Mold for encapsulating iron parts

Abstract

The utility model relates to a kind of mould for rubber-coated forming of iron piece, it includes: lower die assembly, the lower die assembly includes lower mould plate, blanking groove being opened in the top of the lower mould plate, lower cavity being opened in the top of the lower mould plate and coaxially arranged with the blanking groove;Upper die assembly, the upper die assembly includes the upper mould plate of being set in the top of the lower mould plate liftable, upper feeding groove being opened in the bottom of the upper mould plate and being matched with the blanking groove, upper cavity being opened in the bottom of the upper mould plate and coaxially arranged with the upper feeding groove;The utility model mould for rubber-coated forming of iron piece places iron piece in the lower mould plate of lower die assembly, after upper die assembly descends and closes mould, iron piece is covered between cavity, molten rubber is injected into mould, rubber is shaped in cavity to be covered in the outside of iron piece, without manually again each to iron piece on sleeve rubber wheel, improve the efficiency and accuracy of iron axle sleeve rubber wheel, and save the input of artificial, save cost.

Description

Technical Field

[0001] This utility model belongs to the field of mold technology, specifically relating to a mold for coating iron parts with rubber. Background Technology

[0002] Injection molds, also known as injection molding dies, are tools used to produce rubber products. They are tools that give rubber products a complete structure and precise dimensions. At a certain temperature, completely molten plastic material is injected into the mold cavity, and after cooling and solidification, the molded product is obtained. For products like rubber wheels, in order to be suitable for office automation, metal pillars are usually used to penetrate two or more rubber wheels. They are commonly used in machines such as printers, printing presses, fax machines, or envelope machines.

[0003] In the existing technology, operators need to manually put the injection-molded rubber wheels onto the iron shaft one by one, or rely on a jig to put the rubber wheels onto the iron shaft. The existing technology has the following drawbacks: the efficiency of manually putting the rubber wheels on is low, the accuracy of the rubber wheel placement cannot be guaranteed, and the operators need to work continuously for a long time, which requires a lot of manpower and wastes costs. Utility Model Content

[0004] This invention provides a mold for forming rubber coating on iron parts, which solves the problems of low efficiency and high cost of manual rubber coating wheels.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is: a mold for coating iron parts with rubber, comprising: The lower mold assembly includes a lower mold plate, a material discharge groove formed on the top of the lower mold plate, a lower cavity formed on the top of the lower mold plate and coaxially arranged with the material discharge groove, and a lower flow channel formed on the top of the lower mold plate and connected to the lower cavity. The upper mold assembly includes an upper mold plate that is vertically and flexibly disposed on top of the lower mold plate, a feeding groove that is opened at the bottom of the upper mold plate and cooperates with the feeding groove, an upper cavity that is opened at the bottom of the upper mold plate and coaxially disposed with the feeding groove, and an upper flow channel that is disposed at the bottom of the upper mold plate and communicates with the upper cavity, wherein the upper cavity cooperates with the lower cavity. An adjustment assembly, the adjustment assembly including baffles adjustablely disposed on both sides of the lower template and used to block iron parts; Ejection assembly, which is used to eject the coated iron part after it has been molded.

[0006] Optimally, the lower flow channel includes a lower main flow channel opened on the top of the lower template, lower cold sluice wells disposed at both ends of the lower main flow channel, a lower secondary flow channel opened on the top of the lower template and connecting the lower main flow channel and the lower cavity, and a lower guide section inclinedly disposed on the lower secondary flow channel near the lower cavity.

[0007] Optimally, the upper flow channel includes an upper main flow channel located at the bottom of the upper mold and cooperating with the lower main flow channel, upper cold material wells located at both ends of the upper main flow channel, an upper secondary flow channel located at the bottom of the upper mold and connecting the upper main flow channel and the upper cavity, and an upper guide section located at one end of the upper secondary flow channel near the upper cavity.

[0008] Optimally, the lower mold assembly further includes a carrier plate fixed to the top of the lower mold plate, a carrier groove formed on the top of the carrier plate for supporting the iron part, and a clearance portion formed on the top of the carrier groove.

[0009] Optimally, the adjustment assembly further includes an adjustment plate fixed to the side opposite to the baffle and an adjustment groove penetrating the adjustment plate.

[0010] Optimally, the ejection assembly includes an ejector hole that penetrates the lower template and communicates with the lower cavity, a top plate that is vertically and movably disposed at the bottom of the lower template, an ejector rod that is fixed to the top of the top plate and penetrates the ejector hole, and a spring sleeved on the ejector rod, wherein the spring is located between the top plate and the lower template.

