A cleaning tool clamp

Abstract

The utility model discloses a kind of cleaning tool clamps, belong to clamp technical field, including installation base plate, multiple positioning members for positioning workpiece are provided on the installation base plate, multiple lock clamps are provided on the installation base plate, at least one workpiece is compressed by the lock clamp simultaneously, the abutting side of the installation base plate and the both sides of conveying line guide plate is provided with roller assembly. Thus, it can be through mechanical automatic lock structure, low-friction conveying assembly, the collaborative scheme of flexible compression design, realize: robot / smart screwdriver automatic lock, conveying friction≤1N, runout rate≤1%, workpiece indentation rate≤0.5%, vibration does not loosen, replace positioning member within 30 minutes to adapt different workpieces, maintenance cost reduces 60%.

Description

Technical Field

[0001] This utility model relates to a cleaning fixture, belonging to the field of fixture technology. Background Technology

[0002] A fixture is a device used in mechanical manufacturing to fix a workpiece in the correct position for processing or inspection; it is also called a clamp. In a broader sense, any device used to quickly, conveniently, and safely install a workpiece at any stage of a manufacturing process can be called a fixture. In industrial cleaning processes, tooling fixtures must meet three core requirements: high-pressure cleaning resistance, no electrical interference, and accurate workpiece positioning. Existing technologies have the following prominent defects, restricting the reliability of automated production and cleaning:

[0003] Mainstream cleaning fixtures use manual elbow clamps to fix workpieces, with a single workpiece fixing time of ≥30 seconds and an average hourly processing capacity of ≤120 pieces per person; they also cannot be adapted to automatic locking by robots / intelligent equipment, and the prohibition of electrical components in cleaning scenarios leads to bottlenecks in the introduction of automated production lines.

[0004] Existing fixtures and conveyor line guide plates mostly have rigid contact, with friction force ≥5N. During conveying, they are prone to deviation due to uneven force and are easy to jam.

[0005] Traditional clamps use metal bolts to directly clamp the workpiece, resulting in hard contact and an indentation rate of ≥8% on the workpiece surface. In addition, they mostly use ordinary lead screws without a self-locking structure. High-pressure cleaning and high-frequency vibration can easily cause the lead screw to loosen, resulting in workpiece displacement and affecting the cleaning effect.

[0006] The aforementioned problems make it difficult for existing fixtures to meet the cleaning requirements of high efficiency, automation, high reliability, and low damage. There is an urgent need for an innovative solution that is free of electrical components, automatically locks, allows for smooth transport, and protects the workpiece. Summary of the Invention

[0007] To solve the above-mentioned technical problems, this utility model provides a cleaning tooling fixture. Through the collaborative solution of automatic mechanical locking structure, low-friction conveying components, and flexible clamping design, it achieves: automatic locking by robot / intelligent screwdriver, conveying friction ≤1N, deviation rate ≤1%, workpiece indentation rate ≤0.5%, no loosening under vibration, replacement of positioning parts within 30 minutes to adapt to different workpieces, and a 60% reduction in maintenance costs.

[0008] The technical solution adopted by this utility model to solve its technical problem is:

[0009] A cleaning fixture includes a mounting base plate with multiple sets of positioning elements for positioning workpieces and multiple sets of locking clamps for simultaneously clamping at least one workpiece. Roller assemblies are provided on the abutting sides of the mounting base plate and the guide plates on both sides of the conveyor line. Each locking clamp includes a base with a nut at the top of its inner wall. A trapezoidal lead screw is threaded onto the nut. The upper portion of the trapezoidal lead screw extends above the base and is rotatably connected to a hinge seat via an angular contact bearing. The hinge seat is rotatably connected to a connecting plate via a rotating shaft. A mounting plate is provided at the end of the connecting plate, and at least one polyurethane bolt is provided on the mounting plate.

[0010] Preferably, the positioning element includes a plurality of supports for supporting the workpiece and a plurality of positioning pins, the positioning pins being inserted into slots on the workpiece.

[0011] Preferably, the roller assembly includes a cover plate, the cover plate being connected to a bearing via a support, the outer ring of the bearing extending out of a mounting base plate.

[0012] Preferably, washers are provided on both the upper and lower sides of the bearing to prevent the cover plate and mounting base plate from contacting the outer ring of the bearing.

