Automatic compression molding device and compression molding method for bottle cap

Abstract

The invention discloses a bottle cap automatic compression molding device and a compression molding method, and particularly relates to the technical field of bottle cap molding.The bottle cap automatic compression molding device comprises a supporting frame, an upper mold frame and a lower mold frame which rotate synchronously are rotationally connected to the supporting frame, a compression molding air cylinder is fixedly connected to the lower mold frame, and a piston rod of the compression molding air cylinder is fixedly connected with an outer mold sleeve; an inner mold column vertically aligned with the outer mold is rotationally connected to the upper mold frame, a threaded groove is formed in the inner mold column, a cooling arc plate is connected to the supporting frame, a cooling air pipe is connected to the bottom of the cooling arc plate, and a cooling toothed plate matched with a transmission gear on the top of the inner mold column is arranged on the side face of the cooling arc plate. The cooling arc plate is arranged on the side face of the supporting frame, the inner mold column with the formed bottle cap is driven to rotate, meanwhile, the air flow speed in the cooling arc plate is increased, the bottle cap is rapidly and evenly cooled, it is avoided that the machining efficiency is affected due to slow cooling of the bottle cap, and shrinkage deformation caused by uneven cooling speed of the bottle cap can be effectively prevented; the discharged heat is discharged through the cooling air pipe, and the influence on the workshop temperature is reduced.

Description

Technical Field

[0001] The invention relates to the field of bottle cap molding, in particular to an automatic bottle cap compression molding device and a compression molding method. Background Art

[0002] Plastic bottle cap molding is divided into two methods: injection molding and compression molding. Injection molding is to heat the raw materials to melt, squeeze them into a closed mold under pressure, and separate the mold after cooling. Compression is to heat the raw materials to soften, feed the softened material into the mold, close the mold to extrude the raw materials into shape, and then separate the mold to take out the molded bottle cap. The heating temperature and pressure required for compression molding are smaller than those for injection molding, so compression molding is more energy-efficient than injection molding.

[0003] The patent document with announcement number CN114425831A discloses a molding device for the production of plastic bottle caps, which relates to the technical field of compression molding equipment, including a support box and a raw material conveying component. A molding component and a blanking component are installed in the support box. The molding component includes a support unit, a drive unit, a demolding unit, a cooling unit, a lifting box, a lower mold plate, and an upper mold. The support unit is installed in the support box, and the cooling unit and the drive unit are both installed on the support unit. The lifting box is slidably installed inside the support box, and the lower mold plate is slidably installed in the support box; the demolding unit is installed in the lifting box, and the blanking component includes a blanking plate and a stretching unit. The stretching unit is installed in the support box, and the blanking plate is installed on the stretching unit. The raw material can be quickly compression molded by the molding component, and multiple bottle caps can be molded at the same time. The molded bottle caps can be demolded stably and efficiently by the demolding component.

[0004] In compression molding, the molded bottle cap is threadedly connected to the inner mold. Before the bottle cap is rotated to disengage, if the bottle cap is not fully cooled and solidified, contact with the bottle cap may cause the bottle cap to deform. Summary of the invention

[0005] The object of the present invention is to provide a bottle cap automatic compression molding device and compression molding method to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] The invention discloses an automatic compression molding device for bottle caps, comprising a support frame, an upper mold frame and a lower mold frame which are rotatably connected to the support frame and rotate synchronously, a compression molding cylinder which is fixedly connected to the lower mold frame, a piston rod of which is fixedly connected to an outer mold sleeve, an inner mold column which is rotatably connected to the upper mold frame and is vertically aligned with the outer mold, a threaded groove is arranged on the inner mold column, a cooling arc plate is connected to the support frame, a cooling air pipe is connected to the bottom of the cooling arc plate, and a cooling tooth plate which cooperates with a transmission gear at the top of the inner mold column is arranged on the side of the cooling arc plate.

[0008] Preferably, the cross-section of the cooling arc plate is U-shaped, a through hole is arranged on the side of the cooling arc plate, and the cooling tooth plate is arranged on the outer side of the top of the cooling arc plate.

