Gas tightness detection machine for gas furnace

Abstract

The invention provides a gas furnace gas tightness detection machine, which comprises a rack and a pressure valve mechanism installed on the rack, the pressure valve mechanism comprises a cylinder installed on the rack and a connecting arm connected with a longitudinal telescopic rod of the cylinder, a steering motor is installed 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 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] The invention relates to the technical field of gas furnace manufacturing, in particular to a gas furnace air tightness detection machine. Background Art

[0002] Gas furnaces usually have multiple burners, each of which corresponds to a switch valve. The gas entering the gas furnace is connected to each burner and the switch valve through a pipeline. The switch valve, pipeline and seals may have quality problems during the material selection, processing and assembly process. The gas furnace must pass a strict air tightness test before leaving the factory to ensure that there is no gas leakage in the working state of the gas furnace. In order to meet the needs of batch testing, each gas furnace needs to undergo a series of actions such as ventilation, blocking the burner nozzle, opening the switch valve and air intake testing after entering the testing station, so as to specifically detect whether the gas path system of the gas furnace is tight, prevent gas leakage and ensure safe use. The mechanism for opening the switch valve in the existing testing equipment is relatively simple, and the pressure control of the valve body shaft is poor when pressing down, and the switch valve body may be damaged due to the mismatch of the coaxiality with the valve body shaft during the pressing process. Summary of the invention

[0003] In view of the above-mentioned deficiencies in the prior art, an object of the present invention is to provide a gas furnace air tightness detection machine which has a simple structure and can continuously perform multiple circuits.

[0004] The present invention achieves the above object by: A gas furnace air tightness detection machine is provided, comprising a frame, a valve pressing mechanism installed on the frame, the valve pressing mechanism comprising a cylinder installed on the frame and a connecting arm connected to a longitudinal telescopic rod of the cylinder, a steering motor is installed on the connecting arm, a universal coupling is installed on the longitudinal output shaft of the steering motor, a buffer spring is sleeved on the working shaft of the universal coupling, and a clamping cylinder capable of clamping a valve body shaft is installed at the end.

[0005] Furthermore, an elastic coupling is mounted between the buffer spring and the clamping finger cylinder.

[0006] Furthermore, a double cross bar is provided above the frame, a transverse slide is mounted on the double cross bar, 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, and a guide rail cooperating with the slider is provided on the inner side of the longitudinal plate.

[0007] Furthermore, the frame includes a hollow conveying platform, under which a lifting bracket is movably installed through a linear module, and the lifting bracket includes a base, a lifting cylinder installed on the base, and a U-shaped top frame connected to the telescopic rod of the lifting cylinder.

[0008] Furthermore, a gas furnace support plate is movably mounted on one end of the conveying platform through a linear module, and the width of the support plate is smaller than the distance between the U-shaped top frames.

[0009] The U-shaped top frame includes a bottom plate and a top plate arranged at the front and rear sides of the conveying platform.

[0010] A roller frame is installed at the other end of the conveying platform, and transversely arranged conveying rollers are installed in the roller frame. The width of the roller frame is smaller than the distance between the frames of the U-shaped top frame.

[0011] Beneficial effects of the invention: The invention provides a gas furnace air tightness detection machine, comprising a frame, a valve pressing mechanism installed on the frame, the valve pressing mechanism comprising a cylinder installed on the frame and a connecting arm connected to the longitudinal telescopic rod of the cylinder, a steering motor installed on the connecting arm, a universal coupling installed on the longitudinal output shaft of the steering motor, a buffer spring installed on the working shaft of the universal coupling, and a clamping cylinder capable of clamping the valve body shaft 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 detection process. In order to ensure that the valve body shaft is lowered into place, the downward stroke of the cylinder is large, while the actual downward stroke of the valve body shaft is short. In order to avoid damage to the valve body shaft, the buffer spring is compressed when the cylinder is pressed down, thereby consuming excess downward force and stroke, and also absorbing part of the vibration, thereby avoiding damage to the valve body shaft due to overpressure. The universal coupling can compensate for the eccentricity, deflection and axial deviation that may occur during the process of pressing down the valve body shaft, and further ensure that the valve body shaft is not damaged during the detection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to make the technical problems to be solved by the present invention, the technical means adopted and the beneficial effects more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 A schematic diagram of the three-dimensional structure of an embodiment of a gas furnace air tightness detection machine; Figure 2 for Figure 1 Schematic diagram of the structure of each workstation; Figure 3 for Figure 1 Schematic diagram of the medium pressure valve mechanism structure; Figure 4 for Figure 1 Another perspective structural diagram; Figure 5 It is a schematic diagram of the lifting bracket structure.

