Electrode protection box on welding arm and electrode arm for resistance welding robot

Abstract

The present invention discloses an electrode protection box for the welding arm and electrode arm of a resistance welding robot; the technical problem to be solved is: the technical problem that the electrode arm of the electrode protection box in the prior art mentioned in the background technology is small in diameter, low in strength, and the O-ring is easily damaged. The adopted technical solution is: an electrode protection box for the welding arm and electrode arm of a resistance welding robot, comprising an electrode protection box body, a groove is concavely arranged on the end surface of one end of the electrode protection box body, a water inlet channel and a water outlet channel are arranged on the electrode protection box body, and a water inlet connector and a water outlet connector are respectively installed on the outer surface of the electrode protection box body at the inlet and the outlet. Advantages: by adopting this electrode protection box, the diameter of the electrode arm of the resistance welding robot can be made thicker, the strength is increased, and the O-ring is prevented from being damaged during the installation process. The left and right sides can be used interchangeably, and the parts are much shorter than before, saving material and processing costs.

Description

Technical Field

[0001] The invention relates to an electrode protection box on a welding arm and an electrode arm of a resistance welding robot. Background Art

[0002] The protection box is used in the welding gun of the resistance welding robot. Resistance welding uses a transformer to reduce the voltage and increase the current, making the instantaneous short-circuit current larger. The heat generated instantly melts the plates to be welded and then bonds them together. Since a large current is required, the conductivity between the conductor loops must be high. Copper was generally used before. After welding, the electrode arm needs to be cooled quickly. If the cooling is not good, the electrode will become hot, deform easily, and lose quickly. The front electrode arm of the resistance welding robot will be cooled by water if space permits to reduce losses.

[0003] Since the efficiency requirements of resistance welding robots are very high now, the weight of welding guns needs to be lighter and lighter. Many manufacturers use aluminum alloy welding arms as the form of welding arms. However, due to the characteristics of aluminum, it is easy to electrolyze when it is energized with water, causing hidden dangers. In order to lock the welding arm and the electrode arm, an electrode protection box is used for connection. Generally, a 3mm to 4mm groove is opened on the electrode protection box. Because the groove is relatively sharp, the internal water-proof O-ring is easily damaged during installation. Because aluminum cannot be directly energized and water-transmitted, the general practice is to put the electrode arm in the electrode protection box, and let the inlet and outlet water go through the electrode protection box to avoid the aluminum arm working when it is energized and water-transmitted.

[0004] like Figure 1 As shown. Because aluminum is easy to electrolyze when it is powered by water, an electrode box is usually installed when using an aluminum arm. In this way, the water-passing part of the electrode can be connected out, so that the electrode arm will be thinner and the strength will be reduced. In addition, the processing of the electrode protection box consumes materials and takes time, and the processing cost is high. In addition, since the parts A, B, and C have sharp corners when cutting the grooves, the O-rings on the matching electrode arms will be damaged during assembly, causing water leakage. The IN and OUT water inlet and outlet parts are round, with tapped threads and many burrs. When installing the copper joint, the sealant on the copper joint will be scraped off, resulting in poor sealing and water leakage. Generally, the grooved part overlaps with the welding arm and is divided into left and right. If it is not divided into left and right, 4 holes need to be processed, which increases the cost. The electrode protection box has no positioning holes and is easy to move when replacing the electrode. Summary of the invention

[0005] The technical problem to be solved by the present invention is: to address the technical problems that the electrode arm of the electrode protection box in the prior art mentioned in the background technology has a small diameter, low strength, and the O-ring is easily damaged.

[0006] The present invention overcomes the shortcomings of the prior art and provides an electrode protection box for the welding arm and electrode arm of a resistance welding robot. The electrode protection box is obtained by removing the front end groove part of the electrode box in the prior art and leaving only the rear end part. The problem of O-ring damage can be effectively avoided, so that the diameter of the front end electrode arm can be thicker, thereby increasing the strength, increasing the performance of the product, and saving materials and processing costs. At the same time, two positioning pin holes are added to the electrode sleeve. For the same product, it is only necessary to adjust the direction of the positioning pin holes during installation, and there is no need to make them into symmetrical parts. The product can be positioned as a whole with the welding arm, which is more convenient and will not loosen when the electrode is replaced. The technical problem that the electrode protection box in the prior art has no positioning holes and is easy to move when the electrode is replaced is effectively solved.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] An electrode protection box for a welding arm and an electrode arm of a resistance welding robot comprises a welding arm and an electrode arm; a cooling channel is arranged in the electrode arm, a cooling water pipe is arranged in the cooling channel, and a cooling water outlet gap is left between the cooling water pipe and the inner wall of the cooling channel; it is characterized in that it also comprises an electrode protection box body, a groove is arranged inwardly on the end surface of one end of the electrode protection box body, one end of the electrode arm is inserted into the groove, and an O-type sealing ring is arranged between the outer surface of the electrode arm and the groove wall of the groove; a water inlet channel and a water outlet channel are arranged on the electrode protection box body, the inlet of the water inlet channel is located on the outer surface of the electrode protection box body, and the outer surface of the electrode protection box body is milled into a plane at the inlet; the outlet of the water outlet channel is located on the outer surface of the electrode protection box body, and the outer surface of the electrode protection box body is milled into a plane at the outlet; a water inlet joint and a water outlet joint are respectively installed on the outer surface of the electrode protection box body at the inlet and the outlet; the outlet of the water inlet channel is connected to the cooling water pipe, and the inlet of the water outlet channel is connected to the cooling water outlet gap;

[0009] The electrode protection box body as a whole and together with a section of the electrode arm are inserted into the free end of the welding arm and are clamped by bolts on the welding arm. The electrode protection box body and the welding arm are fixed by positioning pins.