[0009] Preferably, the transmission gear is rotatably connected to the upper mold frame, the bottom end of the transmission gear is fixedly connected to the transmission gear ring, the transmission gear ring is meshed with the speed gear, the speed gear is rotatably connected to the upper mold frame, and the speed gear is meshed with the driven gear coaxially fixedly connected to the inner mold column.

[0010] Preferably, a demoulding structure is provided on the side of the support frame, and the demoulding structure includes a demoulding tooth plate, the demoulding tooth plate is meshed with a transmission gear, and a demoulding wheel is rotatably connected below the demoulding tooth plate, and the demoulding wheel is tangent to the inner mold column.

[0011] Preferably, the demoulding wheel comprises a wheel axle, the wheel axle is fixedly connected to a ring plate via an elastic plate, and the outer side of the ring plate is fixedly connected to a demoulding ring made of rubber.

[0012] Preferably, the wheel axle is rotatably connected in the axle seat, the axle seat is connected to the fixing frame through an adjusting screw, the demoulding tooth plate is fixed on the fixing frame, and the fixing frame is fixed to the side of the supporting frame.

[0013] Preferably, a slitting structure is provided on the side of the support frame, and the slitting structure includes a knife seat fixed on the side of the support frame, the knife seat is arc-shaped, and a knife groove is provided on the concave arc side of the knife seat, and spaced blades are inserted in the knife groove.

[0014] Preferably, the blade comprises an arc-shaped piece extending out of the blade groove, the outer side of the arc-shaped piece is fixedly connected to a sliding piece, the sliding piece slides in the sliding groove, the inner end of the sliding piece is connected to one end of a spring, and the other end of the spring abuts against the inner wall of the blade seat.

[0015] Preferably, the top of the inner mold column is fixedly connected to a slitting gear, and the slitting gear is meshed with a slitting arc plate fixed on the knife seat.

[0016] A compression molding method of an automatic compression molding device for bottle caps. During the compression molding of the bottle caps, heated raw materials are added into an outer mold sleeve in the compression molding device through automatic feeding equipment, a lower mold base and an upper mold base are fixedly connected, and an upper mold frame and a lower mold frame are rotatably connected to a support frame, and the outer mold sleeve and an inner mold column are driven to rotate during the rotation. During the process, a compression molding cylinder drives the outer mold sleeve to move up and close with the inner mold column, so that the raw materials are molded under the action of pressure, and then the outer mold sleeve is separated under the drive of the compression molding cylinder, and the molded bottle cap rotates with the inner mold column connected to the upper mold frame, and then the molded bottle cap passes through a cooling arc plate in a cooling structure, and the cooling arc plate is connected to an exhaust pump through an air pipe to achieve cooling.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. A cooling arc plate is set on the side of the support frame to drive the inner mold column with the formed bottle cap to rotate, and at the same time accelerate the air flow rate inside the cooling arc plate, so that the bottle cap can be cooled quickly and evenly, avoiding the slow cooling of the bottle cap and affecting the processing efficiency. It can also effectively prevent the bottle cap from shrinking and deforming due to uneven cooling rate. The exhaust heat is discharged through the cooling air pipe to reduce the impact on the workshop temperature;

[0019] 2. In the demoulding structure, the demoulding wheel adopts an elastic plate to connect the ring plate, and a rubber demoulding ring is fixedly connected to the outside of the ring plate to ensure sufficient friction to separate the bottle cap from the inner mold column while also avoiding excessive pressure that causes the bottle cap to be compressed and deformed;

[0020] 3. A slitting gear fixedly connected to the inner mold column cooperates with a slitting tooth plate fixed on the knife seat, so that when the inner mold column rolls relative to the knife seat, the formed bottle cap on the inner mold column and the blade are prevented from lateral movement, resulting in slitting fracture;

[0021] 4. The pressure control cylinder is cylindrical and the outer side is sealed and rotatably connected to the sealing sleeve, which is connected to the compression cylinder through the sealing sleeve. When the compression cylinder connected to the lower mold frame rotates to the corresponding end, it can be pressurized to extend the piston rod, and when it is subjected to negative pressure, the piston rod can be contracted to complete the separation of the compression molding and the outer mold sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the upper mold frame, the lower mold frame and the connecting cylinder of the present invention;