[0013] Preferably, the base has a U-shaped structure, the top of the trapezoidal lead screw passes through the hinge seat and is connected to a hexagonal screwdriver bit, and an O-ring is provided between the hexagonal screwdriver bit and the hinge seat.

[0014] Preferably, a connecting rod is provided in the middle of the bottom of the connecting plate, and the bottom of the connecting rod is rotatably connected to the top of the base by a hinge pin.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] Without the need for electrical components, automatic clamping / unclamping is achieved through robots or smart screwdrivers, reducing the single workpiece fixing time from 30 seconds to 10 seconds and increasing hourly throughput by 200%, meeting the needs of large-scale production.

[0017] When there is no automated equipment, the hexagonal screwdriver bit can be manually rotated with a wrench to lock it in place, which is compatible with traditional production lines and has strong versatility.

[0018] The bearings of the roller assembly reduce the conveying friction from 5N to below 1N, the deviation rate from 15% to 0.8%, and the jamming rate to near 0.

[0019] Polyurethane bolts can buffer compression when in contact with workpieces, reducing the indentation rate from 8.5% to 0.3%, making them particularly suitable for soft workpieces such as aluminum alloys and plastics.

[0020] With a self-locking angle of 15° and a set torque of 5 N·m, the trapezoidal lead screw remains unloose under high-pressure cleaning vibration of 5 MPa, and the workpiece displacement rate is 0%, ensuring that there are no blind spots in the cleaning process.

[0021] With a fully mechanical structure, it can withstand high-pressure water of 5MPa, so there is no need to worry about short circuits or component damage. It is suitable for various cleaning scenarios such as spraying, soaking, and ultrasonic cleaning. Attached Figure Description

[0022] 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 the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 This is a schematic diagram of the roller assembly of this utility model;

[0025] Figure 3 This is a schematic diagram of the locking clamp of this utility model;

[0026] Figure 4 This is a schematic diagram of the hinge seat of this utility model.

[0027] In the diagram: 1. Mounting base plate; 2. Handle; 3. Support column; 4. Locating pin; 5. Roller assembly; 501. Cover plate; 502. Bearing; 503. Washer; 504. Support column; 6. Locking clamp; 601. Base; 602. Nut; 603. Trapezoidal lead screw; 604. Connecting rod; 605. Hinge pin; 606. Hinge seat; 607. Angular contact bearing; 608. Cover plate; 609. Hexagonal screwdriver bit; 610. O-ring; 611. Connecting plate; 612. Mounting plate; 613. Polyurethane bolt. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Please see Figures 1-4 This utility model provides a technical solution:

[0030] like Figure 1 , Figure 3 and Figure 4 As shown, a cleaning fixture includes a mounting base plate 1, which is integrally formed from Q235 cold-rolled steel plate and coated with 80μm thick anti-rust paint, with a salt spray resistance of ≥48 hours. The mounting base plate 1 is provided with multiple sets of positioning components for positioning workpieces, and multiple sets of locking clamps 6 are provided on the mounting base plate 1. At least one workpiece is simultaneously clamped by the locking clamps 6. Roller assemblies 5 are provided on the abutting sides of the mounting base plate 1 and the guide plates on both sides of the conveyor line. The device 6 includes a base 601, and a nut 602 is provided on the top of the inner wall of the base 601. A trapezoidal lead screw 603 is threaded onto the nut 602. The upper part of the trapezoidal lead screw 603 extends above the base 601 and is rotatably connected to a hinge seat 606 through an angular contact bearing 607. The hinge seat 606 is rotatably connected to a connecting plate 611 through a rotating shaft. An mounting plate 612 is provided at the end of the connecting plate 611. At least one polyurethane bolt 613 is provided on the mounting plate 612.

[0031] Furthermore, M8 threaded holes with a depth of 15mm are opened on both sides of the mounting base plate 1 for fixing the handle 2. The handle 2 is made of 304 stainless steel round tube with a diameter of 20mm and a wall thickness of 2mm. It is fixed to both sides of the mounting base plate 1 with M8 countersunk screws at a height of 100mm to facilitate manual handling of the clamp. The surface of the handle 2 is brushed to prevent slippage.

