention sets a detection component. When the stirring blades stir the silicone rubber raw material, the shear stress of the silicone rubber raw material will drive the rotating ring to rotate. When the fluidity of the silicone rubber raw material is strong, the hydraulic telescopic rod maintains the triangular abutment plate at a higher position, and the injection speed is correspondingly increased to avoid insufficient pressure inside the mold, which affects the density and strength of the final product and improves production efficiency. When the fluidity of the silicone rubber raw material is weak, the hydraulic telescopic rod maintains the triangular abutment plate at a lower position and applies a slower injection speed to avoid uneven flow of the silicone rubber in the mold due to excessive injection speed, resulting in local unfilled or defects. The injection speed can be automatically adjusted according to the fluidity of the silicone rubber raw material, thereby improving the processing accuracy and efficiency during silicone rubber injection molding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional structural schematic diagram of the present invention; Figure 2 It is a partial cross-sectional view of the guide mechanism in the present invention; Figure 3 yes Figure 2 The enlarged view of point A in the middle; Figure 4 It is a partial cross-sectional view of the injection mechanism and the stirring mechanism in the present invention; Figure 5 yes Figure 4 The enlarged view of point B in the middle; Figure 6 yes Figure 4 Enlarged view of point C in the middle; Figure 7 It is a work flow chart of the present invention.

[0018] In the figure: 1, processing table; 11, lower mold; 12, upper mold; 13, cylinder; 2, guide mechanism; 21, guide rod; 22, sliding sleeve; 23, bearing plate; 24, through hole; 25, lubrication box; 26, lubrication channel; 27, L-shaped rod; 28, guide wheel; 29, spiral guide track; 210, spiral section; 211, straight section; 212, stop block; 213, first spring; 3, injection mechanism; 31, injection barrel; 32, liquid storage tank; 33, infusion tube; 34, injection tube; 35, piston Plate; 36, extension rod; 37, abutment wheel; 38, sliding block; 39, reciprocating screw; 310, first motor; 311, hydraulic telescopic rod; 312, triangular abutment plate; 4, stirring assembly; 41, rotating rod; 42, second motor; 43, stirring fan blade; 5, detection assembly; 51, rotating ring; 52, transmission ring; 53, gear ring; 54, transmission rod; 55, gear; 56, control block; 57, control chamber; 58, slide groove; 59, piston block; 510, second spring; 511, hydraulic hose. DETAILED DESCRIPTION

[0019] The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0020] Example: Refer to Figures 1 to 7 , a silicone rubber injection molding machine, comprising: A processing table 1 is provided, and a lower mold 11 is fixedly connected to the top of the processing table 1. An upper mold 12 is provided above the lower mold 11. A cylinder 13 is provided above the processing table 1 to drive the upper mold 12 to slide in a vertical direction.

[0021] The guide mechanism 2 includes two guide rods 21 fixedly connected to the upper end of the processing table 1, each guide rod 21 is sleeved with a sliding sleeve 22, and the upper end of the upper mold 12 is fixedly connected with a supporting plate 23. Before injection, the upper mold 12 is driven downward by the cylinder 13 to make the upper mold 12 fit with the lower mold 11. During this process, the sliding sleeve 22 on the supporting plate 23 will move along the guide rod 21 to guide the upper mold 12 at the lower end of the supporting plate 23 to prevent the mold from deviating during the injection process, ensure the centering and stability of the upper mold 12 and the lower mold 11, thereby ensuring the accuracy and consistency of the product.

[0022] The two sleeves 22 are both rotatably connected to the bearing plate 23, and a through hole 24 is provided on the side wall of each sleeve 22. Two lubrication boxes 25 are fixedly connected to the upper end of the bearing plate 23, and a lubrication channel 26 connected to the interior of the two lubrication boxes 25 is provided in the bearing plate 23. The bottom end of each sleeve 22 is fixedly connected to an L-shaped rod 27, and the bottom of each L-shaped rod 27 is rotatably connected to a guide wheel 28. Two spiral guide rails 29 that cooperate with the guide wheels 28 are fixedly connected to the processing table 1, and each spiral guide rail 29 is divided into a spiral section 210 and a straight section 211.

