Upper pressing plate and base plate fixing structure for wheel hub air tightness detection mechanism and wheel hub air tightness detection mechanism

Abstract

The utility model belongs to the technical field of hub detection, and particularly relates to a hub airtightness detection mechanism. A hub air tightness detection mechanism with an upper pressing plate and base plate fixing structure comprises a water tank, an upper pressing plate, a lower pressing plate and an upper driver, the water tank is matched with a lower driver, a base plate is arranged at the lower end of the upper pressing plate, the upper pressing plate is provided with a gas channel, the base plate is provided with a gas outlet hole communicated with the gas channel, and the gas outlet hole is communicated with the gas channel. A fixing piece is fixed to the upper pressing plate and provided with a first section located on the upper side of the upper pressing plate and a second section located on the outer side of the upper pressing plate in the circumferential direction, the upper pressing plate is provided with an upper fixing hole with a vertical upward opening, and a side fixing hole with a lateral opening is formed in the side wall of the base plate. The fixing piece is fixed to the upper fixing hole through a first fastening piece and provided with a second fastening piece used for stretching into the side fixing hole. The utility model has the advantages that the safety factor can be improved, and the potential safety hazard is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of wheel hub detection devices, and in particular relates to a wheel hub air tightness detection mechanism. Background Art

[0002] The air tightness of the wheel hub needs to be tested before it leaves the factory. The usual testing method is the water tank air tightness test, that is, the upper pressure plate is driven downward by the air cylinder or oil cylinder so that the upper and lower pressure plates press the axial ends of the wheel hub tightly. Then, high-pressure gas is filled into the inner cavity of the wheel hub, and then the wheel hub is immersed in the water tank. The operator observes whether bubbles are generated in the circumferential direction of the wheel hub, so as to judge whether the air tightness of the wheel hub is good. Usually, the upper pressure plate is connected to the piston rod of the air cylinder or oil cylinder. The upper pressure plate is generally an iron plate or a steel plate. A pad made of soft rubber material is fixed at the lower end of the upper pressure plate. The pad is used to contact the axial end face of the wheel hub workpiece, so as to ensure good sealing when the wheel hub is pressed. For example, the Chinese patent with application number 201510055661.9 discloses a method for detecting the air tightness of an aluminum alloy wheel hub. The pressure plate (pad) in the patent is composed of soft rubber.

[0003] Usually, the upper pressing plate and the pad are fixed by screws. For example, the Chinese patent with application number 201721274627.1 discloses a wheel hub air tightness detection device, in which the upper sealing plate (pad) is connected to the bottom of the pressing plate (upper pressing plate) by screws. There are usually two ways of screw fixing. The first is that the screw passes through the pad from bottom to top and matches with the thread of the upper pressing plate. However, the screw head of this scheme is located at the lower end of the pad, which will lead to poor air tightness of the pad; the second is that the screw passes through the upper pressing plate from top to bottom and matches with the threaded hole of the pad. In this way, due to the soft material of the pad, when the upper pressing plate is pressed down, the pad itself will be deformed to a certain extent, and the threaded hole of the pad will be greatly affected by the deformation. After the upper pressing plate is used for a long time, the deformation of the threaded hole will cause the screw to loosen, causing the pad to be unable to fit the upper pressing plate, and it is difficult to ensure that the pad is in a horizontal position, so that the upper pressing plate will leak high-pressure gas when it is pressed against the wheel hub and inflated. In severe cases, it may also cause the pad to fall off and cause safety hazards. Utility Model Content

[0004] The utility model aims to provide a hub air tightness detection mechanism which makes the fixation between the upper pressure plate and the backing plate more reliable, thereby improving the safety factor and reducing potential safety hazards.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme: an upper pressure plate and a pad fixing structure for a wheel hub air tightness detection mechanism, the pad is fixed to the lower end surface of the upper pressure plate, the upper pressure plate is provided with a gas channel connected to the inflation tube, the pad is provided with an air outlet connected to the gas channel, a plurality of fixing parts are fixed at the outer edge of the upper end surface of the upper pressure plate, the fixing part has a first section located on the upper side of the upper pressure plate and a second section located on the circumferential outer side of the upper pressure plate, the side wall of the second section is in contact with the circumferential side wall of the upper pressure plate and the circumferential side wall of the pad, the upper pressure plate is provided with an upper fixing hole opening vertically upward, the side wall of the pad is provided with a side fixing hole opening laterally, the fixing part is fixed at the upper fixing hole by a first fastener, and the fixing part has a second fastener for extending into the side fixing hole.

[0006] When fixing the upper pressing plate and the backing plate, the first section of the fixing piece is brought into contact with the upper end surface of the upper pressing plate, and then the first fastener is passed downward through the first section and fixed to the upper fixing hole of the upper pressing plate; the second section of the fixing piece is brought into contact with the circumferential side walls of the upper pressing plate and the backing plate, and then the second fastener is passed horizontally through the second section and inserted into the side fixing hole of the backing plate, thereby fixing the upper pressing plate and the backing plate. The second fastener is tightly matched with the side fixing hole.

[0007] This solution uses a first section of the fixing member to be fixed to the upper pressure plate through a first fastener, and then a second fastener is used to pass through the second section and cooperate with the side fixing hole of the pad, thereby achieving fixation between the pad and the upper pressure plate. The second fastener is arranged horizontally to support the pad. Compared with the comparative document, this solution does not need to set vertical screw holes on the pad, thereby avoiding deformation of the threaded holes and loosening of the screws, which may cause the pad to be unable to fit tightly against the upper pressure plate or fall off, causing safety hazards; this solution makes the fixation between the upper pressure plate and the pad more reliable, thereby improving the safety factor of the device and reducing the occurrence of safety hazards.