[0024] Figure 3 It is a structural schematic diagram of the cooling structure of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the demoulding structure of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the demoulding wheel of the present invention;

[0027] Figure 6 is a cross-sectional view of a connecting column of the present invention;

[0028] Figure 7 It is a cross-sectional view of the compression molding cylinder of the present invention;

[0029] Figure 8 It is a structural schematic diagram of the slit structure of the present invention;

[0030] Fig. 9 It is a schematic diagram of the structure of the blade of the present invention;

[0031] In the figure: 1, support frame; 2, cooling structure; 21, cooling arc plate; 22, cooling tooth plate; 3, pressure control cylinder; 4, lower mold frame; 41, connecting cylinder; 5, compression cylinder; 51, outer mold sleeve; 52, pressure pipe; 53, pressure control cylinder; 531, partition; 54, sealing sleeve; 6, demoulding structure; 61, demoulding tooth plate; 62, demoulding wheel; 621, wheel shaft; 622, elastic sheet; 623, ring plate; 624, demoulding ring; 63, demoulding motor; 64, fixed frame; 7, upper mold frame; 8, slitting structure; 81, knife seat; 82, slitting tooth plate; 83, blade; 831, arc piece; 832, slide; 833, spring; 9, inner mold column; 91, thread groove; 92, slitting gear; 93, driven gear; 94, speed change gear; 95, transmission gear ring; 96, transmission gear; 97, connecting column. DETAILED DESCRIPTION

[0032] Example 1

[0033] like Figure 1-9 As shown, an automatic compression molding device for bottle caps comprises a support frame 1, an upper mold frame 7 and a lower mold frame 4 which rotate synchronously are rotatably connected to the support frame 1, a compression molding cylinder 5 is fixedly connected to the lower mold frame 4, a piston rod of the compression molding cylinder 5 is fixedly connected to an outer mold sleeve 51, an inner mold column 9 which is vertically aligned with the outer mold is rotatably connected to the upper mold frame 7, a thread groove 91 is arranged on the inner mold column 9, a cooling arc plate 21 is connected to the support frame 1, a cooling air pipe is connected to the bottom of the cooling arc plate 21, and a cooling air pipe which is aligned with the inner mold is arranged on the side of the cooling arc plate 21 The cooling tooth plate 22 cooperates with the transmission gear 96 at the top of the column 9; the cross-section of the cooling arc plate 21 is U-shaped, and a through hole is set on the side of the cooling arc plate 21, and the cooling tooth plate 22 is set on the outside of the top of the cooling arc plate 21; the transmission gear 96 is rotatably connected to the upper mold frame 7, and the bottom end of the transmission gear 96 is fixedly connected to the transmission gear ring 95, and the transmission gear ring 95 is meshed with the speed gear 94, and the speed gear 94 is rotatably connected to the upper mold frame 7, and the speed gear 94 is meshed with the driven gear 93 coaxially fixedly connected to the inner mold column 9.

[0034] During the compression molding of the bottle cap, the heated raw material is added into the outer mold sleeve 51 in the compression molding device through the automatic feeding device, the lower mold base and the upper mold base are fixedly connected, and the upper mold frame 7 and the lower mold frame 4 are rotatably connected to the support frame 1, and the outer mold sleeve 51 and the inner mold column 9 are driven to rotate during the rotation process. During the process, the compression molding cylinder 5 drives the outer mold sleeve 51 to move up and close with the inner mold column 9, so that the raw material is molded by pressure, and then the outer mold sleeve 51 is separated by the compression molding cylinder 5, and the molded bottle cap rotates with the inner mold column 9 connected to the upper mold frame 7, and then the molded bottle cap passes through the cooling structure 2 The cooling arc plate 21 is connected to the exhaust pump through the air pipe to achieve cooling; the inner mold column 9 is rotatably connected to the bottom end of the connecting column 97 fixed on the upper mold frame 7, and the connecting column 97 is rotatably connected to the transmission gear 96. When the transmission gear 96 is engaged with the cooling tooth plate 22, the transmission gear 96 rotates, and the transmission gear ring 95 fixedly connected to the transmission gear 96 rotates, and the speed gear 94 rotatably connected to the connecting column 97 rotates, thereby causing the driven gear 93 meshed with the speed gear 94 to rotate, driving the inner mold column 9 to rotate quickly, and cooperating with ventilation, so that the bottle cap is quickly and evenly cooled.

