Material pipe forming machine head capable of achieving accurate adjustment of discharging gram weight

Abstract

The utility model belongs to the technical field of blow molding production equipment, and relates to a material pipe forming machine head capable of realizing accurate adjustment of discharge gram weight, which is characterized in that a mold core jacket is fixed at the lower end of a lower rack, the upper part of a mold core is inserted and matched with an inner hole of the mold core jacket, and a blanking cavity is formed between the mold core jacket and the mold core jacket; the outer die sleeve support is in penetrating fit with the lower rack in an up-down movable mode, a nut piece is fixed to the top of the outer die sleeve support, the bottom of the outer die sleeve support is fixedly connected with the outer die sleeve, and the nut piece is connected with a transmission shaft through threads; the outer die sleeve is in clearance sleeving fit with the lower part of the die core to form a material pipe forming cavity, and the blanking cavity is communicated with the material pipe forming cavity in an up-and-down sealing manner; the gram weight adjusting mechanism adopts a worm gear and worm transmission mechanism, a worm gear is arranged in an inner cavity of the upper rack and coaxially fixed on a transmission shaft, two shaft ends of a worm are matched with the front side wall and the rear side wall of the upper rack in a rotating and supporting mode, and the front portion of the front shaft end of the worm extends out of the front side of the upper rack and is provided with an adjusting hand wheel. The machine head is convenient to adjust, and the discharging gram weight adjusting precision can be improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of blow molding production equipment, specifically relating to a material tube forming mechanism that can achieve precise adjustment of the output weight. Background Technology

[0002] The tube forming die head is a crucial structure in blow molding production equipment. It molds molten plastic into a cylindrical tube, which is then fed into the mold closing device. In the mold cavity, air is blown to complete the blow molding process. The tube forming die head primarily forms the cylindrical tube through an annular gap between the mold core and an outer mold sleeve located outside the mold core. By adjusting the relative axial positions of the outer mold sleeve and the mold core, the gap size can be adjusted, thereby adjusting the tube wall thickness and, consequently, the output weight. Currently, the vertical position of the mold core is generally fixed, while the vertical position of the outer mold sleeve is adjusted to regulate the gap. Existing outer mold sleeve adjustment mechanisms employ a screw and nut adjustment structure. The outer mold sleeve is mounted at the lower end of a mold sleeve support, which is connected to the machine frame via multiple guide rods. A nut is installed at the upper end of the mold sleeve support, and the nut is threadedly connected to a screw rod mounted on the machine frame.

[0003] For medium to large-sized blow molding equipment, the tube forming die head is typically positioned high. However, existing external mold sleeve adjustment mechanisms are located at the top of the die head, making adjustment inconvenient and difficult. During adjustment, it's difficult to observe changes in the tube wall thickness at the outlet, and the adjustment precision is insufficient. Furthermore, weight fluctuations are prone to occur during production, resulting in poor uniformity of product wall thickness and impacting product quality. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by proposing a tube forming head that is easy to adjust and improves the accuracy of discharge weight adjustment, enabling precise adjustment of discharge weight.

[0005] The above-mentioned objective of this utility model is achieved through the following technical solution:

[0006] A tube forming head capable of precise adjustment of output weight includes a frame, an outer mold sleeve, an outer mold sleeve support, a mold core, a mold core outer sleeve, and a weight adjustment mechanism;

[0007] The frame includes an upper frame and a lower frame; the upper frame and the lower frame are fixedly connected; the lower frame is provided with a liquid input channel, which is connected to a liquid inlet located on the side of the lower frame;

[0008] The mold core sleeve is fixed to the lower end of the lower frame, and the upper part of the mold core is inserted into the inner hole of the mold core sleeve, forming a feeding cavity that communicates with the liquid input channel.

[0009] The outer sleeve support is movably connected with the lower frame, the top of the outer sleeve support is fixed with a nut part, and the bottom of the outer sleeve support is fixedly connected with the outer sleeve; the nut part is threadedly connected with a transmission shaft;

[0010] The outer sleeve is sleeved with the lower part of the mold core, and a material pipe forming cavity is formed between the outer sleeve and the lower part of the mold core.

[0011] The gram weight adjusting mechanism adopts a worm and gear transmission mechanism, the worm gear is coaxially fixedly connected with the upper end of the transmission shaft, the two shaft ends of the worm are rotatably supported with the front side wall and the rear side wall of the upper frame and are engaged with the worm gear, and the front shaft end of the worm extends from the front side of the upper frame and is provided with an adjusting hand wheel.

[0012] Moreover, the outer sleeve support is composed of a top plate, a bottom plate and a plurality of guide rods connecting the top plate and the bottom plate, the top plate is arranged between the upper frame and the lower frame, the bottom plate is arranged below the lower frame, and the plurality of guide rods are sleeved with vertical guide holes arranged on the lower frame.