[0023] Among them, the lower end of the supporting plate 23 is fixedly connected with a stop block 212, and a first spring 213 is provided between the sliding sleeve 22 and the stop block 212. The first spring 213 can rotate the sliding sleeve 22 to return to the initial position when the guide wheel 28 falls off the straight section 211, so that the through hole 24 and the lubrication channel 26 are misaligned, thereby avoiding continuous lubrication of the lubricating oil and causing unnecessary waste.

[0024] When the guide wheel 28 moves from the spiral section 210 to the straight section 211 , the through hole 24 on the sliding sleeve 22 rotates to correspond to the lubrication channel 26 .

[0025] In view of the problem that the guide mechanism 2 in the prior art cannot be self-lubricated during use, after long-term use, the friction in the guide mechanism 2 will cause the guide column or guide sleeve to wear, causing the mold to easily deviate during the injection molding process, thereby reducing the accuracy and consistency of the product, the present invention sets a guide mechanism 2, and when the upper mold 12 moves down to fit with the lower mold 11, the guide wheel 28 first moves along the spiral section 210 of the spiral guide track 29, so that the sliding sleeve 22 rotates relative to the bearing plate 23 until the through hole 24 on the sliding sleeve 22 corresponds to the lubrication channel 26, at which time the guide The wheel 28 moves along the straight section 211 of the spiral guide track 29, and the lubricating oil in the lubrication box 25 flows into the space between the sliding sleeve 22 and the guide rod 21 through the lubrication channel 26 and the through hole 24, so as to lubricate the space between the sliding sleeve 22 and the guide rod 21. The guide mechanism 2 can be automatically lubricated during each operation, thereby reducing the operating resistance of the sliding sleeve 22 and the guide rod, and reducing the heat generated by friction, thereby preventing the sliding sleeve and the guide rod from being worn, ensuring the centering and stability of the upper mold 12 and the lower mold 11 during the injection process, and improving the product quality. At the same time, there is no need for manual lubrication by the staff, and the operation is convenient; In addition, after the film is closed, the guide wheel 28 is detached from the straight section 211, and the sleeve 22 is reset under the elastic force of the first spring 213, so that the through hole 24 and the lubrication channel 26 are misaligned, and lubrication is no longer performed. The delivery of the lubricating oil is automatically stopped after lubrication to avoid waste of the lubricating oil. After the processing is completed, it is only necessary to move the guide wheel 28 during the upward movement of the guide wheel 28 to avoid motion interference between the guide wheel 28 and the spiral guide track 29.

[0026] The injection mechanism 3 is also included. The injection mechanism 3 includes an injection cylinder 31 fixedly connected to the upper end of the carrier plate 23. The upper end of the processing table 1 is fixedly connected to a liquid storage tank 32. The upper end of the liquid storage tank 32 is connected to an infusion tube 33. The other end of the infusion tube 33 is connected to the injection cylinder 31. The side wall of the injection cylinder 31 is connected to an injection tube 34. The other end of the injection tube 34 is connected to the inside of the upper mold 12. Both the infusion tube 33 and the injection tube 34 are provided with a one-way valve. The injection cylinder 31 is sealed and slidably connected to a piston plate 35. The piston plate 35 is An extension rod 36 is fixedly connected, and the part of the extension rod 36 extending outside the injection barrel 31 is rotatably connected to the abutment wheel 37. The upper end of the supporting plate 23 is slidably connected to the sliding block 38. A reciprocating screw rod 39 is rotatably connected above the supporting plate 23. A first motor 310 for driving the reciprocating screw rod 39 is provided above the supporting plate 23. A hydraulic telescopic rod 311 is fixedly connected to the sliding block 38, and the telescopic end of the hydraulic telescopic rod 311 is fixedly connected to a triangular abutment plate 312, which contacts and rolls with the abutment wheel 37.

