A gate cutting jig

Abstract

The utility model discloses a kind of sprue cutting jigs, including rack, driving part, ejector rod, cutting blade and buffer assembly;Driving part is fixed in rack, driving part connects ejector rod, and can drive ejector rod to move up and down;The end of ejector rod is used to fix cutting blade;Buffer assembly includes bottom plate, guide rod, limit nut, buffer and limit block;Guide rod is fixed in rack, and is parallelly arranged with ejector rod;Bottom plate is threaded guide rod, and can move up and down relative to guide rod;Buffer is close to guide rod setting, and located below bottom plate;Limit nut is threadedly cooperated with guide rod, and located above bottom plate;Limit block is symmetrically set relative to bottom plate, under the driving of driving part, cutting blade and bottom plate can cut, and bottom plate can be abutted with rack by limit block.The utility model technical scheme aims at reducing the impact force generated in the moment when blade cuts off sprue, improving cutting quality and reducing the maintenance cost of equipment.

Description

Technical Field

[0001] This utility model relates to the field of plastic product cutting fixture technology, and in particular to a gate cutting fixture. Background Technology

[0002] In the injection molding process of plastic products, the gate connecting the product and the runner needs to be removed in subsequent processes. Existing gate cutting fixtures are usually relatively simple in structure, with the cutting blade driven directly or through a rigid connection by a drive component. However, this direct punching method has obvious drawbacks: First, a huge impact force is generated at the moment the blade contacts and cuts off the gate. This rigid impact can easily cause defects such as whitening, stress cracking, or uneven cut surfaces in the plastic parts. At the same time, it will also accelerate the wear of the blade and cause tilted cutting, thereby damaging the product and affecting the cutting accuracy and quality. Utility Model Content

[0003] The purpose of this utility model is to provide a gate cutting fixture, which aims to reduce the impact force generated when the blade cuts the gate, improve the cutting quality, and reduce the maintenance cost of the equipment.

[0004] To achieve this objective, the present invention adopts the following technical solution: A gate cutting fixture includes a frame, a drive unit, a push rod, a cutting blade, and a buffer assembly; the drive unit is fixed to the frame, the drive unit is connected to the push rod, and can drive the push rod to move up and down; the end of the push rod is used to fix the cutting blade. The buffer assembly includes a base plate, a guide rod, a limiting nut, a buffer component, and a limiting block; The guide rod is fixed to the frame and is arranged parallel to the top rod; the base plate passes through the guide rod and can move up and down relative to the guide rod; the buffer is arranged close to the guide rod and is located below the base plate; the limiting nut is threadedly engaged with the guide rod and is located above the base plate; the limiting block is symmetrically arranged relative to the base plate, and under the drive of the driving member, the cutting blade can cut the base plate, and the base plate can abut against the frame through the limiting block.

[0005] In one embodiment, the end of the top rod is further provided with a first heating device; the cutting blade is installed in contact with the first heating device.

[0006] In one embodiment, the base plate is further provided with a second heating device and a heat-conducting strip; the heat-conducting strip is located above the heating device and is used to cooperate with the cutting blade.

[0007] In one embodiment, the limiting block is fixed to the frame and forms a first gap with the base plate.

[0008] In one embodiment, the limiting block is fixed to the base plate and forms a second gap with the frame.

[0009] In one embodiment, the buffer is a helical compression spring; the helical compression spring is sleeved on the guide rod, and both ends of the helical compression spring are respectively connected to the base plate and the frame.

[0010] Compared with the prior art, the present invention has the following beneficial effects: This utility model addresses the problems of product damage and severe blade wear caused by rigid impacts in existing fixtures. The gate cutting fixture of this invention effectively solves these defects by incorporating a buffer component. Specifically, when the drive unit moves the top rod, which houses the cutting blade, downwards for cutting, the workpiece first contacts the base plate. Then, as the drive unit continues to drive the cutting blade, the base plate compresses the buffer component below it and moves upwards along the guide rod until it is stopped by a limiting block against the frame. This process allows the buffer component to absorb and release some of the impact force generated during cutting, achieving buffered cutting and reducing the risk of product whitening and cracking while protecting the cutting blade. Simultaneously, the guide rod, parallel to the top rod, provides precise vertical guidance for the movement of the base plate, ensuring the relative parallelism between the base plate and the top rod during cutting. This ensures that the cutting blade always completes the cut in a vertical posture, reducing the risk of blade tilting and improving the flatness and quality of the cut surface. Furthermore, the reduced wear on the cutting blade due to impact forces reduces equipment maintenance costs. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0012] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0013] Figure 1 This is a schematic diagram of the structure of an embodiment of the gate cutting fixture of this utility model; Figure 2 This is a schematic diagram of another embodiment of the gate cutting fixture of this utility model; Illustration: 100, gate cutting fixture; 110, frame; 121, drive component; 122, push rod; 123, cutting blade; 124, first heating device; 130, buffer assembly; 131, base plate; 131a, heat-conducting strip; 132, guide rod; 133, limit nut; 134, buffer component; 135, limit block; 136, first gap. Detailed Implementation

[0014] To make the technical objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0015] In the description of this utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be a component centrally located at the same time.