[0032] like Figure 1 As shown, the positioning component includes multiple support columns 3 for supporting the workpiece and multiple positioning pins 4. The positioning pins 4 are inserted into the holes and slots on the workpiece. Specifically, the support columns 3 are made of nylon 66 material, resistant to high-pressure water erosion, cylindrical in shape, 20mm in height, and have M6 external threads at the bottom. They are fixed to the mounting base plate 1 by the threads. Four support columns 3 form a group to support the bottom of the workpiece and prevent the workpiece from directly contacting the base plate, thus avoiding blind spots during cleaning. The positioning pins 4 are made of 45 steel with heat treatment, 8mm diameter with a tolerance of H7, 30mm in length, and 20mm protruding from the base plate. They are clearance-fitted with the holes and slots on the workpiece. Each group of positioning components is equipped with two positioning pins to limit the X / Y displacement of the workpiece, with a positioning accuracy of ±0.05mm.

[0033] like Figure 2 As shown, the roller assembly 5 includes a cover plate 501, and the cover plate 501 is connected to a bearing 502 via a support column 504. The outer ring of the bearing 502 extends out of the mounting base plate 1.

[0034] Furthermore, washers 503 are provided on both the upper and lower sides of the bearing 502. The washers 503 are used to prevent the cover plate 501 and the mounting base plate 1 from contacting the outer ring of the bearing 502.

[0035] In this embodiment, the cover plate 501 is injection molded from ABS engineering plastic, with a bearing mounting hole in the middle, and is fixed to the mounting base plate 1 by M4 screws. The bearing 502 is a deep groove ball bearing with an outer diameter of 40mm, a width of 12mm, and the outer ring extending 15mm out of the mounting base plate, directly contacting the conveyor guide plate. The rolling friction coefficient is ≤0.01. The washer 503 is made of polytetrafluoroethylene with a friction coefficient of 0.04 and a thickness of 2mm. It is fitted onto the support column 504, located on the upper and lower sides of the bearing 502, raising the inner ring of the bearing 502 to prevent the outer ring of the bearing 502 from rubbing against the cover plate 501 or the mounting base plate 1. The support column 504 is made of stainless steel, with one end threaded to the cover plate 501 and the other end passing through the inner ring of the bearing 502 and threaded to the mounting base plate 1. The preload torque is 1.5 N·m to ensure smooth and uninterrupted bearing rotation.

[0036] like Figure 3 As shown, the base 601 has a U-shaped structure. The top end of the trapezoidal lead screw 603 passes through the hinge seat 606 and is connected to a hexagonal screwdriver bit 609. An O-ring 610 is provided between the hexagonal screwdriver bit 609 and the hinge seat 606 to prevent cleaning water from seeping into the hinge seat 606 and affecting the rotation of the bearing.

[0037] Furthermore, a connecting rod 604 is provided in the middle of the bottom of the connecting plate 611, and the bottom of the connecting rod 604 is rotatably connected to the top of the base 601 by a hinge pin 605.

[0038] It should be noted that the base 601 is a U-shaped structure formed by die casting of ADC12 aluminum alloy. Four M6 mounting holes are opened at the bottom, and it is fixed to the mounting base plate 1 with screws. The top of the inner wall is fitted with a nut 602. The nut 602 is made of H62 brass, with a trapezoidal thread T20×4 with a lead of 4mm and a self-locking angle of 15° to ensure that the lead screw is self-locking when there is no external force. It is fitted into the top of the base 601 with an interference fit and is machined as a whole with the base to ensure coaxiality. The trapezoidal lead screw 603 is made of 45 steel, heat treated and chrome plated. One end is machined with an external thread to fit with the nut 602, and the other end is connected to the hinge seat 606 through the angular contact bearing 607. The top end passes through the hinge seat 606 and is fixed with a hexagonal screwdriver bit 609 with screws. Both are fitted with positioning pins to prevent rotation.

[0039] The angular contact bearing 607, model 7203C, is installed in the bearing hole of the hinge seat 606. A cover plate 608, made of ABS material and 3mm thick, is installed on the outside to prevent cleaning water from entering the bearing. The hinge seat 606 is connected to the connecting plate 611 via a pivot shaft, allowing it to rotate ±30° around the pivot shaft. The connecting plate 611 is made of Q235 steel plate, with one end hinged to the hinge seat 606 and the other end welded to a mounting plate 612. A connecting rod 604, made of stainless steel, is connected to the bottom center via a hinge pin 605. The bottom of the connecting rod 604 is hinged to the top of the base 601 via the hinge pin 605, forming a linkage mechanism that ensures the connecting plate is pressed down when the trapezoidal lead screw rises.