[0011] Ideally, it also includes a guide hole penetrating the lower template, a guide post fixed to the bottom of the upper template and cooperating with the guide hole, and a guide portion inclinedly disposed at the bottom of the guide post.

[0012] Optimally, the upper mold assembly further includes a mounting plate embedded on the top of the upper mold plate, a feed rod fixed to the bottom of the mounting plate, a feed port opened on the top of the mounting plate, and a feed channel passing through the feed rod and connecting the feed port and the upper flow channel.

[0013] Ideally, the feed channel gradually increases in diameter from top to bottom.

[0014] Due to the application of the above technical solution, this utility model has the following advantages compared with the prior art: This utility model relates to a mold for molding iron parts with rubber coating. During injection molding, the iron part is placed in the lower mold plate of the lower mold assembly. After the upper mold assembly descends and closes, the iron part is wrapped between the cavities. Molten rubber is injected into the mold, and the rubber is formed in the cavity to cover the outer surface of the iron part. The rubber wheel is integrally formed on the iron part, eliminating the need for manual installation of rubber wheels on the iron parts one by one. This improves the efficiency and accuracy of rubber wheel installation on iron shafts, and saves labor input and costs. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a cross-sectional view of the present invention; Figure 3 This is a schematic diagram of the lower mold assembly of this utility model; Figure 4 This is a schematic diagram of the upper mold assembly of this utility model; Figure 5 This is a cross-sectional view of the upper mold assembly of this utility model; Figure 6 This is a cross-sectional view of the feeding assembly of this utility model; Figure 7 This utility model Figure 2 A schematic diagram of a partial structure; Explanation of reference numerals in the attached figures: 1. Vertical plate; 2. Support plate; 3. Adjusting plate; 4. Baffle; 5. Adjusting groove; 6. Lower template; 7. Guide hole; 8. Lower main channel; 9. Lower cold sluice well; 10. Lower secondary channel; 11. Lower cavity; 12. Lower guide section; 13. Feed trough; 14. Top hole; 15. Top rod; 16. Top plate; 17. Spring; 18. Carrier plate; 19. Carrier groove; 20. Clearance section; 21. Upper template; 22. Guide column; 23. Guide section; 24. Upper main channel; 25. Upper cold sluice well; 26. Upper secondary channel; 27. Upper cavity; 28. Upper guide section; 29. ​​Feed trough; 30. Mounting groove; 31. Through groove; 32. Mounting plate; 33. Feed rod; 34. Feed inlet; 35. Feed channel. Detailed Implementation

[0016] The present invention will be further described below with reference to the embodiments shown in the accompanying drawings.

[0017] like Figure 1 , 2 The diagram shows the structure of the mold for coating iron parts according to this utility model, including a lower mold assembly, an upper mold assembly, an adjustment assembly, and an ejection assembly. The iron part (usually an iron shaft) is placed between the lower mold assembly and the upper mold assembly. Molten rubber is injected into the interior of the upper mold assembly and the lower mold assembly, and after being formed and coated around the circumference of the iron part, the ejection assembly ejects the molded product.

[0018] like Figure 3 As shown, there are two upright plates 1, which are fixed to the injection molding machine platform by welding, and the two upright plates 1 are set vertically. The support plate 2 is fixed to the top of the two upright plates 1 by welding or screw fastening, and the lower template 6 is fixed to the top of the support plate 2 by screw fastening (that is, the lower template 6 is fixed to the side of the support plate 2 away from the upright plates 1).

[0019] There is one set (i.e., two) of material discharge grooves 13, which are spaced apart on the top of the lower mold plate 6. The cross-section of the material discharge groove 13 is semi-circular, which cooperates with the upper material groove 29 to form a circular material groove to match the iron part (the iron part is a metal column. The operator places the iron part in the material discharge groove 13 of the lower mold plate 6. At this time, the lower half of the iron part is stuck in the material discharge groove 13, and the upper half of the iron part is exposed on the lower mold plate 6. When the upper mold plate 21 descends to close with the lower mold plate 6, the iron part is covered between the material discharge groove 13 and the upper material groove 29).

[0020] The lower cavity 11 is located at the top of the lower template 6 and is coaxially arranged with the material feeding groove 13. The cross-section of the lower cavity 11 is semi-circular, and it mates with the upper cavity 27 to form a cavity. Molten adhesive is injected into the cavity, thereby covering the outer circumference of the iron part (e.g., Figure 3 As shown, each feeding groove 13 has two lower cavities 11 on both sides. The number of lower cavities 11 is determined according to the number of rubber rings that need to be covered on the iron part.

