Special welding clamp for tubular sintering furnace

Abstract

The invention provides a clamp special for welding of a tubular sintering furnace. The clamp comprises a base, a spring, a cover plate, a V-shaped block, a sliding block, a sliding block fixing plate, an eccentric wheel, a gear shaft, a bearing, a gear rack, a bolt, a nut fixing plate and the like. The edge of the base is designed to be a fillet with the same size as an inner cavity of the tubular sintering furnace so that the base can be fixed in the tubular sintering furnace conveniently, and the tail end is connected with a supporting block. All the mechanisms are connected to the base through screws. One end of the welding sample is connected with the supporting block, and the other end of the welding sample is in contact with the transmission structure. By changing the feeding amount of the bolt, the pressure stress borne by the welding sample is changed through the transmission structure. The special miniature welding clamp suitable for the tubular sintering furnace is designed, large pressure stress is provided for a sample in a high-temperature welding experiment, and the defect that the pressure stress cannot be changed due to the narrow space of the tubular sintering furnace in the prior art is overcome; therefore, the clamp has certain scientific and engineering significance, and the clamp is wide in application prospect, simple in device, compact in structure, reliable in work and long in service life.

Description

Technical Field

[0001] The invention relates to the field of welding and is a clamp suitable for a novel solder research process. Background Art

[0002] Welding is the most common method of connecting two or more metal parts into one component, and it has gradually become the most economical and effective method of permanent metal connection. According to statistics, more than 50% of the gross national product of the United States has a direct or indirect relationship with welding. Welding can not only improve the connection strength, but also provide conductivity. However, the quality of welding is closely related to factors such as working temperature, pressure, and flux, so it is of great significance to design a welding clamp suitable for high temperature conditions. Commonly used clamps are generally large in size and cannot accurately measure the clamping force. Due to size limitations, they cannot be used in tubular sintering furnaces. The tubular sintering furnace is a small experimental sintering furnace that works under vacuum conditions and has a maximum working temperature of 1200°C, but the working chamber is a tubular chamber with a diameter of 80mm×400mm. When studying welding performance, the specimen and solder are usually placed in a tubular sintering furnace for welding; however, during the welding process, due to factors such as pressure and alignment between the specimen and the solder, the welding quality will be poor. Traditional clamps cannot currently reasonably solve this problem, and they are large in size and have poor stability. Summary of the invention

[0003] In view of the above problems, the present invention proposes a special fixture for welding a tubular sintering furnace, which provides a large compressive stress to the sample in a welding experiment under high temperature conditions, making up for the situation in the past where the compressive stress could not be changed due to the narrow space of the tubular sintering furnace.

[0004] In order to solve the above problems, the technical solution adopted by the present invention is:

[0005] A special fixture for welding a tubular sintering furnace, comprising a base (1), a spring (2), a cover plate (3), a sample (4), solder (5), a V-block (6), a slider (7), a slider fixing plate (8), an eccentric wheel (12), a bevel gear (13), a bearing (10), a rack (14), a bolt (16), and a nut fixing plate (15). The fixture is characterized in that a groove is provided on the base, and the V-block (6) is embedded in the groove of the base (1) for fixing; the edge of the base (1) is designed to have a fillet with the same size as the inner cavity of the sintering furnace, so as to facilitate fixing in the tubular sintering furnace, and a support block is provided at the tail end; a circular groove is provided on the support block for supporting the spring (2); the other end of the spring (2) is connected to the sample (4) through the cover plate (3), and both are placed on the V-block (6), so that the circular sample is centered and can only move horizontally; the edge of the V-block (6) is printed with a coordinate scale for measuring the length of the spring (2); the other end of the sample is in contact with a transmission mechanism, and the transmission structure is driven by a thread. The invention is composed of a gear rack transmission and an eccentric wheel transmission structure; the threaded transmission structure is composed of a nut fixing plate (15) with a threaded hole and a bolt (16), and the fixing plate (15) is connected to the base by screws; the gear rack transmission structure is composed of a gear (13) and a rack (14) with the same meshing angle, module and helix angle, and the rack (14) is embedded in the groove of the base plate; the gear (13) is connected to the shaft by a key (17); the eccentric wheel transmission structure is composed of an eccentric wheel (12) and a slider (7), and the eccentric wheel is connected to the shaft by a key (17); the slider (7) is embedded in the groove of the base plate (1) and moves horizontally along the groove.