[0010] As an improvement to the technical solution of the present invention, an O-ring sealing groove for installing an O-ring for circumferential sealing is provided on the outer surface of the electrode arm located in the groove.

[0011] In an improvement to the technical solution of the present invention, the cooling water pipe is connected to the outlet of the water inlet channel by a threaded pair. The design purpose of this technical feature is that the threaded pair connection can prevent water from overflowing to the greatest extent, so that water can enter the cooling water pipe 100% to cool the electrode arm.

[0012] The improvement of the technical solution of the present invention is that two positioning pin holes are symmetrically arranged on the outer surface of the electrode protection box body. The design of two positioning pin holes is the same product. It only needs to adjust the direction of the positioning pin holes during installation. It does not need to be made into symmetrical parts. It can be positioned as one with the welding arm, which is more convenient and will not loosen when replacing the electrode.

[0013] An improvement on the technical solution of the present invention is that a sealing ring is provided at the contact point between the water inlet joint and the outer surface of the electrode protection box body, and a sealing ring is provided at the contact point between the water outlet joint and the outer surface of the electrode protection box body.

[0014] In an improvement to the technical solution of the present invention, the cooling water pipe is a Teflon pipe. The Teflon pipe is a conventional technical product in the prior art and can be directly purchased.

[0015] The resistance welding robot in the technical solution of the present invention is a conventional technical product in the prior art and can be directly purchased.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The electrode protection box on the welding arm and electrode arm of the resistance welding robot of the present invention removes the front end groove part of the existing electrode box and only leaves the rear end part, which can effectively avoid the problem of O-ring damage. In this way, the diameter of the front end electrode arm can be thicker, thereby increasing the strength, improving the performance of the product, and saving materials and processing costs.

[0018] 2. The electrode protection box on the welding arm and electrode arm of the resistance welding robot of the present invention can make the diameter of the electrode arm thicker to increase the strength and prevent the O-ring from being damaged during the installation process. The left and right sides can be used universally, and the parts are much shorter than before, saving material and processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a cross-sectional view of an existing electrode protection box.

[0020] Figure 2 It is a schematic diagram of the electrode protection box of the present application.

[0021] Figure 3 It is a cross-sectional view of the electrode protection box of the present application.

[0022] Figure 4 It is a schematic diagram of the electrode arm of the resistance welding robot.

[0023] Figure 5 It is a schematic diagram of the installation of the electrode protection box and the electrode arm of the present application.

[0024] Figure 6 It is a schematic diagram of the installation of the electrode protection box, electrode arm and welding arm of the present application.

[0025] Figure 7 It is a cross-sectional view of the installation schematic diagram of the electrode protection box, electrode arm and welding arm of the present application. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is described in detail below, but the protection scope of the present invention is not limited to the embodiments.

[0027] To make the content of the present invention more clearly understood, the following Figure 1-7 The specific implementation manner is further described.

[0028] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0029] Example:

[0030] The resistance welding robot includes a welding arm 6 and an electrode arm 2; a cooling channel is arranged in the electrode arm 2, a cooling water pipe 3 is arranged in the cooling channel, and a cooling water outlet gap is left between the cooling water pipe 3 and the inner wall of the cooling channel. The cooling water pipe 3 is a Teflon tube. The Teflon tube is a conventional technical product in the prior art and can be directly purchased.

[0031] like Figure 2 , 4 As shown in Figure 5, the electrode protection box on the welding arm and electrode arm of the resistance welding robot includes an electrode protection box body 1, a groove 1-1 is concavely arranged on the end surface of one end of the electrode protection box body 1, one end of the electrode arm 2 is inserted into the groove 1-1 and an O-ring is arranged between the outer surface of the electrode arm 2 and the groove wall of the groove 1-1; specifically, an O-ring sealing groove 2-1 for installing an O-ring for circumferential sealing is concavely arranged on the outer surface of the electrode arm 2 located in the groove 1-1.