[0021] The lower runner is located at the top of the lower mold plate 6 and is connected to the lower cavity 11. It is used to inject molten plastic into the lower cavity 11 for molding. The lower runner includes a lower main runner 8, a lower cold slug well 9, a lower secondary runner 10, the lower cavity 11, and a lower guide section 12. The lower main runner 8 is located at the top of the lower mold plate 6 and between the two discharge channels 13. The lower main runner 8 is parallel to the discharge channels 13. The lower cold slug well 9 is located at both ends of the lower main runner 8. By setting the lower cold slug well 9, the low-temperature cold slug head of the molten material front during injection molding is stored to prevent it from entering the cavity and causing problems such as surface defects, increased internal stress, or mold filling obstacles in the plastic part (the cross-section of the lower main runner 8 and the lower secondary runner 10 are both semi-circular to match the upper main runner 24 and the upper secondary runner 26 above).

[0022] The lower secondary runner 10 is located at the top of the lower mold plate 6 and is symmetrically distributed on both sides of the lower main runner 8 to ensure consistent injection time in the cavities on both sides. The lower secondary runner 10 connects the lower main runner 8 and the lower cavity 11. Molten material flows from the lower main runner 8 to the lower secondary runner 10, and then flows into the cavities on both sides for molding (after the upper mold plate 21 and the lower mold plate 6 are closed, the lower cavity 11 and the upper cavity 27 form a cavity structure).

[0023] The lower guide section 12 is inclinedly disposed at one end of the lower auxiliary flow channel 10 near the lower cavity 11, such as Figure 7 As shown, by providing an inclined lower guide section 12 at the end of the lower sub-channel 10, it is beneficial for the molten material to fully fill the cavity, improve the fullness of the filling, and avoid the appearance of holes on the product surface due to incomplete filling.

[0024] Guide holes 7 penetrate the lower template 6 and are located at the four corners of the lower template 6, such as... Figure 4As shown, guide posts 22 that mate with guide holes 7 are fixed at the four corners of the bottom of the upper template 21 to improve the positional accuracy of the upper template 21 and the lower template 6 when they are closed. The guide part 23 is inclinedly set at the bottom of the guide post 22 to guide the inserted guide post 22 and facilitate the insertion of the guide post 22 into the guide hole 7.

[0025] There are two carrier plates 18, which are fixed to the top of the support plate 2 by welding and located on both sides of the lower mold plate 6. The carrier groove 19 is opened on the top of the carrier plate 18 and is used to support the two ends of the iron part (the operator places the iron part in the material groove 13 of the lower mold plate 6, at which time the two sides of the iron part rest on the carrier groove 19 of the carrier plate 18, and the iron part is supported by the carrier plates 18 on both sides, which improves the stability of the iron part during injection molding).

[0026] The clearance section 20 is inclinedly disposed on the top of the carrier plate 18. The clearance section 20 is inclined from bottom to top and outward. When the iron part is placed, the open design can avoid the iron part and facilitate the placement of the iron part.

[0027] Adjustment components are located on both sides of the lower template 6 to limit the position of the inserted iron parts and improve the accuracy of the overmolding position. The adjustment components include an adjustment plate 3, a baffle 4, and an adjustment groove 5. There are two adjustment plates 3, which are installed on the support plate 2 and located on both sides of the carrier plate 18. The adjustment groove 5 penetrates the adjustment plate 3 vertically and is rounded rectangular. The fixing hole penetrates the support plate 2 and mates with the adjustment groove 5. Fastening bolts pass through the adjustment groove 5 and the fixing hole in sequence, and nuts are used on the other side to fix the adjustment plate 3 to the support plate 2.

[0028] By adjusting the positions of the two adjusting plates 3, the rubber coating molding of iron parts of different lengths can be satisfied. The baffle 4 is fixed inside the adjusting plate 3. During actual installation, the iron part is placed in the material groove 13 of the lower template 6, and the two ends of the iron part abut against the inner sides of the two baffles 4 to ensure the consistency of the rubber coating position, thereby improving the qualification rate of the finished product.

[0029] like Figure 2 As shown, the top material hole 14 penetrates the lower template 6 and the support plate 2 vertically. The top plate 16 is located below the lower template 6 and moves vertically up and down under the drive of the lifting cylinder (the lifting cylinder is not shown in the figure. The lifting cylinder is a commercially available standard part. The cylinder body of the lifting cylinder is fixed to the injection molding machine table by screws. The piston rod of the lifting cylinder is set upward and connected to the lifting plate. The lifting plate is moved up and down by the lifting cylinder).