[0035] Example 2

[0036] like Figure 1-9 As shown, an automatic compression molding device for bottle caps comprises a support frame 1, an upper mold frame 7 and a lower mold frame 4 which rotate synchronously are rotatably connected to the support frame 1, a compression molding cylinder 5 is fixedly connected to the lower mold frame 4, a piston rod of the compression molding cylinder 5 is fixedly connected to an outer mold sleeve 51, an inner mold column 9 which is vertically aligned with the outer mold is rotatably connected to the upper mold frame 7, a thread groove 91 is arranged on the inner mold column 9, a cooling arc plate 21 is connected to the support frame 1, a cooling air pipe is connected to the bottom of the cooling arc plate 21, a cooling tooth plate 22 which cooperates with a transmission gear 96 at the top of the inner mold column 9 is arranged on the side of the support frame 1, and a cooling plate 22 which cooperates with a transmission gear 96 at the top of the inner mold column 9 is arranged on the side of the support frame 1 There is a slitting structure 8, which includes a knife seat 81 fixed on the side of the support frame 1. The knife seat 81 is arc-shaped, and a knife groove is set on the concave arc side of the knife seat 81, and a spaced blade 83 is inserted in the knife groove; the blade 83 includes an arc-shaped piece 831 extending out of the knife groove, and the outer side of the arc-shaped piece 831 is fixedly connected to a slide 832, and the slide 832 slides in the slide groove. The inner end of the slide 832 is connected to one end of a spring 833, and the other end of the spring 833 is against the inner wall of the knife seat 81; the top of the inner mold column 9 is fixedly connected to a slitting gear 92, and the slitting gear 92 is engaged with a slitting tooth plate 82 fixed on the knife seat 81.

[0037] After the inner mold column 9 carries the formed bottle cap through the cooling structure 2, the upper mold frame 7 continues to rotate and drives it to enter the slitting structure 8. First, the slitting gear 92 engages with the slitting tooth plate 82, and the inner mold column 9 coaxially fixedly connected to the slitting gear 92 rotates to make the inner mold column 9 roll relative to the knife seat 81. During the process, the inner mold column 9 and the blade 83 are prevented from sliding relative to each other to form a slit, so that a safety ring is formed on the top of the bottle cap; after the blade 83 in the knife seat 81 contacts the bottle cap, it is pressed by the spring 833, and the arc piece 831 slits the bottle cap. The blade 83 is slidably connected to the knife seat 81 to prevent the blade 83 from excessively contacting the inner mold column 9 and causing damage to the blade 83. Under the air pressure of the spring 833 and the air cavity in the knife seat 81, the blade 83 has enough force to form a slit on the side of the bottle cap.

[0038] Example 3

[0039] like Figure 1-9 As shown, an automatic compression molding device for bottle caps comprises a support frame 1, an upper mold frame 7 and a lower mold frame 4 which rotate synchronously are rotatably connected to the support frame 1, a compression molding cylinder 5 is fixedly connected to the lower mold frame 4, an outer mold sleeve 51 is fixedly connected to the piston rod of the compression molding cylinder 5, an inner mold column 9 which is vertically aligned with the outer mold is rotatably connected to the upper mold frame 7, a thread groove 91 is arranged on the inner mold column 9, a cooling arc plate 21 is connected to the support frame 1, a cooling air pipe is connected to the bottom of the cooling arc plate 21, a cooling tooth plate 22 which cooperates with the transmission gear 96 at the top of the inner mold column 9 is arranged on the side of the support frame 1, and a cooling tooth plate 22 which cooperates with the transmission gear 96 at the top of the inner mold column 9 is arranged on the side of the support frame 1. A demoulding structure 6 is provided, which includes a demoulding tooth plate 61, which is meshed with a transmission gear 96, and a demoulding wheel 62 is rotatably connected to the lower side of the demoulding tooth plate 61, and the demoulding wheel 62 is tangent to the inner mold column 9; the demoulding wheel 62 includes an axle 621, and the axle 621 is fixedly connected to a ring plate 623 through an elastic plate, and a demoulding ring 624 made of rubber is fixedly connected to the outer side of the ring plate 623; the axle 621 is rotatably connected to the shaft seat, and the shaft seat is connected to a fixing frame 64 through an adjusting screw, and the demoulding tooth plate 61 is fixed to the fixing frame 64, and the fixing frame 64 is fixed to the side of the support frame 1.