[0013] In the figure, 1 is a frame, 11 is a double cross bar, 12 is a horizontal slide, 13 is a longitudinal plate, 14 is a guide rail, 15 is a conveying platform, 15 is a support plate, 2 is a pressure valve mechanism, 21 is a cylinder, 22 is a connecting arm, 22 is a slider, 23 is a steering motor, 24 is a universal joint, 24 is a working shaft, 25 is a buffer spring, 26 is a clamping cylinder, 27 is an elastic coupling, 3 is a lifting bracket, 31 is a base, 32 is a lifting cylinder, 33 is a U-shaped top frame, 33 is a bottom plate, 33 is a top plate, 41 is a roller frame, and 42 is a conveying roller. DETAILED DESCRIPTION

[0014] The gas furnace air tightness detection machine of the present invention comprises a frame 1, a valve pressing mechanism 2 installed on the frame 1, the valve pressing mechanism 2 comprises a cylinder 21 installed on the frame 1 and a connecting arm 22 connected to the longitudinal telescopic rod of the cylinder 21, a steering motor 23 is installed on the connecting arm 22, the longitudinal output shaft of the steering motor 23 is equipped with a universal coupling 24, a buffer spring 25 is sleeved on the working shaft 241 of the universal coupling 24, and a clamping cylinder 26 for clamping the valve body shaft is installed at the end.

[0015] As attached Figures 1 to 5 As shown, the valve pressing mechanism 2 installed on the frame 1 is responsible for pressing down, clamping and rotating the valve body shaft of the switch valve by 90 degrees during the detection process. The number and position of the valve pressing mechanism 2 can correspond to the situation of the switch valve installed on the gas furnace to be detected. The specific 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 installed on the connecting arm 22 in the longitudinal direction. The output shaft of the steering motor 23 extends downward, and the end of the working shaft 241 at the lower end of the universal coupling 24 is installed with a clamping cylinder 26, and the buffer spring 25 is sleeved outside the working shaft 241. During operation, the telescopic rod of the cylinder 21 extends downward, driving the connecting arm 22 to move downward, and the steering motor 23 on the connecting arm 22 drives the clamping cylinder 26 to move downward through the working shaft 241 of the coupling 24, and presses down the valve body axis of the switch valve of the gas furnace into place, and then the clamping cylinder 26 holds the valve body axis horizontally, and the steering motor 23 rotates 90 degrees to open the switch valve for air tightness detection. When the detection is completed, the clamping cylinder 26 releases the valve body axis, the telescopic rod of the cylinder 21 retreats upward, and the steering motor 23 rotates in the opposite direction to reset the clamping cylinder 26.

[0016] In the above detection process, in order to ensure that the valve body shaft is in place, the downward stroke of the cylinder 21 is large, while the actual downward stroke of the valve body shaft is short. In order to avoid damage to the valve body shaft, the buffer spring 25 is compressed when the cylinder 21 is pressed down, thereby consuming the excess downward force and stroke, and also absorbing part of the vibration to avoid damage to the valve body shaft due to overpressure. The universal coupling 24 can compensate for the eccentricity, deflection, and axial deviation that may occur during the process of pressing the valve body shaft down, further ensuring that the valve body shaft is not damaged during the detection process.

[0017] Preferably, an elastic coupling 27 is also mounted between the buffer spring 25 and the clamping finger cylinder 26 .

[0018] As shown in the accompanying drawings, the bottom of the buffer spring 25 is pressed against the top of the elastic coupling 27, and cooperates with the elastic coupling 27 to more effectively neutralize the angular deviation of the valve body axis. At the same time, it can ensure that the clamping cylinder 26 runs smoothly with low inertia and high response during rotation, ensuring that the valve body axis rotates into place.

[0019] Preferably, a double cross bar 11 is provided above the frame 1, a transverse slide 12 is mounted on the double cross bar 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 cooperating with the slider 221 is provided on the inner side of the longitudinal plate 13.

[0020] As shown in the accompanying drawings, the telescopic rod of the cylinder 21 passes downward through the transverse slide 12 and is connected to the connecting arm 22. When the telescopic rod of the cylinder 21 moves downward, the connecting arm 22 moves downward along the longitudinal guide rail 14 through the slider 221, so that the connecting arm 22 is more stable during the downward process, thereby ensuring that the finger-clamping cylinder 26 at the end has a more precise stroke when pressing down the valve body shaft.

[0021] Preferably, the frame 1 includes a hollow conveying platform 15, under which a lifting bracket 3 is movably mounted via a linear module, the lifting bracket 3 including a base 31, a lifting cylinder 32 mounted on the base 31, and a U-shaped top frame 33 connected to a telescopic rod of the lifting cylinder 33.

[0022] As shown in the attached figure, there is a gap before and after the conveying platform 15, and the gas furnace to be tested is set in the middle of the conveying platform 15. The lifting bracket 3 can be moved by the linear module set in the middle of the bottom of the frame 1. When it moves to the bottom of the gas furnace in the middle, the lifting cylinder 32 lifts the U-shaped top frame 33, so that the U-shaped top frame 33 rises in the gap before and after the conveying platform 15, and lifts the gas furnace upward to the set detection working position. When the detection is completed, the lifting cylinder 32 descends, and the Zhenjing module drives the lifting bracket 3 and the gas furnace on it to move horizontally to the next station. The lifting bracket 3 enables the detection and transfer of the gas furnace to be carried out continuously, which is conducive to realizing an automated production inspection line and improving production efficiency.