[0027] It is worth mentioning that the present invention, through the injection mechanism 3 set up, drives the reciprocating screw 39 to rotate through the first motor 310, so as to realize the reciprocating translation of the sliding block 38, and further through the hydraulic telescopic rod 311 and the triangular abutment plate 312, the abutment wheel 37 is reciprocated to lift up, so that the piston plate 35 is reciprocated upward displacement, and reciprocated downward displacement under the action of gravity to return to the initial position, and the suction and injection of the raw material are realized by the reciprocating movement of the piston plate 35 in the injection barrel 31. In this process, the height of the triangular abutment plate 312 can be adjusted by the hydraulic telescopic rod 311. Through the different heights of the triangular abutment plate 312, the distance by which the inclined surface pushes the guide wheel 28 upward is different, so as to realize the adjustment of the raw material suction rate, and then adjust the injection speed. The injection speed can be adjusted according to the actual situation to ensure that the detection component 5 can synchronously adjust the injection speed after detecting the fluidity of the raw material.

[0028] It also includes a stirring assembly 4 arranged inside the liquid storage tank 32, the stirring assembly 4 includes a rotating rod 41 rotatably connected to the inside of the liquid storage tank 32, the lower end of the processing table 1 is fixedly connected to a second motor 42 for driving the rotating rod 41, and a plurality of stirring blades 43 are fixedly connected to the rotating rod 41. A detection assembly 5 is provided between the liquid storage tank 32 and the hydraulic telescopic rod 311, and the detection assembly 5 is used to detect the fluidity of the silicone rubber and adjust the injection mechanism 3 according to the fluidity of the silicone rubber.

[0029] It should be noted that, by setting up the stirring assembly 4, during injection, the second motor 42 can drive the rotating rod 41 to rotate, and then the silicone rubber raw material in the liquid storage tank 32 can be stirred by the stirring blades 43, which helps to evenly mix the various components of the silicone rubber (such as vulcanizer, filler, additives, etc.) to ensure consistent performance of the finished product.

[0030] The detection assembly 5 includes a rotating ring 51 rotatably connected to the inner wall of the liquid storage tank 32, the upper end of the rotating ring 51 is fixedly connected to a transmission ring 52, the transmission ring 52 is sealingly rotatably connected to the upper wall of the liquid storage tank 32, the top of the transmission ring 52 is fixedly connected to a gear ring 53, the upper end of the processing table 1 is rotatably connected to a transmission rod 54, the transmission rod 54 is fixedly connected to a gear 55 meshing with the gear ring 53, the top of the transmission rod 54 is fixedly connected to a control block 56, a control cavity 57 is defined in the control block 56, a plurality of slide grooves 58 are defined on the peripheral side walls of the control cavity 57, each slide groove 58 is slidably connected to a piston block 59, a second spring 510 is provided between each piston block 59 and the inner wall of the slide groove 58, the upper end of the control block 56 is sealingly rotatably connected to a hydraulic hose 511, the hydraulic hose 511 communicates the control cavity 57 and the hydraulic telescopic rod 311.

[0031] When the plurality of stirring blades 43 stir the silicone rubber, the greater the fluidity of the silicone rubber, the smaller its viscosity, and thus the shear stress of the silicone rubber raw material drives the rotation speed of the rotating ring 51 to decrease.