[0040] After the slitting is completed, the bottle cap enters the demoulding structure 6. During this process, the demoulding motor 63 fixed on the shaft seat rotates to drive the demoulding wheel 62 to rotate, and the transmission gear 96 engages with the demoulding tooth plate 61 to make the inner mold column 9 rotate quickly. When the bottle cap contacts the demoulding wheel 62, the bottle cap rotates relative to the inner mold column 9, and the bottle cap is screwed off from the threaded groove 91 on the inner mold column 9, and finally the demoulding is completed. The demoulding wheel 62 is configured as a wheel axle 621 connected to the ring plate 623 through an elastic sheet 622, and a rubber demoulding ring 624 is fixedly connected to the outside of the ring plate 623 to ensure that the friction force makes the bottle cap rotate and avoid excessive pressure on the bottle cap to deform the incompletely cured bottle cap. The wheel axle 621 is connected to the shaft seat and slidably connected to the fixed frame 64, and the pressure intensity can be adjusted.

[0041] Example 4

[0042] like Figure 1-9 As shown, an automatic compression molding device for bottle caps comprises a support frame 1, on which an upper mold frame 7 and a lower mold frame 4 which rotate synchronously are rotatably connected, and a compression molding cylinder 5 is fixedly connected to the lower mold frame 4, and a piston rod of the compression molding cylinder 5 is fixedly connected to an outer mold sleeve 51, and an inner mold column 9 which is vertically aligned with the outer mold is rotatably connected to the upper mold frame 7, and a threaded groove 91 is arranged on the inner mold column 9, and a cooling arc plate 21 is connected to the support frame 1, and a cooling air pipe is connected to the bottom of the cooling arc plate 21, and a cooling tooth plate 22 which cooperates with a transmission gear 96 at the top of the inner mold column 9 is arranged on the side of the cooling arc plate 21; the upper mold frame 7 and the lower mold frame 4 are fixedly connected by a connecting tube 41, and the bottom end of the lower mold frame 4 is connected to the output shaft of the driving motor, and a pressure control tube 53 is fixed in the connecting tube 41, and the pressure control tube 53 comprises a pressurizing chamber and a pressure releasing chamber, and the side of the pressure control tube 53 is sealed and rotatably connected to a sealing sleeve 54, and the compression molding cylinder 5 is connected to the inner side of the sealing sleeve 54 through a pressure pipe 52.

[0043] The pressure is increased or released by the pressure control cylinder 3. The pressure control cylinder 53 is arranged in the connecting cylinder 41. The pressure control cylinder 53 is divided into a pressure chamber and a pressure release chamber by a partition 531. The connecting cylinder 41 drives the pressure tube 52 to rotate during rotation. The sealing sleeve 54 connected to the pressure tube 52 is connected to the pressure chamber and the pressure release chamber in sequence during the rotation. That is, during the compression molding process, the compression molding cylinder 5 is connected to the pressure chamber, and after the compression molding is completed, they are all connected to the pressure release chamber, which is used to control the operation of multiple compression molding cylinders 5 separately.

Claims

1. A bottle cap automatic compression molding device, characterized in that: The invention comprises a support frame (1), an upper mold frame (7) and a lower mold frame (4) which are rotatably connected to the support frame (1) and which rotate synchronously, a compression molding cylinder (5) which is fixedly connected to the lower mold frame (4), a piston rod of the compression molding cylinder (5) which is fixedly connected to an outer mold sleeve (51), an inner mold column (9) which is rotatably connected to the upper mold frame (7) and which is vertically aligned with the outer mold, a thread groove (91) being arranged on the inner mold column (9), a cooling arc plate (21) being connected to the support frame (1), a cooling air pipe being connected to the bottom of the cooling arc plate (21), and a cooling tooth plate (22) which cooperates with a transmission gear (96) at the top of the inner mold column (9) being arranged on the side of the cooling arc plate (21).

