Gas tightness detection machine for gas furnace

Abstract

The utility model provides a gas furnace gas tightness detection machine, which comprises a rack and a pressure valve mechanism arranged on the rack, the pressure valve mechanism comprises a cylinder arranged on the rack and a connecting arm connected with a longitudinal telescopic rod of the cylinder, a steering motor is arranged on the connecting arm, a longitudinal output shaft of the steering motor is provided with a universal coupling, and the universal coupling is connected with the vertical telescopic rod of the cylinder. A working shaft of the universal coupling is sleeved with a buffer spring, and the end of the working shaft is provided with a finger clamping air cylinder capable of clamping a valve body shaft. The valve pressing mechanism is responsible for pressing, clamping and rotating a valve body shaft of the switch valve by 90 degrees in the detection process. The downward pressing stroke of the air cylinder is large, the actual downward pressing stroke of the valve body shaft is short, in order to prevent the valve body shaft from being damaged, the buffer spring is pressed when the air cylinder is pressed downwards, redundant downward pressing force and stroke are consumed, meanwhile, part of vibration is absorbed, and the valve body shaft is prevented from being damaged due to overpressure. The universal coupling can compensate eccentricity, deflection angle and axial deviation possibly occurring in the process of pressing down the valve body shaft, and it is further guaranteed that the valve body shaft is not damaged in the detection process.

Description

Technical Field

[0001] This utility model relates to the field of gas furnace manufacturing technology, and in particular to a gas furnace airtightness testing machine. Background Technology

[0002] Gas stoves typically have multiple burners, each corresponding to a switch valve. Gas entering the stove is piped to each burner and switch valve. Quality issues may arise in the selection of materials, processing, and assembly of the switch valves, pipes, and seals. Gas stoves must undergo rigorous airtightness testing before leaving the factory to ensure no gas leakage during operation. To meet the needs of batch testing, each gas stove undergoes a series of actions upon entering the testing station, including venting, sealing the burner nozzles, opening the switch valves, and conducting air intake checks. This process specifically verifies the airtightness of the gas system, prevents gas leakage, and ensures safe operation. Existing testing equipment has a rudimentary mechanism for opening the switch valves, resulting in poor control of the downward pressure on the valve body shaft. Furthermore, misalignment with the valve body shaft during pressure application can damage the switch valve body. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a gas furnace airtightness testing machine with a simple structure that can continuously perform multiple circuits.

[0004] The present invention achieves the above objectives as follows:

[0005] A gas furnace air tightness testing machine is provided, including a frame and a pressure valve mechanism mounted on the frame. The pressure valve mechanism includes a cylinder mounted on the frame and a connecting arm connected to the longitudinal extension rod of the cylinder. A steering motor is mounted on the connecting arm. A universal coupling is mounted on the longitudinal output shaft of the steering motor. A buffer spring is fitted on the working shaft of the universal coupling, and a finger-clamping cylinder for clamping the valve body shaft is mounted at the end.

[0006] Furthermore, an elastic coupling is also fitted between the buffer spring and the finger-clamping cylinder.

[0007] Furthermore, the frame is provided with double crossbars, and a transverse slide is fitted on the double crossbars. A longitudinal plate is provided on the front side of the transverse slide. The cylinder is installed on the transverse slide. A slider is provided on the front side of the connecting arm. A guide rail that cooperates with the slider is provided on the inner side of the longitudinal plate.

[0008] Furthermore, the frame includes a hollowed-out conveying platform, and a lifting bracket is movably installed below the conveying platform via a linear module. The lifting bracket includes a base, a lifting cylinder mounted on the base, and a U-shaped top frame connected to the telescopic rod of the lifting cylinder.

[0009] Furthermore, a gas furnace pallet is movably mounted on one end of the conveying platform via a linear module, and the width of the pallet is smaller than the inter-frame distance of the U-shaped top frame.

[0010] The U-shaped top frame includes a base plate and a top plate located on the front and rear sides of the conveying platform.

[0011] A roller frame is installed at the other end of the conveying platform. The roller frame contains horizontally arranged conveying rollers, and the width of the roller frame is smaller than the distance between the U-shaped top frame.