[0032] In view of the problem that the injection speed cannot be adjusted according to the fluidity of the raw materials in the prior art, when the fluidity of the raw materials is good, a slower injection speed will lead to insufficient pressure inside the mold, affecting the density and strength of the final product and reducing the injection efficiency. When the fluidity of the raw materials is poor, a faster injection speed will lead to uneven flow of the silicone rubber raw materials in the mold, resulting in local unfilled defects, making it impossible to ensure the processing accuracy and processing efficiency, the present invention sets a detection component 5, while the stirring blades 43 stir the silicone rubber raw materials, the shear stress of the silicone rubber raw materials will drive the rotating ring 51 to rotate, the specific rotation of the rotating ring 51 and the telescopic condition of the hydraulic telescopic rod 311 are as follows: When the fluidity of the silicone rubber raw material is strong, its viscosity is low, and the shear stress generated is low, so that the rotation speed of the rotating ring 51 is slow. Further, under the action of the gear ring 53 and the gear 55, the rotation speed of the transmission rod 54 is slow, so that the piston block 59 inside the control block 56 at the top of the transmission rod 54 slides in the slide groove 58 for a short distance under the action of centrifugal force, thereby making the hydraulic oil in the hydraulic telescopic rod 311 more, so that the hydraulic telescopic rod 311 maintains the triangular abutment plate 312 at a higher position. When the fluidity of the silicone rubber raw material is strong, the injection speed is correspondingly increased to avoid insufficient pressure inside the mold, which affects the density and strength of the final product and improves production efficiency at the same time. When the fluidity of the silicone rubber raw material is weak, the shear stress generated by the silicone rubber raw material is large, the rotation speed of the rotating ring 51 is fast, and the piston block 59 slides a large distance in the slide groove 58 under the action of centrifugal force, so that the space between the control chamber 57 and each piston block 59 is increased, and the hydraulic oil in the hydraulic telescopic rod 311 is pumped into the control chamber 57, so that the hydraulic telescopic rod 311 maintains the triangular abutment plate 312 at a lower position, and then when the fluidity is weak, a slower injection speed is applied to avoid uneven flow of silicone rubber in the mold due to excessive injection speed, resulting in local unfilled or defects. The injection speed can be automatically adjusted according to the fluidity of the silicone rubber raw material, thereby improving the processing accuracy and processing efficiency during silicone rubber injection molding.

[0033] A molding method applied to the above silicone rubber injection molding machine comprises the following steps: S1, film closing process: before injection, the upper mold 12 is driven downward by the cylinder 13 to make the upper mold 12 fit with the lower mold 11. During this process, the upper mold 12 is guided by the sliding sleeve 22 and the guide rod 21; S2. Self-lubricating treatment: During the film closing process, when the upper mold 12 moves down to fit with the lower mold 11, the guide wheel 28 first moves along the spiral section 210 of the spiral guide track 29, so that the sleeve 22 rotates relative to the carrier plate 23, until the through hole 24 on the sleeve 22 corresponds to the lubrication channel 26. At this time, the guide wheel 28 moves along the straight section 211 of the spiral guide track 29, and the lubricating oil in the lubrication box 25 flows into the space between the sleeve 22 and the guide rod 21 through the lubrication channel 26 and the through hole 24, so as to lubricate the space between the sleeve 22 and the guide rod 21, and automatically lubricate the guide mechanism 2 during each operation; S3, injection processing: during injection, the reciprocating screw 39 is driven to rotate by the first motor 310, so that the sliding block 38 can be reciprocated and translated, and the abutment wheel 37 is reciprocated and lifted by the hydraulic telescopic rod 311 and the triangular abutment plate 312, so that the piston plate 35 is reciprocated and displaced upward, and reciprocated and displaced downward to return to the initial position under the action of gravity. The reciprocating movement of the piston plate 35 in the injection barrel 31 makes the silicone rubber raw material in the liquid storage tank 32 continuously enter the injection barrel 31 through the infusion tube 33, and is continuously discharged into the cavity of the upper mold 12 and the lower mold 11 through the injection tube 34. The height of the triangular abutment plate 312 is controlled by the hydraulic telescopic rod 311 to adjust the injection speed; S4. Fluidity detection: During injection, the rotating rod 41 is driven to rotate by the second motor 42, and then the silicone rubber raw material in the liquid storage tank 32 is stirred by the stirring blades 43. At the same time, the shear stress of the silicone rubber raw material will drive the rotating ring 51 to rotate. When the fluidity of the silicone rubber raw material is strong, the hydraulic telescopic rod 311 maintains the triangular abutment plate 312 at a higher position, and the injection speed is correspondingly increased when the fluidity of the silicone rubber raw material is strong. When the fluidity of the silicone rubber raw material is weak, the hydraulic oil in the hydraulic telescopic rod 311 is less, and the triangular abutment plate 312 is maintained at a lower position, and a slower injection speed is applied when the fluidity is weak.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A silicone rubber injection molding machine, characterized in that: include: A processing table (1), wherein a lower mold (11) is fixedly connected to the top of the processing table (1), an upper mold (12) is provided above the lower mold (11), and a cylinder (13) is provided above the processing table (1) for driving the upper mold (12) to slide in a vertical direction; A guide mechanism (2), the guide mechanism (2) comprising two guide rods (21) fixedly connected to the upper end of the processing table (1), each of the guide rods (21) being sleeved with a sliding sleeve (22), the upper end of the upper mold (12) being fixedly connected to a bearing plate (23), the two sliding sleeves (22) being rotatably connected to the bearing plate (23), a through hole (24) being formed on the side wall of each sliding sleeve (22), and two lubrication boxes (25) being fixedly connected to the upper end of the bearing plate (23), A lubrication channel (26) communicating with the interior of the two lubrication boxes (25) is provided in the bearing plate (23); the bottom end of each of the sliding sleeves (22) is fixedly connected to an L-shaped rod (27); the bottom of each of the L-shaped rods (27) is rotatably connected to a guide wheel (28); two spiral guide rails (29) cooperating with the guide wheels (28) are fixedly connected to the processing table (1); each of the spiral guide rails (29) is divided into a spiral section (210) and a straight section (211).

