Dispensing needle wiping and cleaning apparatus

Abstract

The application discloses a dispensing needle head wiping and cleaning device, which aims at overcoming the problem that the prior art dispensing head automatic wiping and cleaning device cannot utilize both sides of a cleaning cloth belt, and provides a dispensing needle head wiping and cleaning device which can utilize both sides of the cleaning cloth belt to improve the utilization rate of the cleaning cloth belt and reduce the production cost. The structure comprises a cloth clamping device, a pair of clamping blocks which can be relatively translated to be close to each other, a through groove extending along the translation direction of the two clamping blocks is arranged in the middle part of each clamping block, and the cleaning cloth belt vertically passes through the through grooves of the two clamping blocks in sequence. A cloth hooking device is arranged between the two clamping blocks, the cloth hooking device comprises movable hook claws arranged on both sides of the cleaning cloth belt, and a reciprocating driving mechanism which drives the movable hook claws to reciprocate in the gap between the two clamping blocks.

Description

TECHNICAL FIELD

[0001] The present application relates to the dispensing technology field, and in particular to a device for automatic cleaning of a dispensing head. BACKGROUND

[0002] The dispensing machine is mainly used for precisely dispensing, injecting, coating and dripping glue, paint and other liquids to each product in the product process, and can be used to realize dotting, line drawing, circle or arc.

[0003] After the dispensing machine is used for a period of time, glue will be left on the dispensing needle head, and when the left glue is too much, the dispensing accuracy will be affected, and then the product quality will be affected. In addition, the left glue will solidify after being in contact with air for a long time, thereby causing the needle nozzle to be blocked, which is not conducive to subsequent work. Therefore, the needle head must be cleaned in time when dispensing. The existing cleaning method is generally manual wiping and cleaning, which not only needs to stop the machine and disassemble the needle head, but also has slow cleaning speed and unclean cleaning, thereby greatly affecting the production efficiency.

[0004] At present, the commonly used cleaning mechanism for the double dispensing needle head in the vertical direction mainly includes the following modes: cylinder clamping needle head pulling and inserting cleaning, high-pressure jet cleaning, double roller cleaning and the like. The cylinder clamping needle head pulling and inserting cleaning can only clean the two sides of the needle head at a time, and the other two sides cannot be cleaned, and manual cleaning with a dust-free cloth in the equipment is needed. However, such an operation mode will cause more safety problems. The high-pressure jet cleaning uses high-pressure airflow to blow the left glue on the needle nozzle away from the needle head. Although this mode can solve the problem of cleaning the two sides at a time, since the flow direction of the high-pressure airflow cannot be accurately controlled, turbulence is easily formed in the inside of the recovery bin, which causes the spread of glue and other dirt, thereby making the cleaning effect not ideal. In addition, due to the limited suction force, the cleaning effect of the glue with high viscosity is not good. The double roller cleaning mode is to insert the needle head into the gap between a pair of rollers sleeved with sponge sleeves for cleaning. The sponge material can be extruded and rotated to completely clean the needle head. However, the sponge sleeve will be contaminated by the glue after a short period of cleaning, the effective time is short, the replacement frequency is high, the production efficiency is reduced, and the use cost is increased.

[0005] For example, Chinese Patent No. CN105436037B discloses a needle cleaning mechanism and a dispensing machine. At least three pulleys are used to fold the material belt into a U shape. The middle of the U-shaped material belt is used for inserting the dispensing needle to be cleaned. The two sides of the U-shaped material belt are respectively provided with clamping heads for clamping the material belt and the dispensing needle, and the dispensing needle is wiped.

[0006] The above scheme is a common scheme in the prior art, and the defects of this scheme are as follows:

[0007] (1) Utilize one side of the cleaning cloth belt, the other side of the cleaning cloth belt is wasted, and the production cost cannot be reduced to the maximum extent.

[0008] (2) Since three pulleys are needed to fold the material belt into a U-shaped section, the wiping contact points on both sides of the clamped cleaning cloth belt have a large interval between the cloth belts. In the cleaning cloth belt step distance control, if the step interval is less than the length of the U-shaped section, a higher precision step distance control method is needed, otherwise the cloth belt may be transported to the area that has been used on the side behind the U-shaped section again, which may lead to repeated use and affect the wiping effect. If the step interval is greater than the length of the U-shaped section, a large area in the U-shaped section is wasted. SUMMARY

[0009] The present application is to overcome the deficiency that the positive and negative surfaces of the cleaning cloth belt cannot be utilized in the existing point glue needle head wiping and cleaning device, and to provide a point glue needle head wiping and cleaning device capable of utilizing both surfaces of the cleaning cloth belt for wiping, improving the utilization rate of the cleaning cloth belt, and reducing the production cost.