[0006] Preferably, the welding specimen is placed horizontally on the V-block (6) to play a centering role so that the clamping force is along the center line of the specimen;

[0007] Preferably, a special fixture for a tubular sintering furnace;

[0008] Preferably, the nut (15) is welded on the fixing plate, and the fixing plate is connected to the base by screws.

[0009] Preferably, the bevel gear (13) and the eccentric wheel (12) are connected to the shaft (11) via a key (17).

[0010] Preferably, a special clamp transmission mechanism for a tubular sintering furnace is composed of a threaded transmission, a gear rack transmission and an eccentric wheel transmission, and the clamping force at both ends of the sample (4) can be accurately controlled by adjusting the feed amount of the bolt (16);

[0011] Preferably, a special fixture for a tubular sintering furnace is used for positioning and clamping a cylindrical specimen with a diameter of 10 to 15 mm for welding tests, and the maximum load applied is 80 MPa;

[0012] The invention is entirely composed of mechanical structures and can work stably under high temperature and vacuum conditions.

[0013] The present invention has the following beneficial effects:

[0014] 1. The device of the present invention clamps and fixes the sample by the slider during the welding process, and adjusts the compressive stress on both ends of the sample by changing the feed amount of the bolt. Since the sample is placed on the V-block, the pressure on the sample is along the center line of the circular sample, avoiding the influence of bending moment generated by the non-centering structure during clamping.

[0015] 2. After the specimen is clamped, adjust the bolt feed amount to increase the compressive stress at both ends of the specimen, and obtain the clamping force efficiently and accurately through the spring compression.

[0016] 3. The high temperature welding fixture of the tubular sintering furnace is composed of a purely mechanical structure, including bolt drive, gear rack drive and eccentric wheel drive, which can work at high temperatures, and the fixture has a compact structure, reliable operation and long service life. Each structure has low cost and is easy to manufacture and replace. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the external structure of the device of the present invention;

[0018] Figure 2 It is a schematic diagram of the gear-shaft-eccentric wheel cross section;

[0019] Reference numerals:

[0020] 1-base plate, 2-spring, 3-cover plate, 4-sample, 5-solder, 6-V-block, 7-slider, 8-slider fixing plate, 9-support frame, 10-bearing, 11-shaft, 12-eccentric wheel, 13-helical gear, 14-helical rack, 15-fixing plate, 16-bolt, 17-flat key. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0022] like Figure 1As shown, the present invention designs a special welding fixture for a tubular sintering furnace, which is composed of a base (1), a spring (2), a cover plate (3), a sample (4), solder (5), a V-block (6), a slider (7), a slider fixing plate (8), an eccentric wheel (12), a bevel gear (13), a bearing (10), a rack (14), a bolt (16), and a nut fixing plate (15). The characteristics are that a groove is provided on the base, and the V-block (6) is embedded in the groove of the base (1) and fixed; the edge of the base (1) is designed to be rounded with the same size as the inner cavity of the sintering furnace, so as to facilitate fixation in the tubular sintering furnace, and a support block is provided at the tail end; a circular groove is provided on the support block for supporting the spring (2); the other end of the spring (2) is connected to the sample (4) through the cover plate (3), and both are placed on the V-block (6), so that the circular sample is centered and can only move horizontally; the edge of the V-block (6) is printed with a coordinate scale for measuring the length of the spring (2); the other end of the sample is in contact with the transmission mechanism, and the transmission structure is driven by a thread. The invention is composed of a gear rack transmission and an eccentric wheel transmission structure; the threaded transmission structure is composed of a nut fixing plate (15) with a threaded hole and a bolt (16), and the fixing plate (15) is connected to the base by screws; the gear rack transmission structure is composed of a gear (13) and a rack (14) with the same meshing angle, module and helix angle, and the rack (14) is embedded in the groove of the base plate; the gear (13) is connected to the shaft by a key (17); the eccentric wheel transmission structure is composed of an eccentric wheel (12) and a slider (7), and the eccentric wheel is connected to the shaft by a key (17); the slider (7) is embedded in the groove of the base plate (1) and moves horizontally along the groove.

[0023] Figure 2 In the transmission structure of the present invention, the bevel gear (13) and the eccentric wheel (12) are connected to the shaft (11) through a key (17). The shaft (11) is connected to the fixed plate through a bearing (10).