[0040] Mounting plate 612 is made of 304 stainless steel plate. In this embodiment, two M10 threaded holes with a spacing of 20mm are opened on the surface of mounting plate 612 for installing polyurethane bolts 613.

[0041] The 613 polyurethane bolt is made of polyurethane with a Shore hardness of 70HA. It has a diameter of 12mm, a length of 25mm, and a hemispherical head that can buffer pressure when in contact with the workpiece. The maximum compression is 5mm, which avoids damage to the workpiece due to hard contact. The bolt tail has an M10 external thread, and the extension length can be adjusted by rotation to adapt to workpieces of different thicknesses.

[0042] The workflow of this embodiment is as follows:

[0043] The robot places the workpiece to be cleaned, such as a car sensor housing, on the support column 3. The positioning pin 4 is inserted into the workpiece positioning hole to limit X / Y displacement. The intelligent screwdriver with PH2 bit sleeve moves down and engages the hexagonal bit 609. It rotates clockwise, and the trapezoidal screw 603 rises along the nut 602. Through the hinge seat 606, it drives the connecting plate 611 to press down around the hinge pin 605. The polyurethane bolt 613 contacts the workpiece surface. It continues to rotate until the set torque of 5 N·m is reached. The screwdriver stops locking, and the fixture moves with the conveyor line. The bearing 502 of the roller assembly 5 rolls along the guide plate with a friction of ≤1 N, without deviation. It enters the high-pressure cleaner with a pressure of 5 MPa and a water temperature of 60℃. The O-ring 610 prevents water seepage. There are no electrical components, so there is no need to worry about short circuits. After cleaning, the intelligent screwdriver rotates the hexagonal bit 609 counterclockwise, the trapezoidal screw 603 descends, the connecting plate 611 rises, the polyurethane bolt 613 disengages from the workpiece, the robot removes the workpiece, and the fixture returns to the loading position for recycling.

[0044] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cleaning fixture, comprising a mounting base plate (1), characterized in that, The mounting base plate (1) is provided with multiple sets of positioning components for positioning workpieces. The mounting base plate (1) is provided with multiple sets of locking clamps (6). At least one workpiece is pressed at the same time by the locking clamps (6). Roller assemblies (5) are provided on the opposing sides of the mounting base plate (1) and the guide plates on both sides of the conveyor line. The locking clamp (6) includes a base (601), a nut (602) is provided on the top of the inner wall of the base (601), a trapezoidal screw (603) is threaded onto the nut (602), the upper part of the trapezoidal screw (603) extends to the top of the base (601) and is rotatably connected to a hinge seat (606) through an angular contact bearing (607), the hinge seat (606) is rotatably connected to a connecting plate (611) through a rotating shaft, an mounting plate (612) is provided at the end of the connecting plate (611), and at least one polyurethane bolt (613) is provided on the mounting plate (612).

2. The cleaning fixture according to claim 1, characterized in that, The positioning element includes multiple support pillars (3) for supporting the workpiece and multiple positioning pins (4), which are inserted into the slots on the workpiece.

3. The cleaning fixture according to claim 1, characterized in that, The roller assembly (5) includes a cover plate (501) to which a bearing (502) is connected via a support (504), the outer ring of which extends out of a mounting base plate (1).

4. A cleaning fixture according to claim 3, characterized in that, Washers (503) are provided on both the upper and lower sides of the bearing (502). The washers (503) are used to prevent the cover plate (501) and the mounting base plate (1) from contacting the outer ring of the bearing (502).

5. A cleaning fixture according to claim 1, characterized in that, The base (601) has a U-shaped structure. The top end of the trapezoidal lead screw (603) passes through the hinge seat (606) and is connected to a hexagonal screwdriver bit (609). An O-ring (610) is provided between the hexagonal screwdriver bit (609) and the hinge seat (606).

6. A cleaning fixture according to claim 1, characterized in that, A connecting rod (604) is provided in the middle of the bottom of the connecting plate (611), and the bottom of the connecting rod (604) is rotatably connected to the top of the base (601) by a hinge pin (605).

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