[0010] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0011] The point glue needle head wiping and cleaning device of the present application comprises a feeding disc, a collecting disc, a guide pulley set, a cleaning cloth belt, and a tensioning mechanism. The cleaning cloth belt is wound from the feeding disc to the collecting disc through the guide pulley set. The device is characterized in that it further comprises:

[0012] A cloth clamping device comprising a pair of clamping blocks that can be translated towards each other. The middle part of each clamping block is provided with a through slot extending in the translation direction. The cleaning cloth belt passes through the through slots of the two clamping blocks in sequence.

[0013] A cloth hooking device located between the two clamping blocks. The cloth hooking device comprises movable hook claws arranged on both sides of the cleaning cloth belt, and a reciprocating driving mechanism for driving the movable hook claws to reciprocate in the gap between the two clamping blocks. When the cloth hooking device moves to the side of the positive or negative surface of the cleaning cloth, the cleaning cloth forms a U-shaped structure between the two clamping blocks, and the U-shaped structure of the cleaning cloth is used to insert the point glue needle head to be wiped.

[0014] As a preferred embodiment, the guide pulley set comprises a double pulley structure arranged on one side of the cloth clamping device for clamping the cleaning cloth belt. The cloth clamping device is arranged above a swing mechanism. The swing mechanism can drive the cloth clamping device to swing towards the positive or negative surface of the cleaning cloth belt. When the swing mechanism drives the cloth clamping device to swing to the positive surface side of the cleaning cloth belt, the cloth hooking device moves to the negative surface side of the cleaning cloth. When the swing mechanism drives the cloth clamping device to swing to the negative surface side of the cleaning cloth belt, the cloth hooking device moves to the positive surface side of the cleaning cloth.

[0015] As preferred, the cloth clamping device comprises a base, two clamping blocks are slidingly connected to the base, the base is provided with a sliding groove between the two clamping blocks, the reciprocating driving mechanism comprises a sliding seat and a rodless cylinder, the sliding seat and the rodless cylinder are arranged in the sliding groove, the rodless cylinder drives the sliding seat to reciprocate along the sliding groove below the cleaning cloth belt, and each end of the sliding seat is provided with a pair of rotatable movable hooks.

[0016] As preferred, the movable hooks are provided with a reset torsional spring to reset the movable hooks to a state in which the hook tips are transversely arranged to the outside, each end of the sliding groove is provided with a top block, the outside edge of the movable hooks towards the end of the sliding groove is in a slope structure, the inside edge of the movable hooks away from the end of the sliding groove is provided with a limiting notch, and the middle of the sliding seat is provided with an elastically reset limiting buckle, when the movable hooks are rotated to a vertical upward state, the limiting buckle and the limiting notch are buckled.

[0017] As preferred, each side of the sliding seat is provided with a limiting buckle between the two movable hooks on the same side, the limiting buckle comprises a U-shaped part and a pair of buckle ends symmetrically arranged at both ends of the U-shaped part, the inside of the U-shaped part is provided with a transversely arranged sliding telescopic rod, the sliding telescopic rod is connected to the sliding seat, and a top rod is arranged below the clamping block at a height position corresponding to the U-shaped part.

[0018] As preferred, the inside surface of the clamping block is provided with a recessed step at the lower edge, the top rod is arranged at the step of the clamping block and is slidingly connected to the clamping block, the end of the top rod is provided with a boss, and the inside of the boss is sleeved with a spring.

[0019] As preferred, the cloth clamping device comprises a pneumatic finger cylinder, and the two clamping blocks are respectively connected to the finger parts of the pneumatic finger cylinder.

[0020] In this scheme, the cloth hooking device reciprocates between the two clamping blocks to alternately hook part of the cleaning cloth to one side of the front or back of the cloth, thereby alternately forming a U-shaped structure on the path of the clamping blocks for wiping with the front or back of the cloth. When the cloth hooking device inserts the glue dispensing needle to be cleaned into the middle of the U-shaped structure, the front or back of the cleaning cloth is fully utilized.