[0024] When in use, first determine the load to be applied in the welding experiment, calculate the corresponding compression amount of the spring (2) under the load, then place the welding sample on the V-block (6), adjust the slider (7) so that both ends of the sample (4) are in contact with the slider (7), record the initial length of the spring (2) through the scale on the V-block (6), and calculate the length under the working load. Finally, adjust the feed amount of the bolt (16), and increase the clamping force at both ends of the sample (4) to the working load through bolt transmission, gear rack transmission and eccentric wheel transmission.

[0025] Specifically, the present invention performs positioning and clamping for welding tests of cylindrical specimens with a diameter of 10 to 15 mm, and the maximum load applied is 80 MPa. In addition, the device is entirely composed of mechanical structures and can work stably under high temperature and vacuum conditions. The transmission mechanism is composed of threaded transmission, gear rack transmission and eccentric wheel transmission, and the clamping force at both ends of the specimen can be accurately controlled by adjusting the bolt feed amount.

Claims

1. A special welding fixture for a tubular sintering furnace, comprising a base (1), a spring (2), a cover plate (3), a sample (4), solder (5), a V-block (6), a slider (7), a slider fixing plate (8), an eccentric wheel (12), a bevel gear (13), a bearing (10), a rack (14), a bolt (16), and a nut fixing plate (15). The characteristics of the fixture are that a groove is provided on the base, and the V-block (6) is embedded in the groove of the base (1) and fixed; the edge of the base (1) is designed to have a fillet with the same size as the inner cavity of the sintering furnace, so as to facilitate fixation in the tubular sintering furnace, and a support block is provided at the tail end; a circular groove is provided on the support block for supporting the spring (2); the other end of the spring (2) is connected to the sample (4) through the cover plate (3), and both are placed on the V-block (6), so that the circular sample is centered and can only move horizontally; the edge of the V-block (6) is printed with a coordinate scale for measuring the length of the spring (2); the other end of the sample is in contact with the transmission mechanism, and the transmission structure is driven by a thread. The invention is composed of a gear rack transmission and an eccentric wheel transmission structure; the threaded transmission structure is composed of a nut fixing plate (15) with a threaded hole and a bolt (16), and the fixing plate (15) is connected to the base by screws; the gear rack transmission structure is composed of a gear (13) and a rack (14) with the same meshing angle, module and helix angle, and the rack (14) is embedded in the groove of the base plate; the gear (13) is connected to the shaft by a key (17); the eccentric wheel transmission structure is composed of an eccentric wheel (12) and a slider (7), and the eccentric wheel is connected to the shaft by a key (17); the slider (7) is embedded in the groove of the base plate (1) and moves horizontally along the groove.

2. The special welding fixture for a tubular sintering furnace according to claim 1, characterized in that: The welding specimen (4) is placed horizontally on a V-shaped block (6) to play a centering role so that the clamping force is along the center line of the specimen; The V-shaped block (6) is embedded in the groove of the bottom plate, and a ruler is provided on the V-shaped block (6) for measuring the length of the spring (2).

3. The special fixture for a tubular sintering furnace according to claim 1, characterized in that: The nut (15) is welded on the fixing plate, and the fixing plate is connected to the base through screws.

4. The special fixture for a tubular sintering furnace according to claim 1, characterized in that: The bevel gear (13) and the eccentric wheel (12) are connected to the shaft (11) via a key (17).

5. The special fixture for a tubular sintering furnace according to claim 1, characterized in that: The transmission mechanism is composed of a thread transmission, a gear rack transmission and an eccentric wheel transmission, and the clamping force at both ends of the sample can be accurately controlled by adjusting the feed amount of the bolt (16).

6. A special fixture for a tubular sintering furnace, characterized in that: The steps include: S1: Determine the load to be applied in the welding experiment and calculate the corresponding compression of the spring (2) under the load; S2: Place the welding sample on the V-shaped block (6) of the fixture and adjust the slider (7) so that both ends of the sample are in contact with the slider (7); S3: Record the initial length of the spring (2) by the ruler on the V-block (6), and calculate the length under the working load; S4: Adjust the feed rate of the bolt (16) to increase the compressive stress at both ends of the test piece (4) to the working load through bolt transmission, gear rack transmission and eccentric wheel transmission.

7. The special fixture according to claim 1, characterized in that: For the welding test of cylindrical specimens with a diameter of 10 to 15 mm, positioning and clamping were carried out, and the maximum load applied was 80 MPa.

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