[0032] like Figure 2 , 3As shown in Figure 5, an inlet channel 1-2 and an outlet channel 1-3 are provided on the electrode protection box body 1. The inlet of the inlet channel 1-2 is located on the outer surface of the electrode protection box body 1, and the outer surface of the electrode protection box body 1 is milled into a plane at the inlet; the outlet of the outlet channel 1-3 is located on the outer surface of the electrode protection box body 1, and the outer surface of the electrode protection box body 1 is milled into a plane at the outlet; the inlet joint 4 and the outlet joint 5 are respectively installed on the outer surface of the electrode protection box body 1 at the inlet and outlet; a sealing ring is provided at the contact point between the inlet joint 4 and the outer surface of the electrode protection box body 1, and a sealing ring is provided at the contact point between the outlet joint 5 and the outer surface of the electrode protection box body 1. The outlet of the inlet channel 1-2 is connected to the cooling water pipe 3, and the cooling water pipe 3 is connected to the outlet end of the inlet channel 1-2 by a threaded pair; the threaded pair connection can prevent water from overflowing to the maximum extent, so that water can enter the cooling water pipe 100% to cool the electrode arm. The inlet of the outlet channel 1-3 is connected to the cooling water outlet gap. The electrode protection box body 1 is inserted into the free end of the welding arm 6 together with a section of the electrode arm 2, and is clamped by the bolt 7 on the welding arm 6. Figure 6 and 7 As shown. The specific structure is that the free end of the welding arm 6 is provided with an axial opening, and two clamping bolts 7 are provided at the front end of the welding arm 6. When the electrode protection box body 1 is inserted into the free end of the welding arm 6 together with a section of the electrode arm 2 as a whole, the tightening bolts 7 are clamped through the opening. The electrode protection box body 1 and the welding arm 6 are fixed by positioning pins, specifically, two positioning pin holes 1-4 are symmetrically provided on the outer surface of the electrode protection box body 1. The design of two positioning pin holes, the same product, only needs to adjust the direction of the positioning pin holes during installation, and does not need to be made into a symmetrical part. It can be positioned as a whole with the welding arm, which is more convenient and will not loosen when replacing the electrode.

[0033] By adopting the electrode protection box, the diameter of the electrode arm of the resistance welding robot can be made thicker, which increases the strength and prevents the O-ring from being damaged during the installation process. The left and right sides can be used universally, and the parts are much shorter than before, saving material and processing costs.

[0034] The electrode protection box is shortened, and flange joints with O-rings are provided on both sides of the electrode protection box to introduce and lead out water.

[0035] The parts not involved in the present invention are the same as the prior art or can be implemented by using the prior art.

[0036] As described above, although the present invention has been shown and described with reference to specific preferred embodiments, it should not be construed as limiting the present invention itself. Various changes in form and details may be made without departing from the spirit and scope of the present invention as defined in the appended claims.

Claims

1. An electrode protection box for a welding arm and an electrode arm of a resistance welding robot, comprising a welding arm (6) and an electrode arm (2); a cooling channel is arranged in the electrode arm (2), a cooling water pipe (3) is arranged in the cooling channel, and a cooling water outlet gap is left between the cooling water pipe (3) and the inner wall of the cooling channel; characterized in that: It also comprises an electrode protection box body (1), a groove (1-1) is provided inwardly on the end surface of one end of the electrode protection box body (1), one end of the electrode arm (2) is inserted into the groove (1-1), and an O-type sealing ring is provided between the outer surface of the electrode arm (2) and the groove wall of the groove (1-1); a water inlet channel (1-2) and a water outlet channel (1-3) are provided on the electrode protection box body (1), the inlet of the water inlet channel (1-2) is located on the outer surface of the electrode protection box body (1), and the outer surface of the electrode protection box body (1) is milled into a plane at the inlet; the outlet of the water outlet channel (1-3) is located on the outer surface of the electrode protection box body (1), and the outer surface of the electrode protection box body (1) is milled into a plane at the outlet; a water inlet joint (4) and a water outlet joint (5) are respectively installed on the outer surface of the electrode protection box body (1) at the inlet and the outlet; the outlet of the water inlet channel (1-2) is connected to the cooling water pipe (3), and the inlet of the water outlet channel (1-3) is connected to the cooling water outlet gap; The electrode protection box body (1) is inserted as a whole together with a section of the electrode arm (2) into the free end of the welding arm (6) and is clamped by bolts on the welding arm (6); the electrode protection box body (1) and the welding arm (6) are fixed by positioning pins; An O-ring sealing groove for mounting an O-ring for circumferential sealing is provided on the outer surface of the electrode arm (2) located in the groove (1-1); Two positioning pin holes (1-4) are symmetrically arranged on the outer surface of the electrode protection box body (1).

2. The electrode protection box for the welding arm and electrode arm of a resistance welding robot as claimed in claim 1, characterized in that: The cooling water pipe (3) is connected to the outlet end of the water inlet channel (1-2) via a threaded pair.

3. The electrode protection box for the welding arm and electrode arm of the resistance welding robot according to claim 1, characterized in that: A sealing ring is provided at a contact point between the water inlet joint (4) and the outer surface of the electrode protection box body (1), and a sealing ring is provided at a contact point between the water outlet joint (5) and the outer surface of the electrode protection box body (1).

4. The electrode protection box for the welding arm and electrode arm of a resistance welding robot as claimed in claim 1, characterized in that: The cooling water pipe (3) is a Teflon tube.

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