[0013] Moreover, the upper frame and the lower frame are connected through a plurality of supporting legs.

[0014] The utility model has the advantages and positive effects that:

[0015] 1. The utility model adopts the cooperation structure of worm and gear to adjust the gram weight, based on the large transmission ratio of worm and gear transmission, compared with the adjusting mode of the existing single screw nut, the micro-adjusting control of the up-down movement of the outer sleeve can be realized, so that the accurate adjustment of the gram weight is achieved.

[0016] 2. The adjusting hand wheel of the utility model is installed on the front side of the machine head, so that the operator standing on the front side of the machine head can complete the adjustment, and the discharging condition of the material pipe can be observed during the gram weight adjustment process, so that the operation of the discharging gram weight adjustment is facilitated.

[0017] 3. The utility model adopts the cooperation structure of worm and gear to adjust the gram weight, based on the self-locking property of worm and gear transmission, the problem of gram weight fluctuation in the production process is also reduced, so that the uniformity and consistency of the product wall thickness can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is the overall front view of the utility model;

[0019] Figure 2 It is the overall perspective view of the utility model;

[0020] Figure 3 It is the structure diagram of the utility model without the gram weight adjusting mechanism of the upper frame;

[0021] Figure 4 is the reference diagram of the cooperation of the outer sleeve and the mold core;

[0022] In the figure: 1, lower rack; 2, support leg; 3, upper rack; 4, adjusting hand wheel; 5, worm; 6, transmission shaft; 7, top plate; 8, guide rod; 9, bottom plate; 10, outer sleeve; 11, worm gear; 12, nut part; 13, mold core outer sleeve; 14, discharging cavity; 15, mold core; 16, pipe forming cavity. DETAILED DESCRIPTION

[0023] The structure of the utility model is further described below in combination with the drawings and by examples. It should be noted that the examples are narrative rather than limiting.

[0024] A pipe forming machine head capable of realizing accurate adjustment of discharging gram weight, please see Figures 1-4 The utility model discloses a kind of pipe forming machine heads, which can realize accurate adjustment of discharging gram weight, and its invention point is: including rack, outer sleeve 10, outer sleeve support, mold core 15, mold core outer sleeve 13 and gram weight adjusting mechanism.

[0025] The rack includes upper rack 3 and lower rack 1, and the upper rack 3 is a box-type rack with an installation cavity inside. The lower rack 1 is internally provided with a liquid inlet channel, which is in communication with a liquid inlet opening arranged on the side of the lower rack 1. The upper rack 3 and the lower rack 1 are spaced apart and fixedly connected. In the utility model, the upper rack 3 and the lower rack 1 are connected by a plurality of support legs 2 near the edge.

[0026] The mold core outer sleeve 13 is fixed to the lower end of the lower rack 1, and the upper part of the mold core 15 is inserted and fitted with the inner hole of the mold core outer sleeve 13, forming a discharging cavity 14 in communication with the liquid inlet channel between the two.

[0027] The outer sleeve support is movably connected to the lower rack 1, and the top of the outer sleeve support is fixedly connected to the nut part 12, and the bottom of the outer sleeve support is fixedly connected to the outer sleeve 10. In the utility model, the outer sleeve support is preferably composed of a top plate 7, a bottom plate 9, and a plurality of guide rods 8 connecting the top plate 7 and the bottom plate 9. The top plate 7 is arranged between the upper rack 3 and the lower rack 1, the bottom plate 9 is arranged below the lower rack 1, and the plurality of guide rods 8 are fitted with the vertical guide holes arranged on the lower rack 1. The lower part of the transmission shaft 6 is provided with external threads, which are connected to the nut part 12 by threads.

[0028] The outer sleeve 10 is fixedly installed at the lower end of the bottom plate 9 and gap-fitted with the lower part of the mold core 15, forming a pipe forming cavity 16 between the two, which gradually decreases from top to bottom. The pipe forming cavity 16 is in sealed communication with the discharging cavity 14 above and below.

[0029] The gram weight adjusting mechanism adopts a worm and gear transmission mechanism, the worm wheel 11 is arranged in the inner cavity of the upper rack 3, the worm wheel 11 is coaxially fixedly connected with the upper end of the transmission shaft 6, the two shaft ends of the worm 5 are rotationally supported and matched with the front side wall and the rear side wall of the upper rack 3, and are engaged with the worm wheel 11, the front part of the front shaft end of the worm 5 extends out of the front side of the upper rack 3, and the adjusting hand wheel 4 is installed.

[0030] The material pipe forming head is suitable for single mold group and multi-mold group structures, the embodiment is a four-mold group structure, a group of gram weight adjusting mechanisms are arranged corresponding to each group of mold groups, and the discharge gram weight can be adjusted respectively.