[0023] Preferably, a gas furnace support plate 151 is movably mounted on one end of the conveying platform 15 through a linear module, and the width of the support plate 151 is smaller than the distance between the U-shaped top frames 33 .

[0024] As shown in the attached drawings, three stations are arranged along the length direction of the conveying platform 15. A linear module is installed between the first station on the right side of the conveying platform 15 and the second station in the middle. The linear module is arranged in the middle of the conveying platform 15, and a gap is left on the front and rear sides. The pallet 151 is fixed on the linear module. After the gas furnace to be inspected is placed on the pallet 151, it can move back and forth between the first station and the second station with the linear module. When the gas furnace is sent to the second station in the middle, the lifting bracket 3 also moves to the middle of the conveying platform 15. Since the width of the pallet 151 is less than the distance between the U-shaped top frame 33, the U-shaped top frame 33 of the lifting bracket 3 can rise from both sides of the pallet 151, lift the gas furnace and detach from the pallet 151, and the pallet 151 can return to the first station. The pallet 151 can make the transportation of the gas furnace and the subsequent inspection work proceed continuously, further optimizing the automated production inspection operation.

[0025] Preferably, the U-shaped top frame 33 includes a bottom plate 331 and a top plate 332 arranged on the front and rear sides of the conveying platform 15 .

[0026] As shown in the accompanying drawings, the U-shaped top frame 33 of the split structure is very convenient to process and assemble. A plurality of through holes are provided on the top plate 332 located before and after the conveying platform 15, so as to be convenient to observe the internal working conditions and also to be convenient for maintenance.

[0027] Preferably, a roller frame 41 is installed at the other end of the conveying platform 15 , and transversely arranged conveying rollers 42 are installed in the roller frame 41 . The width of the roller frame 41 is smaller than the distance between the U-shaped top frames 33 .

[0028] As shown in the accompanying drawings, the roller frame 41 is arranged on the third station at the other end of the conveying platform 15. When the gas furnace is inspected in the middle of the frame, the lifting bracket 3 descends with the gas furnace and retreats to the third station through the linear module. Since the width of the roller frame 41 is smaller 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 conveying platform 15, so that the gas furnace is located above the roller frame 41. The lifting bracket 3 descends to the starting position, and the gas furnace can be transported horizontally to the next station through the conveying roller 42, so that the gas furnace that has been inspected and subsequent packaging and other work can be carried out continuously, further optimizing the automated production inspection operation.

[0029] In the detailed description of the present invention, the terms "upper", "lower", "left", "right", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying that the equipment or components referred to must have a specific direction or positional relationship, and therefore cannot be understood as limiting the present invention. It can be understood that the above embodiments only express the preferred implementation mode of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention; it should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, the above technical features can be freely combined, and several deformations and improvements can be made, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made to the claims and scope of the present invention should belong to the scope of coverage of the claims of the present invention.

Claims

1. A gas furnace air tightness detection machine, characterized in that: The invention comprises a frame (1), a valve pressing mechanism (2) mounted on the frame (1), the valve pressing mechanism (2) comprising a cylinder (21) mounted on the frame (1) and a connecting arm (22) connected to a longitudinal telescopic rod of the cylinder (21), a steering motor (23) being mounted on the connecting arm (22), a universal coupling (24) being mounted on the longitudinal output shaft of the steering motor (23), a buffer spring (25) being sleeved on the working shaft (241) of the universal coupling (24), and a clamping cylinder (26) capable of clamping a valve body shaft being mounted at the end thereof.

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

3. The gas furnace air tightness detection machine according to claim 1, characterized in that: A double cross bar (11) is provided above the frame (1), a transverse slide (12) is mounted on the double cross bar (11), a longitudinal plate (13) is provided on the front side of the transverse slide (12), the cylinder (21) is mounted on the transverse slide (12), a slide block (221) is provided on the front side of the connecting arm (22), and a guide rail (14) cooperating with the slide block (221) is provided on the inner side of the longitudinal plate (13).

4. The gas furnace air tightness detection machine according to claim 1, characterized in that: The frame (1) comprises a hollow conveying platform (15), and a lifting bracket (3) is movably mounted below the conveying platform (15) via a linear module. The lifting bracket (3) comprises a base (31), a lifting cylinder (32) mounted on the base (31), and a U-shaped top frame (33) connected to a telescopic rod of the lifting cylinder (33).

5. The gas furnace air tightness detection machine according to claim 4, characterized in that: A gas furnace support plate (151) is movably mounted on one end of the conveying platform (15) via a linear module, and the width of the support plate (151) is smaller than the distance between the U-shaped top frames (33).

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

7. The gas furnace air tightness detection machine according to claim 4, characterized in that: A roller frame (41) is installed at the other end of the conveying platform (15), and transversely arranged conveying rollers (42) are installed in the roller frame (41). The width of the roller frame (41) is smaller than the distance between the U-shaped top frames (33).

Images