[0030] The push rod 15 is fixed to the top of the lifting plate and passes through the top material hole 14. The lifting plate is raised by the lifting cylinder, and the push rod 15 rises synchronously with the lifting plate, thus lifting the coated iron part. The operator then removes the coated iron part. During ejection, the spring 17 on the outside of the push rod 15 is compressed. When the lifting cylinder resets, the spring 17 assists the top plate 16 in resetting.

[0031] like Figure 4 , 5 As shown, the loading groove 29 consists of a set (i.e., two) spaced-apart openings at the bottom of the upper template 21. The cross-section of the loading groove 29 is semi-circular, which, together with the unloading groove 13, forms a circular material groove to match the iron part (the iron part is a metal column; the operator places the iron part into the unloading groove 13 of the lower template 6. At this time, the lower half of the iron part is stuck in the unloading groove 13, and the upper half of the iron part is exposed on the lower template 6. When the upper template 21 descends to close with the lower template 6, the iron part is covered between the unloading groove 13 and the loading groove 29).

[0032] The upper cavity 27 is located at the bottom of the upper mold plate 21 and is coaxially arranged with the feeding groove 29. The cross-section of the upper cavity 27 is semi-circular, and it mates with the lower cavity 11 to form a cavity. Molten adhesive is injected into the cavity, thereby covering the outer circumference of the iron part (e.g., Figure 4 As shown, each feeding trough 29 has two upper cavities 27 on both sides. The number of upper cavities 27 is determined according to the number of rubber rings to be covered on the iron parts, and the number of upper cavities 27 is equal to the number of lower cavities 11.

[0033] The upper runner is located at the bottom of the upper mold plate 21 and is connected to the upper cavity 27. It is used to inject molten rubber into the upper cavity 27 for molding. After the upper mold plate 21 and the lower mold plate 6 are closed, the upper runner and the lower runner match to form a runner. The molten material is injected into the cavity through the runner to form a mold.

[0034] The upper runner system includes an upper main runner 24, an upper cold slug well 25, an upper secondary runner 26, an upper cavity 27, and an upper guide section 28. The upper main runner 24 is located at the bottom of the upper mold plate 21 and between the two feed channels 29, and is parallel to the feed channels 29. The upper cold slug wells 25 are located at both ends of the upper main runner 24, and cooperate with the lower cold slug well 9 to store the low-temperature cold slug head of the molten material front during injection molding, preventing it from entering the cavity and causing problems such as surface defects, increased internal stress, or mold filling difficulties in the plastic part.

[0035] The upper secondary runner 26 is located at the bottom of the upper mold plate 21 and is symmetrically distributed on both sides of the upper main runner 24 to ensure consistent injection time in the cavities on both sides. The upper secondary runner 26 connects the upper main runner 24 and the upper cavity 27. The molten material flows from the upper main runner 24 to the upper secondary runner 26, and then flows into the cavities on both sides for molding (after the upper mold plate 21 and the lower mold plate 6 are closed, the lower cavity 11 and the upper cavity 27 form a cavity structure).

[0036] The upper guide section 28 is inclinedly disposed at one end of the upper auxiliary flow channel 26 near the upper cavity 27, such as Figure 7 As shown, by providing an inclined upper guide section 28 at the end of the upper sub-channel 26, it is beneficial for the molten material to fully fill the cavity, improve the fullness of the filling, and avoid the appearance of holes on the product surface due to incomplete filling.

[0037] like Figure 5 As shown, the mounting groove 30 is formed at the top of the upper template 21, and the through groove 31 is formed at the bottom of the mounting groove 30 and extends vertically through the upper template 21. Figure 6 As shown, the mounting plate 32 is fixed in the mounting groove 30 by screws, and the feed rod 33 is fixed to the bottom of the mounting plate 32 and passes through the through groove 31 to connect with the upper main channel 24.

[0038] The feed inlet 34 is located at the top of the mounting plate 32. The feed inlet 34 is bowl-shaped, and the molten rubber is injected into the feed inlet 34 to prevent it from spilling out. The feed channel 35 runs vertically through the feed rod 33 and connects the feed inlet 34 and the main channel. The feed channel 35 gradually widens in diameter from top to bottom, which facilitates the rapid flow of material to the main channel, shortens the molding time, and prevents the material from cooling and clogging the channel or affecting the molding effect during the process.

[0039] The frame is fixed to the support plate 2 by welding or screw fastening, and is erected above the lower mold assembly. The frame is equipped with a drive mechanism, which is connected to the upper template 21 and is used to drive the upper template 21 to move vertically up and down relative to the lower template 6, thereby realizing the closing and opening of the upper template 21 and the lower template 6 to complete the rubber coating molding of the iron parts.