2. The automatic compression molding device for bottle caps according to claim 1, characterized in that: The cross section of the cooling arc plate (21) is U-shaped, a through hole is arranged on the side of the cooling arc plate (21), and the cooling tooth plate (22) is arranged on the outer side of the top of the cooling arc plate (21).

3. The automatic compression molding device for bottle caps according to claim 2, characterized in that: The transmission gear (96) is rotatably connected to the upper mold frame (7), the bottom end of the transmission gear (96) is fixedly connected to the transmission gear ring (95), the transmission gear ring (95) is meshed with the speed change gear (94), the speed change gear (94) is rotatably connected to the upper mold frame (7), and the speed change gear (94) is meshed with the driven gear (93) coaxially fixedly connected to the inner mold column (9).

4. The automatic compression molding device for bottle caps according to claim 1, characterized in that: A demoulding structure (6) is arranged on the side of the support frame (1), and the demoulding structure (6) comprises a demoulding tooth plate (61), the demoulding tooth plate (61) is meshed with a transmission gear (96), and a demoulding wheel (62) is rotatably connected below the demoulding tooth plate (61), and the demoulding wheel (62) is tangent to the inner mold column (9).

5. The automatic compression molding device for bottle caps according to claim 4, characterized in that: The demoulding wheel (62) comprises a wheel axle (621), the wheel axle (621) is fixedly connected to a ring plate (623) via an elastic plate, and the outer side of the ring plate (623) is fixedly connected to a demoulding ring (624) made of rubber.

6. The automatic compression molding device for bottle caps according to claim 5, characterized in that: The wheel shaft (621) is rotatably connected in the shaft seat, the shaft seat is connected to the fixing frame (64) through an adjusting screw, the demoulding tooth plate (61) is fixed on the fixing frame (64), and the fixing frame (64) is fixed to the side of the support frame (1).

7. The automatic compression molding device for bottle caps according to claim 1, characterized in that: The support frame (1) is provided with a slitting structure (8) on the side thereof. The slitting structure (8) comprises a knife seat (81) fixed on the side of the support frame (1). The knife seat (81) is arc-shaped. A knife groove is provided on the concave arc side of the knife seat (81). Spaced blades (83) are inserted into the knife groove.

8. The automatic compression molding device for bottle caps according to claim 7, characterized in that: The blade (83) comprises an arc-shaped piece (831) extending out of a blade groove, the outer side of the arc-shaped piece (831) is fixedly connected to a sliding piece (832), the sliding piece (832) slides in the sliding groove, the inner end of the sliding piece (832) is connected to one end of a spring (833), and the other end of the spring (833) abuts against the inner wall of the blade seat (81).

9. The automatic compression molding device for bottle caps according to claim 8, characterized in that: The top of the inner mold column (9) is fixedly connected to a slitting gear (92), and the slitting gear (92) is meshed with a slitting tooth plate (82) fixed on the knife seat (81).

10. A compression molding method of a bottle cap automatic compression molding device according to any one of claims 1 to 9, characterized in that: During the compression molding of the bottle cap, the heated raw material is added into the outer mold sleeve (51) in the compression molding device through the automatic feeding device, the lower mold base and the upper mold base are fixedly connected, and the upper mold frame (7) and the lower mold frame (4) are rotatably connected to the support frame (1), and the outer mold sleeve (51) and the inner mold column (9) are driven to rotate during the rotation process. During the process, the compression molding cylinder (5) drives the outer mold sleeve (51) to move up and close with the inner mold column (9), so that the raw material is molded under the action of pressure, and then the outer mold sleeve (51) is separated under the drive of the compression molding cylinder (5), and the molded bottle cap rotates with the inner mold column (9) connected to the upper mold frame (7), and then the molded bottle cap passes through the cooling arc plate (21) in the cooling structure (2), and the cooling arc plate (21) is connected to the exhaust pump through the air pipe to achieve cooling.

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