[0012] The beneficial effects of this utility model are as follows: This utility model provides a gas furnace airtightness testing machine, including a frame and a valve pressing mechanism mounted on the frame. The valve pressing mechanism includes a cylinder mounted on the frame and a connecting arm connecting the longitudinal extension rod of the cylinder. A steering motor is mounted on the connecting arm, and a universal coupling is mounted on the longitudinal output shaft of the steering motor. A buffer spring is fitted on the working shaft of the universal coupling, and a clamping finger cylinder for clamping the valve body shaft is installed at the end. The valve pressing mechanism is responsible for pressing down, clamping, and rotating the valve body shaft of the switch valve by 90 degrees during the testing process. To ensure that the valve body shaft descends to the correct position, the cylinder's downward stroke is relatively large, while the actual downward stroke of the valve body shaft is relatively short. To avoid damage to the valve body shaft, the buffer spring is compressed when the cylinder presses down, thereby consuming excess downward force and stroke, and also absorbing some vibration, preventing damage to the valve body shaft due to overpressure. The universal coupling can compensate for possible eccentricity, angular deviation, and axial deviation during the pressing down of the valve body shaft, further ensuring that the valve body shaft is not damaged during the testing process. Attached Figure Description

[0013] To make the technical problem to be solved by this utility model, the technical means adopted, and the beneficial effects clearer, the utility model will be further described in detail below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 A three-dimensional structural schematic diagram of one embodiment of a gas furnace airtightness testing machine;

[0015] Figure 2 for Figure 1 Schematic diagram of each workstation structure;

[0016] Figure 3 for Figure 1 Schematic diagram of the medium-pressure valve mechanism;

[0017] Figure 4 for Figure 1 Another perspective structural diagram;

[0018] Figure 5 This is a schematic diagram of the lifting bracket structure.

[0019] In the diagram, 1 is the frame, 11 is the double crossbar, 12 is the transverse slide, 13 is the longitudinal plate, 14 is the guide rail, 15 is the conveying platform, 151 is the pallet, 2 is the pressure valve mechanism, 21 is the cylinder, 22 is the connecting arm, 221 is the slider, 23 is the steering motor, 24 is the universal coupling, 241 is the working shaft, 25 is the buffer spring, 26 is the finger-clamping cylinder, 27 is the elastic coupling, 3 is the lifting bracket, 31 is the base, 32 is the lifting cylinder, 33 is the U-shaped top frame, 331 is the bottom plate, 332 is the top plate, 41 is the roller frame, and 42 is the conveying roller. Detailed Implementation

[0020] The gas furnace air tightness testing machine of this utility model includes a frame 1 and a pressure valve mechanism 2 mounted on the frame 1. The pressure valve mechanism 2 includes a cylinder 21 mounted on the frame 1 and a connecting arm 22 connecting the longitudinal extension rod of the cylinder 21. A steering motor 23 is mounted on the connecting arm 22. A universal coupling 24 is mounted on the longitudinal output shaft of the steering motor 23. A buffer spring 25 is fitted on the working shaft 241 of the universal coupling 24, and a finger-clamping cylinder 26 that can clamp the valve body shaft is mounted at the end.

[0021] As attached Figures 1 to 5 As shown, the valve pressing mechanism 2, mounted on the frame 1, is responsible for pressing down, clamping, and rotating the valve body shaft of the switching valve by 90 degrees during the testing process. The number and position of the valve pressing mechanism 2 can correspond to the switching valves installed on the gas furnace under test. Specifically, the cylinder 21 can be a linear cylinder that provides linear motion. The telescopic rod of the cylinder 21 is connected to the connecting arm 22. The steering motor 23 is mounted longitudinally on the connecting arm 22. The output shaft of the steering motor 23 extends downward and is connected to the working shaft 241 at the lower end of the universal coupling 24. A finger-clamping cylinder 26 is installed at the end of the working shaft 241. A buffer spring 25 is fitted outside the working shaft 241. During operation, the telescopic rod of cylinder 21 extends downward, driving the connecting arm 22 to move downward. The steering motor 23 on the connecting arm 22 drives the finger-clamping cylinder 26 to move downward through the working shaft 241 of the coupling 24, and presses down the valve body shaft of the gas furnace's switch valve into place. Then, the finger-clamping cylinder 26 clamps the valve body shaft laterally, and the steering motor 23 rotates 90 degrees to open the switch valve for airtightness testing. After the test is completed, the finger-clamping cylinder 26 releases the valve body shaft, the telescopic rod of cylinder 21 retracts upward, and the steering motor 23 rotates in the opposite direction to reset the finger-clamping cylinder 26.