[0021] For example, when wiping is needed, the cloth hooking device hooks the cleaning cloth to the back side to form a U-shaped structure, the glue dispensing needle is inserted into the U-shaped structure at this time, and the clamping blocks on both sides are close to clamp the glue dispensing needle with the front of the cleaning cloth for wiping. When the cloth hooking device hooks the cleaning cloth to the front side to form a U-shaped structure, the back of the cleaning cloth is used for wiping. In this way, the front and back of the cleaning cloth can be alternately used to improve the utilization rate of materials and reduce production costs. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 This is a partial top view of the dispensing needle wiping and cleaning device of the present invention.

[0023] Figure 2 This is a structural diagram of the sliding seat and movable hook in the hook-and-cloth device of the present invention.

[0024] Figure 3 This is a diagram showing the first working state of the hook and loop device in this invention.

[0025] Figure 4 This is a diagram showing the second working state of the hook and loop device in this invention.

[0026] Figure 5 This is a diagram showing the third working state of the hook and loop device in this invention.

[0027] Figure 6 This is a diagram showing the fourth working state of the hook and loop device in this invention.

[0028] The diagram is labeled as follows: 1. Fabric clamping device; 101. Clamping block; 102. Pneumatic finger cylinder; 103. Top rod; 104. Base; 105. Through groove; 106. Slide groove; 107. Top block; 2. Fabric hooking device; 201. Movable hook; 202. Sliding seat; 203. Rodless cylinder; 204. Return torsion spring; 205. Limiting notch; 206. Limiting fastener; 207. Sliding telescopic rod; 3. Double pulley structure; 4. Cleaning cloth belt; 5. Glue dispensing needle. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 As shown, a dispensing needle wiping and cleaning device of the present invention includes a feeding tray, a receiving tray, a guide pulley group, a cleaning cloth 4, and a tensioning mechanism. The cleaning cloth 4 is output from the feeding tray, passes through the guide pulley group, and winds onto the receiving tray. The device is characterized by further comprising:

[0031] The cloth clamping device 1 includes a pair of clamping blocks 101 that can move closer to each other. Each of the two clamping blocks 101 has a through groove 105 extending along its translational direction in the middle. The cleaning cloth 4 passes vertically through the through groove 105 of the two clamping blocks 101 in sequence.

[0032] The hooking device 2 is located between the two clamping blocks 101, and includes movable clamping jaws 201 arranged on both sides of the cleaning cloth tape 4, and a reciprocating driving mechanism for driving the movable clamping jaws 201 to reciprocate in the gap between the two clamping blocks 101. When the hooking device 2 moves to one side of the front or back of the cleaning cloth, the cleaning cloth forms a U-shaped structure between the two clamping blocks 101, and the U-shaped structure of the cleaning cloth is used for inserting the glue dispensing needle 5 to be wiped.

[0033] In this scheme, the hooking device 2 reciprocates between the two clamping blocks 101, and alternately hooks part of the cleaning cloth to one side of the front or back thereof, so as to alternately form a U-shaped structure for wiping with the front or back of the cloth on the path of the clamping block 101. When the hooking device 2 inserts the glue dispensing needle 5 to be cleaned into the U-shaped structure, the front or back of the cleaning cloth tape 4 is fully utilized.

[0034] For example, when wiping is needed, the hooking device 2 hooks the cleaning cloth tape 4 to the back side to form a U-shaped structure, and the glue dispensing needle 5 is inserted into the U-shaped structure at this time. The two clamping blocks 101 are close to each other, so that the front of the cleaning cloth tape 4 clamps the glue dispensing needle 5 for wiping. When the hooking device 2 hooks the cleaning cloth tape 4 to the front side to form a U-shaped structure, the back of the cleaning cloth tape 4 is used for wiping. In this way, the front and back of the cleaning cloth tape 4 can be alternately used, the utilization rate of the material is improved, and the production cost is reduced.

[0035] The guide pulley block includes a double pulley structure 3 arranged on one side of the cloth clamping device 1 for clamping the cleaning cloth tape 4. The cloth clamping device 1 is arranged above a swinging mechanism, and the swinging mechanism can drive the cloth clamping device 1 to swing to the front or back of the cleaning cloth tape 4. When the swinging mechanism drives the cloth clamping device 1 to swing to the front of the cleaning cloth tape 4, the hooking device 2 moves to the back of the cleaning cloth. When the cloth clamping device 1 swings to the back of the cleaning cloth tape 4, the hooking device 2 moves to the front of the cleaning cloth.