[0016] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0017] This utility model embodiment provides a gate cutting fixture 100.

[0018] Please see Figure 1 and Figure 2 The gate cutting fixture 100 includes a frame 110, a drive component 121, a push rod 122, a cutting blade 123, and a buffer assembly 130. The drive component 121 is fixed to the frame 110, and is connected to the push rod 122, and can drive the push rod 122 to move up and down. The end of the push rod 122 is used to fix the cutting blade 123. The buffer assembly 130 includes a base plate 131, a guide rod 132, a limiting nut 133, a buffer component 134, and a limiting block 135; The guide rod 132 is fixed to the frame 110 and is arranged parallel to the top rod 122; the base plate 131 passes through the guide rod 132 and can move up and down relative to the guide rod 132; the buffer 134 is arranged close to the guide rod 132 and is located below the base plate 131; the limiting nut 133 is threadedly engaged with the guide rod 132 and is located above the base plate 131; the limiting block 135 is symmetrically arranged relative to the base plate 131. Under the drive of the driving member 121, the cutting blade 123 can cut the base plate 131, and the base plate 131 can abut against the frame 110 through the limiting block 135.

[0019] It is understood that the technical solution of this embodiment is based on the problem in the background art that existing fixtures are prone to product damage and severe blade wear due to rigid impact. The gate cutting fixture 100 of this technical solution effectively solves the above defects by setting a buffer component 130. Specifically, when the driving member 121 drives the top rod 122, which is equipped with the cutting blade 123, to move down for cutting, the workpiece first contacts the bottom plate 131. Then, as the driving member 121 continues to drive the cutting blade 123, the bottom plate 131 will compress the buffer component 134 below it and move upward along the guide rod 132 until it is stopped by the limiting block 135 and the frame 110. This process allows the buffer component 134 to absorb and release part of the impact force generated at the moment of cutting, realizing buffered cutting, thereby reducing the risk of product whitening and cracking and protecting the cutting blade 123. Meanwhile, the guide rod 132, parallel to the top rod 122, provides precise vertical guidance for the movement of the base plate 131, ensuring the relative parallelism between the base plate 131 and the top rod 122 during the cutting process. This, in turn, ensures that the cutting blade 123 always completes the cutting in a vertical posture, reducing the risk of the cutting blade 123 tilting and improving the flatness and quality of the cut surface. It can also be understood that the reduced wear of the cutting blade 123 due to the impact force achieves the technical effect of reducing equipment maintenance costs.

[0020] Specifically, the drive unit 121 is used to provide the linear motion required for cutting. Optionally, the drive unit 121 can be a cylinder, a hydraulic cylinder, an electric linear module, etc. One end of the push rod 122 is connected to the output end of the drive unit 121 and is driven by the drive unit 121 to perform up-and-down reciprocating linear motion, while the other end is used to mount the cutting blade 123.

[0021] Specifically, there are usually two or more guide rods 132, symmetrically arranged around the top rod 122. They are vertically installed on the frame 110 by means of interference fit, threaded connection or flange fixation, etc., to ensure that they are parallel to the movement direction of the top rod 122.

[0022] Specifically, the limiting nut 133 is used to limit the base plate 131, so that there is a certain upward buffering force between the base plate 131 and the buffer member 134, thereby improving the stability of the cutting process. On the other hand, the limiting nut 133 can be used to adjust the strength of the buffer member 134's anti-buffering force to adapt to anti-buffering cutting of workpiece gates of different sizes. Optionally, the guide rod 132 has threads, and the limiting nut 133 is threadedly engaged with the guide rod 132.

[0023] Specifically, the buffer 134 can be a component with elastic and damping characteristics, such as a helical compression spring, a polyurethane rubber pad, a nitrogen spring, or a hydraulic damper. Its initial state is usually a free state.

[0024] In practical operation, when the cutting blade 123 contacts the gate, the impact force forces the base plate 131 to compress the buffer 134 and slightly retract along the guide rod 132. The buffer 134 effectively absorbs and dissipates some of the impact energy, mitigating the problems of plastic part whitening, cracking, and cutting blade 123 chipping caused by rigid impact. At the same time, the guide rod 132, which is parallel to the push rod 122, ensures that the base plate 131 and the workpiece above it remain perpendicular to the cutting blade 123 throughout the entire cutting process, reducing the risk of blade tilting and ensuring the flatness of the cut surface. Furthermore, the contact between the limiting block 135 and the frame 110 ensures precise consistency of the cutting depth.