[0022] During the aforementioned testing process, to ensure the valve body shaft descends to its designated position, the downward stroke of cylinder 21 is relatively large, while the actual downward stroke of the valve body shaft is relatively short. To avoid damage to the valve body shaft, the buffer spring 25 is compressed when cylinder 21 descends, thereby consuming excess downward force and stroke, and also absorbing some vibration, preventing damage to the valve body shaft due to overpressure. The universal coupling 24 can compensate for possible eccentricity, angular deviation, and axial misalignment during the downward compression of the valve body shaft, further ensuring that the valve body shaft is not damaged during the testing process.

[0023] Preferably, an elastic coupling 27 is also fitted between the buffer spring 25 and the finger-clamping cylinder 26.

[0024] As shown in the attached figure, the bottom of the buffer spring 25 presses against the top of the elastic coupling 27. In cooperation with the elastic coupling 27, it can more effectively neutralize the angular deviation of the valve body shaft. At the same time, it can ensure that the finger-clamping cylinder 26 operates smoothly with low inertia and high response during rotation, ensuring that the valve body shaft rotates into place.

[0025] Preferably, the frame 1 is provided with a double crossbar 11, a transverse slide 12 is fitted on the double crossbar 11, a longitudinal plate 13 is provided on the front side of the transverse slide 12, the cylinder 21 is installed on the transverse slide 12, a slider 221 is provided on the front side of the connecting arm 22, and a guide rail 14 that cooperates with the slider 221 is provided on the inner side of the longitudinal plate 13.

[0026] As shown in the attached figure, the telescopic rod of cylinder 21 passes downward through the transverse slide 12 and connects to the connecting arm 22. When the telescopic rod of cylinder 21 moves downward, the connecting arm 22 moves downward along the longitudinal guide rail 14 via the slider 221, making the connecting arm 22 more stable during the downward movement, thereby ensuring that the end finger-clamping cylinder 26 has a more accurate stroke when pressing down the valve body shaft.

[0027] Preferably, the frame 1 includes a hollowed-out conveying platform 15, and a lifting bracket 3 is movably installed below the conveying platform 15 via a linear module. The lifting bracket 3 includes a base 31, a lifting cylinder 32 installed on the base 31, and a U-shaped top frame 33 connected to the telescopic rod of the lifting cylinder 32.

[0028] As shown in the attached diagram, a gap is left at the front and back of the conveyor platform 15. The gas furnace to be tested is mounted in the middle of the conveyor platform 15. The lifting bracket 3 can be moved via a linear module located in the middle of the bottom of the frame 1. When it moves to the middle of the gas furnace, the lifting cylinder 32 lifts the U-shaped top frame 33, causing the U-shaped top frame 33 to rise within the gap at the front and back of the conveyor platform 15, and lift the gas furnace to the set testing position. After the test is completed, the lifting cylinder 32 descends, and the linear module drives the lifting bracket 3 and the gas furnace on it to the next work station. The lifting bracket 3 enables the continuous operation of testing and transferring the gas furnace, which is beneficial for realizing an automated production testing line and improving production efficiency.

[0029] Preferably, one end of the conveying platform 15 is movably mounted with a gas furnace pallet 151 via a linear module, and the width of the pallet 151 is smaller than the inter-frame distance of the U-shaped top frame 33.

[0030] As shown in the attached diagram, three workstations are arranged along the length of the conveyor platform 15. A linear module is installed between the first workstation on the right side and the second workstation in the middle of the conveyor platform 15. The linear module is located in the middle of the conveyor platform 15, with gaps left on the front and rear sides. The pallet 151 is fixed on the linear module. After the gas furnace to be tested is placed on the pallet 151, it can move back and forth between workstation one and workstation two with the linear module. When the gas furnace is delivered to the middle second workstation, the lifting bracket 3 also moves to the middle of the conveyor platform 15. Since the width of the pallet 151 is less than the distance between the U-shaped top brackets 33, the U-shaped top brackets 33 of the lifting bracket 3 can rise from both sides of the pallet 151, lifting the gas furnace and detaching it from the pallet 151. The pallet 151 can then return to workstation one. The pallet 151 allows for the continuous transport of the gas furnace and subsequent testing work, further optimizing automated production and testing operations.