[0036] When the hooking device 2 alternately hooks the cleaning cloth tape 4 to both sides, the position of the glue dispensing needle 5 for wiping the cleaning U-shaped structure alternately switches between the two sides of the cleaning cloth path. Therefore, the glue dispensing needle 5 needs to be controlled to switch back and forth between the two wiping positions, which is low in control efficiency and may cause the needle to touch the components and be damaged. Therefore, the swinging mechanism and the hooking device 2 are used to move in opposite directions, so as to compensate for the position deviation of the cleaning cloth tape 4 to the two U-shaped structures, so that the glue dispensing needle 5 only needs to be positioned at the same wiping position each time.

[0037] As Figure 2As shown, the cloth clamping device 1 comprises a base 104, two clamping blocks 101 slidingly connected to the base 104, the base 104 being provided with a sliding groove 106 between the two clamping blocks 101, the reciprocating driving mechanism comprising a sliding seat 202 and a rodless cylinder 203, the sliding seat 202 and the rodless cylinder 203 being arranged in the sliding groove 106, the rodless cylinder 203 driving the sliding seat 202 to reciprocate along the sliding groove 106 below the cleaning cloth belt 4, the two ends of the sliding seat 202 being respectively provided with a pair of rotatable movable hooks.

[0038] The movable hooks are provided with a reset torsion spring 204 for resetting the movable hooks to a state in which the hook tips are transversely arranged outwardly, each end of the sliding groove 106 is provided with a top block 107, the outer edge of the movable hooks towards the end of the sliding groove 106 is in a slope structure, the inner edge of the movable hooks away from the end of the sliding groove 106 is provided with a limiting gap 205, the middle part of the sliding seat 202 is provided with an elastically resettable limiting buckle 206, when the movable hooks are rotated to a vertically upward state, the limiting buckle 206 and the limiting gap 205 are buckled.

[0039] The two sides of the sliding seat 202 are respectively provided with a limiting buckle 206 between the two movable hooks on the same side, the limiting buckle 206 comprises a U-shaped part and a pair of buckle end parts symmetrically arranged at the two ends of the U-shaped part, the inner side of the U-shaped part is provided with a transversely arranged sliding telescopic rod 207, the sliding telescopic rod 207 is connected to the sliding seat 202, the top rod 103 is arranged below the clamping block 101 at a height position corresponding to the U-shaped part.

[0040] The limiting buckle 206 is made of a material with certain elasticity such as plastic or plastic, the two sides of the buckle end parts can have certain elasticity by using the U-shaped part structure, and the buckle end parts will not interfere with the rotation of the movable hooks until being buckled into the limiting gap 205 of the movable hooks by using the elasticity.

[0041] The inner side surface of the clamping block 101 is provided with a recessed step, the top rod 103 is arranged at the step of the clamping block 101 and is slidingly connected to the clamping block 101, the end of the top rod 103 is provided with a boss, and the top rod 103 is sleeved with a spring inside the boss.

[0042] The top rod 103 is used to press the limiting buckle 206 for a short time before the clamping block 101 contacts the movable hooks, so that the limiting buckle 206 slides inward to release the limiting action on the movable hooks. Thereafter, the positions of the top rod 103 and the limiting buckle 206 can be further contracted inward without affecting the clamping of the cleaning cloth belt 4 by the clamping block 101.

[0043] The cloth clamping device 1 comprises a pneumatic finger cylinder 102, and the two clamping blocks 101 are respectively connected to the finger parts of the pneumatic finger cylinder 102.

[0044] As Figures 3-6 The workflow is shown. The movable hook is in the horizontal state under the action of the reset torsion spring 204, and when the sliding seat 202 moves, it does not interfere with the cleaning cloth tape 4 between the two clamping blocks 101. When the front surface of the cleaning cloth tape 4 needs to be wiped, the sliding seat 202 is first slid to the end of the sliding groove 106 on the side of the front surface of the cleaning cloth tape 4, and the inclined surface structure of the top block 107 is used to top the movable hook, so that the movable hook is upright to the limit buckle 206 and the limit notch 205. At this time, the sliding seat 202 slides to the back surface side of the cleaning cloth tape 4, so that the movable hook hooks the front surface of the cleaning cloth tape 4 to the back surface side, and the limit action of the through slot 105 on the two clamping blocks 101 makes the cleaning cloth tape 4 form a U-shaped structure.