[0025] Please see Figure 1 In one specific embodiment, a first heating device 124 is also provided at the end of the top rod 122; the cutting blade 123 is installed in contact with the first heating device 124.

[0026] It is understood that the first heating device 124 can be a tubular heater, which can be embedded in the mounting groove at the end of the ejector pin 122 and transfer heat to the ejector pin 122 and the blade through heat conduction. Alternatively, it can be a thin-film heater, which is attached to the mounting surface at the end of the ejector pin 122 and fitted to the cutting blade 123. Furthermore, the heated cutting blade 123 can locally soften and melt the plastic at the moment of contact with the gate, thereby effectively reducing the force required for cutting and alleviating the impact load borne by the buffer 134; at the same time, the hot blade cutting can produce a smooth and sealed cut surface, completely avoiding defects such as material stringing, burrs, whitening, or cracking that may be caused by cold cutting, significantly improving the appearance quality and yield of the product.

[0027] Optionally, the base plate 131 is also provided with a second heating device (not shown) and a heat-conducting strip 131a; the heat-conducting strip 131a is located above the heating device and is used to cooperate with the cutting blade 123.

[0028] It is understandable that the second heating device is a heating rod, which can be embedded in a meandering channel drilled inside the base plate 131 to achieve uniform heating of the entire base plate 131.

[0029] Furthermore, the heat-conducting strip 131a can be a long strip made of brass or aluminum alloy. Its main function is to quickly and evenly conduct the heat generated by the second heating device to a more concentrated and specific area, thereby achieving cooperation with the cutting blade 123. The setting of the heat-conducting strip 131a provides a locally heated cutting support area for gate cutting. When used to cut plastic gates, the heated heat-conducting strip 131a can preheat and keep the root of the gate from below, thereby greatly reducing the force required for the cutting process and almost achieving a thermal melting cutting effect. This not only reduces the load on the drive component 121 and the impact vibration on the entire fixture, but more importantly, it can produce an extremely smooth, flat, and stress-free cut surface, further eliminating defects such as stringing, burrs, or deformation caused by material toughness.

[0030] Please see Figure 1 Specifically, the limiting block is fixed to the frame 110 and forms a first gap 136 with the base plate 131.

[0031] Optionally, please refer to Figure 2 The limiting block is fixed to the base plate 131 and forms a second gap with the frame 110.

[0032] It is understandable that the first gap 136 or the second gap is set in order to control the buffer stroke of the base plate 131 and avoid excessive stroke that could cause cutting failure.

[0033] Preferably, the buffer 134 is a helical compression spring; the helical compression spring is sleeved on the guide rod 132, and the two ends of the helical compression spring are respectively connected to the base plate 131 and the frame 110.

[0034] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A gate cutting fixture, characterized in that, It includes a frame, a drive unit, a push rod, a cutting blade, and a buffer assembly; the drive unit is fixed to the frame, the drive unit is connected to the push rod, and can drive the push rod to move up and down; the end of the push rod is used to fix the cutting blade. The buffer assembly includes a base plate, a guide rod, a limiting nut, a buffer component, and a limiting block; The guide rod is fixed to the frame and is arranged parallel to the top rod; the bottom plate passes through the guide rod and can move up and down relative to the guide rod; the buffer is arranged close to the guide rod and is located below the bottom plate; the limiting nut is threadedly engaged with the guide rod and is located above the bottom plate. The limiting block is symmetrically arranged relative to the base plate. Under the drive of the driving member, the cutting blade can cut the base plate, and the base plate can abut against the frame through the limiting block.

2. The gate cutting fixture as described in claim 1, characterized in that, The end of the top rod is also provided with a first heating device; the cutting blade is installed in conjunction with the first heating device.

3. The gate cutting fixture as described in claim 1, characterized in that, The base plate is also equipped with a second heating device and heat-conducting strips; The heat-conducting strip is located above the heating device and is used to cooperate with the cutting blade.

4. The gate cutting fixture as described in claim 1, characterized in that, The limiting block is fixed to the frame and forms a first gap with the base plate.

5. The gate cutting fixture as described in claim 1, characterized in that, The limiting block is fixed to the base plate and forms a second gap with the frame.

6. The gate cutting fixture as described in claim 1, characterized in that, The buffer component is a helical compression spring; the helical compression spring is sleeved on the guide rod, and the two ends of the helical compression spring are respectively connected to the base plate and the frame.

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