[0031] Preferably, the U-shaped top frame 33 includes a bottom plate 331 and a top plate 332 disposed on the front and rear sides of the conveying platform 15.

[0032] As shown in the attached diagram, the U-shaped top frame 33 with its split structure is very easy to process and assemble. Multiple through holes are provided on the top plate 332 located before and after the conveyor platform 15, facilitating observation of the internal working conditions and simplifying maintenance.

[0033] Preferably, a roller frame 41 is installed at the other end of the conveying platform 15, and a transversely arranged conveying roller 42 is installed inside the roller frame 41. The width of the roller frame 41 is smaller than the inter-frame distance of the U-shaped top frame 33.

[0034] As shown in the attached diagram, the roller frame 41 is located at the third station on the other end of the conveyor platform 15. After the gas furnace is inspected in the middle of the frame, the lifting bracket 3 lowers the gas furnace and returns to the third station via the linear module. Since the width of the roller frame 41 is less than the distance between the U-shaped top frame 33, the U-shaped top frame 33 can enter the gap between the roller frame 41 and the conveyor platform 15, so that the gas furnace is located above the roller frame 41. The lifting bracket 3 lowers to the starting position, and the gas furnace can be transported laterally to the next station via the conveyor roller 42. This allows the inspected gas furnace and subsequent packaging work to be carried out continuously, further optimizing the automated production and inspection operations.

[0035] In the detailed description of this utility model, the terms "upper," "lower," "left," "right," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not indicate or imply that the device or component referred to must have a specific orientation or positional relationship. Therefore, they should not be construed as limitations on this utility model. It is understood that the above embodiments only illustrate preferred embodiments of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model patent. It should be noted that for those skilled in the art, without departing from the concept of this utility model, the above technical features can be freely combined, and several modifications and improvements can be made. These all fall within the protection scope of this utility model. Therefore, all equivalent transformations and modifications made with respect to the claims and scope of this utility model should fall within the coverage of the claims of this utility model.

Claims

1. A gas furnace airtightness testing machine, characterized in that: The device includes a frame (1) and a pressure valve mechanism (2) mounted on the frame (1). The pressure valve mechanism (2) includes a cylinder (21) mounted on the frame (1) and a connecting arm (22) connecting the longitudinal telescopic rod of the cylinder (21). A steering motor (23) is mounted on the connecting arm (22). A universal coupling (24) is mounted on the longitudinal output shaft of the steering motor (23). A buffer spring (25) is fitted on the working shaft (241) of the universal coupling (24), and a finger-clamping cylinder (26) that can clamp the valve body shaft is mounted at the end.

2. The gas furnace airtightness testing machine according to claim 1, characterized in that: An elastic coupling (27) is also fitted between the buffer spring (25) and the finger-clamping cylinder (26).

3. The gas furnace airtightness testing machine according to claim 1, characterized in that: The frame (1) is provided with a double crossbar (11) above it. A transverse slide (12) is fitted on the double crossbar (11). A longitudinal plate (13) is provided on the front side of the transverse slide (12). The cylinder (21) is installed on the transverse slide (12). A slider (221) is provided on the front side of the connecting arm (22). A guide rail (14) that cooperates with the slider (221) is provided on the inner side of the longitudinal plate (13).

4. The gas furnace airtightness testing machine according to claim 1, characterized in that: The frame (1) includes a hollowed-out conveying platform (15), and a lifting bracket (3) is movably installed below the conveying platform (15) via a linear module. The lifting bracket (3) includes a base (31), a lifting cylinder (32) installed on the base (31), and a U-shaped top frame (33) connected to the telescopic rod of the lifting cylinder (32).

5. The gas furnace airtightness testing machine according to claim 4, characterized in that: One end of the conveying platform (15) is movably mounted with a gas furnace pallet (151) via a linear module. The width of the pallet (151) is smaller than the distance between the U-shaped top frame (33).

6. The gas furnace airtightness testing machine according to claim 4, characterized in that: The U-shaped top frame (33) includes a bottom plate (331) and a top plate (332) located on the front and rear sides of the conveying platform (15).

7. The gas furnace airtightness testing machine according to claim 4, characterized in that: The other end of the conveying platform (15) is equipped with a roller frame (41), and the roller frame (41) is equipped with transversely arranged conveying rollers (42). The width of the roller frame (41) is smaller than the distance between the frames of the U-shaped top frame (33).

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