[0045] The limit buckle 206 can translate along the clamping block 101 in the approaching direction under the action of the sliding telescopic rod 207. During the approaching process of the clamping blocks 101, the top rod 103 will first press the limit buckle 206 inward, so that it is separated from the limit notch 205 of the movable hook, and the limit of the movable hook is released. The movable hook can be reset to the horizontal state before the clamping blocks 101 approach, so as to avoid interference with the action of the clamping blocks 101. At this time, the recovered cleaning cloth tape 4 is temporarily hooked by the dispensing needle 5. Since the time is very short, the dispensing needle 5 will not be damaged, and the wiping effect on the side surface of the dispensing needle 5 can be enhanced. At the same time, the position of the dispensing needle 5 can be set between the movable hooks, and the movable hooks can hook the cleaning cloth tape 4 with a smaller length to form a U-shaped structure much smaller than the prior art. The U-shaped structure section for wiping in the present scheme only needs to accommodate the dispensing needle 5, and does not need to additionally accommodate the tension pulley. As long as the width of the dispensing needle 5 can be covered, the wiping effect can be guaranteed. The surface utilization rate of the cleaning cloth tape 4 is greatly improved. The cleaning cloth tape 4 with a step distance greater than the length of the U-shaped section can be used to prevent the wiping area of the cleaning cloth tape 4 from being repeatedly used, and the problem of waste of the U-shaped structure section of the cleaning cloth tape 4 almost does not need to be considered.

Claims

1. A dispensing needle wiping and cleaning device, comprising a feeding tray, a receiving tray, a guide pulley group, a cleaning cloth belt, and a tensioning mechanism, wherein the cleaning cloth belt is output from the feeding tray, passes through the guide pulley group, and winds onto the receiving tray, characterized in that it further comprises... include: The cloth clamping device includes a pair of clamping blocks that can move closer to each other, and each of the two clamping blocks has a through groove extending along its translational direction in the middle, through which the cleaning cloth strip passes vertically in sequence. The hook device is located between two clamping blocks. The hook device includes movable hooks on both sides of the cleaning cloth and a reciprocating drive mechanism that drives the movable hooks to reciprocate within the gap between the two clamping blocks. When the hook device moves to the front or back side of the cleaning cloth, the cleaning cloth forms a U-shaped structure between the two clamping blocks. The U-shaped structure of the cleaning cloth is used to insert the glue dispensing needle to be wiped.

2. The dispensing needle wiping and cleaning device according to claim 1, characterized in that, The guide pulley assembly includes a double pulley structure for clamping the cleaning cloth belt, which is located on one side of the clamping device. The clamping device is located above a swing mechanism, which can drive the clamping device to swing towards the opposite side of the front or back of the cleaning cloth belt. When the clamping device is driven by the swing mechanism to swing to the front side of the cleaning cloth belt, the hooking device moves to the back side of the cleaning cloth. When the clamping device is swung to the back side of the cleaning cloth belt, the hooking device moves to the front side of the cleaning cloth.

3. The dispensing needle wiping and cleaning device according to claim 1, characterized in that, The fabric clamping device includes a base, two clamping blocks slidably connected to the base, and a groove between the two clamping blocks. The reciprocating drive mechanism includes a sliding seat and a rodless cylinder. The sliding seat and the rodless cylinder are disposed in the groove. The rodless cylinder drives the sliding seat to slide back and forth along the groove below the cleaning cloth belt. A pair of rotatable movable hooks are provided at each end of the sliding seat.

4. The dispensing needle wiping and cleaning device according to claim 3, characterized in that, The movable claw is equipped with a reset torsion spring that returns it to a horizontal position with the claw tip facing outward. Each end of the slide groove has a top block. The outer edge of the movable claw facing the end of the slide groove has a beveled structure. The inner edge of the movable claw facing away from the end of the slide groove has a limiting notch. The middle of the sliding seat has an elastic and resettable limiting fastener. When the movable claw rotates to a vertically upward position, the limiting fastener and the limiting notch engage.

5. The dispensing needle wiping and cleaning device according to claim 4, characterized in that, On both sides of the sliding seat, a limiting fastener is provided between two movable claws on the same side. The limiting fastener includes a U-shaped part and a pair of fastener ends symmetrically arranged at both ends of the U-shaped part. A horizontal sliding telescopic rod is provided on the inner side of the U-shaped part. The sliding telescopic rod is connected to the sliding seat. A top rod is provided below the clamping block at the height position corresponding to the U-shaped part.

6. The dispensing needle wiping and cleaning device according to claim 5, characterized in that, The clamping block has a recessed step at the lower edge of its inner side. The push rod is located at the step of the clamping block and is slidably connected to the clamping block. The end of the push rod has a boss, and a spring is sleeved on the inside of the boss.

7. The dispensing needle wiping and cleaning device according to claim 1, characterized in that, The fabric clamping device includes a pneumatic finger cylinder and two clamping blocks respectively connected to the finger part of the pneumatic finger cylinder.

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