2. The silicone rubber injection molding machine according to claim 1, characterized in that: A stop block (212) is fixedly connected to the lower end of the bearing plate (23), and a first spring (213) is provided between the sliding sleeve (22) and the stop block (212).

3. The silicone rubber injection molding machine according to claim 2, characterized in that: When the guide wheel (28) moves from the spiral section (210) to the straight section (211), the through hole (24) on the sliding sleeve (22) rotates to correspond to the lubrication channel (26).

4. The silicone rubber injection molding machine according to claim 3, characterized in that: The processing platform (1) further comprises an injection mechanism (3), wherein the injection mechanism (3) comprises an injection cylinder (31) fixedly connected to the upper end of the carrier plate (23); a liquid storage tank (32) fixedly connected to the upper end of the processing platform (1); an infusion tube (33) is connected to the upper end of the liquid storage tank (32); the other end of the infusion tube (33) is connected to the injection cylinder (31); an injection tube (34) is connected to the side wall of the injection cylinder (31); the other end of the injection tube (34) is connected to the interior of the upper mold (12); a one-way valve is provided in each of the infusion tube (33) and the injection tube (34); a piston plate (35) is sealingly and slidably connected to the inside of the injection cylinder (31); the ... An extension rod (36) is fixedly connected to the top of the injection cylinder (35), and the portion of the extension rod (36) extending outside the injection cylinder (31) is rotatably connected to an abutment wheel (37). The upper end of the support plate (23) is slidably connected to a sliding block (38), and a reciprocating screw rod (39) is rotatably connected above the support plate (23). A first motor (310) for driving the reciprocating screw rod (39) is provided above the support plate (23). A hydraulic telescopic rod (311) is fixedly connected to the sliding block (38), and the telescopic end of the hydraulic telescopic rod (311) is fixedly connected to a triangular abutment plate (312), and the triangular abutment plate (312) contacts and rolls with the abutment wheel (37).

5. The silicone rubber injection molding machine according to claim 4, characterized in that: The invention also comprises a stirring assembly (4) arranged inside the liquid storage tank (32), the stirring assembly (4) comprising a rotating rod (41) rotatably connected to the inside of the liquid storage tank (32), a second motor (42) for driving the rotating rod (41) being fixedly connected to the lower end of the processing table (1), a plurality of stirring blades (43) being fixedly connected to the rotating rod (41), a detection assembly (5) being provided between the liquid storage tank (32) and the hydraulic telescopic rod (311), the detection assembly (5) being used to detect the fluidity of the silicone rubber and to adjust the injection mechanism (3) according to the fluidity of the silicone rubber.