[0040] The drive mechanism can be a commercially available conventional cylinder drive or screw drive. When a cylinder drive is used, the cylinder body of the lifting cylinder is fixedly mounted on the frame. The upper template 21 is connected to the piston rod end of the lifting cylinder via a connecting plate. When the lifting cylinder actuates, the extension and retraction motion of its piston rod is directly converted into the linear lifting motion of the upper template 21. When a screw drive is used, the servo motor on the frame is connected to the screw drive via a coupling, and the upper template 21 is fixedly connected to the screw nut. When the servo motor rotates, the rotational motion is converted into the linear lifting motion of the upper template 21 via the ball screw pair.

[0041] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.

Claims

1. A mold for coating iron parts with rubber, characterized in that, It includes: The lower mold assembly includes a lower template (6), a material groove (13) opened on the top of the lower template (6), a lower cavity (11) opened on the top of the lower template (6) and coaxially arranged with the material groove (13), and a lower flow channel arranged on the top of the lower template (6) and connected to the lower cavity (11). The upper mold assembly includes an upper mold plate (21) that is vertically and flexibly disposed on the top of the lower mold plate (6), a feeding groove (29) that is opened at the bottom of the upper mold plate (21) and cooperates with the feeding groove (13), an upper cavity (27) that is opened at the bottom of the upper mold plate (21) and coaxially disposed with the feeding groove (29), and an upper flow channel that is disposed at the bottom of the upper mold plate (21) and communicates with the upper cavity (27), wherein the upper cavity (27) cooperates with the lower cavity (11); Adjustment assembly, the adjustment assembly including baffles (4) adjustablely disposed on both sides of the lower template (6) and used to block iron parts; Ejection assembly, which is used to eject the coated iron part after it has been molded.

2. The mold for coating iron parts according to claim 1, characterized in that: The lower flow channel includes a lower main flow channel (8) opened on the top of the lower template (6), lower cold material wells (9) provided at both ends of the lower main flow channel (8), a lower secondary flow channel (10) opened on the top of the lower template (6) and connecting the lower main flow channel (8) and the lower cavity (11), and a lower guide section (12) inclinedly provided on the lower secondary flow channel (10) near the lower cavity (11).

3. The mold for coating iron parts according to claim 2, characterized in that: The upper flow channel includes an upper main flow channel (24) located at the bottom of the upper template (21) and cooperating with the lower main flow channel (8), upper cold material wells (25) located at both ends of the upper main flow channel (24), an upper secondary flow channel (26) located at the bottom of the upper template (21) and connecting the upper main flow channel (24) and the upper cavity (27), and an upper guide section (28) located at one end of the upper secondary flow channel (26) near the upper cavity (27).

4. The mold for coating iron parts according to claim 1, characterized in that: The lower mold assembly also includes a carrier plate (18) fixed to the top of the lower mold plate (6), a carrier groove (19) opened on the top of the carrier plate (18) for supporting the iron piece, and a clearance part (20) opened on the top of the carrier groove (19).

5. The mold for coating iron parts according to claim 1, characterized in that: The adjustment assembly also includes an adjustment plate (3) fixed on the opposite side of the baffle (4) and an adjustment groove (5) penetrating the adjustment plate (3).

6. The mold for coating iron parts according to claim 1, characterized in that: The ejection assembly includes an ejector hole (14) that passes through the lower template (6) and communicates with the lower cavity (11), a top plate (16) that is vertically mounted on the bottom of the lower template (6), an ejector rod (15) that is fixed to the top of the top plate (16) and passes through the ejector hole (14), and a spring (17) sleeved on the ejector rod (15). The spring (17) is located between the top plate (16) and the lower template (6).

7. The mold for coating iron parts according to claim 1, characterized in that: It also includes a guide hole (7) penetrating the lower template (6), a guide post (22) fixed to the bottom of the upper template (21) and cooperating with the guide hole (7), and a guide part (23) inclinedly disposed at the bottom of the guide post (22).

8. The mold for coating iron parts according to claim 1, characterized in that: The upper mold assembly also includes a mounting plate (32) embedded on the top of the upper mold plate (21), a feed rod (33) fixed to the bottom of the mounting plate (32), a feed port (34) opened on the top of the mounting plate (32), and a feed channel (35) passing through the feed rod (33) and connecting the feed port (34) and the upper flow channel.

9. A mold for coating iron parts according to claim 8, characterized in that: The feed channel (35) gradually expands in diameter from top to bottom.

Images