[0031] In addition, the middle part of the mold core 15 is also provided with a gas blowing passage communicated with the lower end of the mold core, which is communicated with the gas inlet passage arranged in the lower rack 1, and gas is blown into the downwardly hanging forming material pipe to avoid the adhesion of the material pipe.

[0032] The working principle of the material pipe forming head capable of realizing accurate adjustment of the discharge gram weight is as follows:

[0033] The material pipe forming head inputs the molten plastic raw material through the liquid inlet of the side part of the lower rack, the input plastic raw material sequentially passes through the material liquid input channel, the discharging cavity 14 and the material pipe forming cavity 16 from top to bottom, forms a thin-walled material pipe in the material pipe forming cavity 16, and is then output through the lower end of the material pipe forming cavity 16. The upper rack 3, the lower rack 1, the mold core 15 and the mold core sleeve 13 in the material pipe forming head are fixed parts, the outer mold sleeve 10 and the outer mold sleeve support are movable parts for realizing accurate adjustment of the gram weight, the outer mold sleeve support can move up and down through the cooperation of the plurality of guide rods of the outer mold sleeve support and the vertical guide holes arranged on the lower rack, and the gram weight adjusting mechanism is a driving mechanism for driving the outer mold sleeve and the outer mold sleeve support to move up and down in a small amount. When accurate adjustment of the discharge gram weight is needed, the adjusting hand wheel 4 is rotated to drive the worm 5 to rotate, the transmission shaft 6 is driven to rotate through the engagement of the worm 5 and the worm wheel 11, the nut part 12 fixed to the upper part of the outer mold sleeve support is driven to rotate through the thread engagement between the transmission shaft and the nut part, so that the outer mold sleeve support and the outer mold sleeve can move up and down in a small amount, the up and down movement of the outer mold sleeve can change the area of the lower end of the material pipe forming cavity 16 formed by the outer mold sleeve and the mold core 15, so as to realize the adjustment of the wall thickness of the material pipe, and finally realize the accurate control of the discharge gram weight.

[0034] Although the embodiments and drawings of the utility model are disclosed for the purpose of illustration, those skilled in the art can understand that various substitutions, changes and modifications are possible without departing from the spirit of the utility model and the appended claims, therefore, the scope of the utility model is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A spooler head capable of achieving accurate adjustment of the discharge coat weight, characterized in that: The machine frame comprises a machine frame, an outer sleeve (10), an outer sleeve support, a mold core (15), a mold core sleeve (13) and a grammage adjusting mechanism. The machine frame comprises an upper machine frame (3) and a lower machine frame (1); the upper machine frame (3) and the lower machine frame (1) are fixedly connected; the lower machine frame (1) is internally provided with a liquid input channel, which is in communication with a liquid inlet arranged on the side of the lower machine frame (1); The mold core sleeve (13) is fixed to the lower end of the lower machine frame (1), and the upper portion of the mold core (15) is inserted and fitted with the inner hole of the mold core sleeve (13), forming a discharging cavity (14) in communication with the liquid input channel; The outer sleeve support is movably fitted with the lower machine frame (1) in an up-down manner, and the top of the outer sleeve support is fixed with a nut member (12), and the bottom of the outer sleeve support is fixedly connected with the outer sleeve (10); the nut member (12) is threadedly connected with a transmission shaft (6); The outer sleeve (10) is gap-fitted with the lower portion of the mold core (15), forming a pipe forming cavity (16) between the outer sleeve (10) and the mold core (15), and the discharging cavity (14) is in sealed communication with the pipe forming cavity (16) in an up-down manner; The grammage adjusting mechanism adopts a worm and gear transmission mechanism, the worm gear (11) is coaxially fixedly connected with the transmission shaft (6), the two shaft ends of the worm (5) are rotatably supported with the front and rear side walls of the upper machine frame (3) and are in meshing engagement with the worm gear (11), and the front shaft end of the worm (5) is protruded from the front side of the upper machine frame (3) and is provided with an adjusting hand wheel (4).

2. A spooler head enabling precise adjustment of the discharge grammage according to claim 1, characterized in that: The outer sleeve support is composed of a top plate (7), a bottom plate (9) and a plurality of guide rods (8) connecting the top plate (7) and the bottom plate (9); the top plate (7) is arranged between the upper machine frame (3) and the lower machine frame (1), the bottom plate (9) is arranged below the lower machine frame (1), and the plurality of guide rods (8) are fitted with vertical guide holes arranged on the lower machine frame (1).

3. A spooler head enabling precise adjustment of the discharge grammage according to claim 1, characterized in that: The upper machine frame (3) and the lower machine frame (1) are connected through a plurality of support legs (2).

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