6. The silicone rubber injection molding machine according to claim 5, characterized in that: The detection assembly (5) comprises a rotating ring (51) rotatably connected to the inner wall of the liquid storage tank (32); the upper end of the rotating ring (51) is fixedly connected to a transmission ring (52); the transmission ring (52) is sealingly rotatably connected to the upper wall of the liquid storage tank (32); the top end of the transmission ring (52) is fixedly connected to a gear ring (53); the upper end of the processing table (1) is rotatably connected to a transmission rod (54); the transmission rod (54) is fixedly connected to a gear (55) meshing with the gear ring (53); the transmission rod (54) A control block (56) is fixedly connected to the top of the control block (56), a control chamber (57) is defined in the control block (56), a plurality of slide grooves (58) are defined on the peripheral side walls of the control chamber (57), a piston block (59) is slidably connected in each of the slide grooves (58), a second spring (510) is provided between each of the piston blocks (59) and the inner wall of the slide groove (58), a hydraulic hose (511) is sealingly rotatably connected to the upper end of the control block (56), and the hydraulic hose (511) communicates with the control chamber (57) and the hydraulic telescopic rod (311).

7. The silicone rubber injection molding machine according to claim 6, characterized in that: When the plurality of stirring blades (43) stir the silicone rubber, the greater the fluidity of the silicone rubber, the smaller the rotation speed of the rotating ring (51).

8. The molding method of the silicone rubber injection molding machine according to claim 7, characterized in that: The following steps are involved: S1, mold closing process: before injection, the upper mold (12) is driven downward by the cylinder (13) so that the upper mold (12) and the lower mold (11) are fitted together. During this process, the upper mold (12) is guided by the sliding sleeve (22) and the guide rod (21); S2, self-lubricating treatment: during the film closing process, when the upper mold (12) moves down to fit with the lower mold (11), the guide wheel (28) first moves along the spiral section (210) of the spiral guide track (29), thereby causing the sliding sleeve (22) to rotate relative to the bearing plate (23) until the through hole (24) on the sliding sleeve (22) corresponds to the lubricating channel (26). At this time, the guide wheel (28) moves along the straight section (211) of the spiral guide track (29), and the lubricating oil in the lubrication box (25) flows into the space between the sliding sleeve (22) and the guide rod (21) through the lubricating channel (26) and the through hole (24), thereby lubricating the space between the sliding sleeve (22) and the guide rod (21), and automatically lubricating the guide mechanism (2) during each operation; S3, injection processing: during injection, the reciprocating screw rod (39) is driven to rotate by the first motor (310), so as to realize the reciprocating translation of the sliding block (38), and further, the abutment wheel (37) is reciprocatingly lifted by the hydraulic telescopic rod (311) and the triangular abutment plate (312), so that the piston plate (35) is reciprocatingly displaced upward, and reciprocatingly displaced downward to return to the initial position under the action of gravity. The reciprocating movement of the piston plate (35) in the injection barrel (31) causes the silicone rubber raw material in the liquid storage tank (32) to continuously enter the injection barrel (31) through the infusion tube (33), and continuously be discharged into the cavities of the upper mold (12) and the lower mold (11) through the injection tube (34). The height of the triangular abutment plate (312) is controlled by the hydraulic telescopic rod (311) to adjust the injection speed; S4. Fluidity detection: During injection, the second motor (42) drives the rotating rod (41) to rotate, and then the silicone rubber raw material in the liquid storage tank (32) is stirred by the stirring blades (43). At the same time, the shear stress of the silicone rubber raw material will drive the rotating ring (51) to rotate. When the fluidity of the silicone rubber raw material is strong, the hydraulic telescopic rod (311) maintains the triangular abutment plate (312) at a higher position. When the fluidity of the silicone rubber raw material is strong, the injection speed is correspondingly increased. When the fluidity of the silicone rubber raw material is weak, the hydraulic oil in the hydraulic telescopic rod (311) is less, and the triangular abutment plate (312) is maintained at a lower position. When the fluidity is weak, a slower injection speed is applied.

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