[0008] Preferably, the side fixing holes of the backing plate extend radially along the backing plate.

[0009] The radially extending side fixing hole allows the second fastener to be perpendicular to the second section, which makes it easier to insert the second fastener.

[0010] Preferably, at least three fixing members are arranged in a ring shape and at even intervals on the upper pressing plate. The even interval arrangement can make the fixing members more stable when fixing.

[0011] Preferably, the second fastener is tightly fitted in the side fixing hole.

[0012] Compared with threaded fit, tight fit can further avoid deformation of threaded holes. Tight fit can be achieved by means of positioning pins and pin holes.

[0013] A wheel hub air tightness detection mechanism with an upper pressure plate and a pad fixing structure for the wheel hub air tightness detection mechanism, comprising a frame, a water tank, the upper pressure plate, a lower pressure plate for supporting a workpiece, an upper driver for driving the upper pressure plate to rise and fall, the water tank being equipped with a lower driver for positioning the lower pressure plate within the water tank, the inflation pipe being connected to an air pressure detector and being equipped with a pressure relief valve.

[0014] The inflation pipe is connected to a gas pressure detector. When the gas pressure in the wheel hub cavity is too high, the operator observes the value of the gas detector and releases the pressure in the wheel hub cavity through the pressure relief valve to avoid potential safety hazards. The upper drive and the lower drive can be air cylinders or oil cylinders.

[0015] Preferably, the upper pressure plate or pad has two limit members arranged side by side and extending outward, a connecting plate is fixed on the shell of the upper driver, the upper pressure plate and the lower pressure plate are both located at the lower side of the connecting plate, the width of the upper pressure plate is smaller than the width of the connecting plate and the lower pressure plate, the lower pressure plate is fixed to the connecting plate by a vertically arranged connecting rod, and one of the connecting rods is located between the two limit members.

[0016] When clamping the wheel hub, a large clamping force is usually required. The upper driver is usually a pneumatic cylinder or an oil cylinder. If the device uses an oil cylinder, the oil cylinder includes a piston rod and a cylinder barrel. After long-term use, the piston rod of the device will rotate in the circumferential direction relative to the cylinder barrel of the oil cylinder. This rotation may cause the inflation tube to become entangled, and may also cause the angle of the air release valve to change and face the operator, causing danger during pressure release. By setting a limiter, the rotation of the upper pressure plate can be limited, thereby limiting the rotation of the piston rod, thereby reducing safety hazards.

[0017] Preferably, the limiting member is fixed on the upper pressing plate.

[0018] The upper pressure plate is an iron plate or a steel plate, and it is more reliable and safe to arrange the limiter on the upper pressure plate than on the pad.

[0019] Preferably, a safety detection sensor is provided at a position between the upper pressing plate and the lower pressing plate of the frame, and the safety detection sensor is electrically connected to the upper driver.

[0020] When the safety detection sensor detects the presence of an object, the cylinder does not work to prevent the upper and lower pressure plates from moving relative to each other and pressing the arms of the workers who are carrying the wheel hub workpiece.

[0021] The utility model has the advantages of improving the safety factor and reducing potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the utility model.

[0023] Figure 2It is a structural schematic diagram of the upper pressing plate and the lower pressing plate of the utility model.

[0024] Figure 3 It is a structural schematic diagram of the upper pressing plate and the lower pressing plate of the utility model.

[0025] Figure 4 It is a partial cross-sectional view of the upper pressure plate and the pad.

[0026] Figure numbers: frame 1, connecting plate 11, connecting rod 12, upper driver 2, piston rod 21, first joint 211, water tank 3, safety detection sensor 4, upper pressure plate 51, pad 52, fixing part 53, first section 531, second section 532, first fastener 54, second fastener 55, lower pressure plate 6, pressure relief valve 7, air pressure detector 8, second joint 81, three-way valve 82, limiter 9. DETAILED DESCRIPTION

[0027] The utility model is further described below based on the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 3 As shown, this embodiment discloses a hub air tightness detection mechanism with an upper pressing plate and a pad fixing structure, including a frame 1, an upper driver 2 and a water tank 3 are respectively provided at the upper and lower ends of the frame 1, and a lower driver (not shown in the figure) is provided below the water tank 3. The piston rod of the lower driver extends upward and is connected to the water tank 3, so that the water tank 3 can be lifted and lowered. A horizontally arranged top plate (not shown in the figure) is provided at the upper end of the frame 1, the upper driver 2 is fixed on the top plate, the piston rod 21 of the upper driver 2 passes through the top plate downward, and an upper pressing plate 51 is fixed at the lower end of the piston rod 21. A connecting plate 11 is fixed on the housing of the upper driver 2, the upper pressing plate 51 and the lower pressing plate 6 are both located at the lower side of the connecting plate 11, the width of the upper pressing plate 51 is smaller than the width of the connecting plate 11 and the lower pressing plate 6, and the lower pressing plate 6 is fixed by a vertically arranged connecting rod 12, and three annular connecting rods 12 are arranged evenly at intervals at the lower end of the connecting plate 11. The frame 1 is also provided with two safety detection sensors 4 spaced apart from each other. The two safety detection sensors 4 are located at the front sides of the upper pressure plate 51 and the lower pressure plate 6. When the operator needs to place or remove the hub workpiece, the operator's hands will pass between the two safety detection sensors 4.

[0029] Wherein, the upper pressing plate 51 is made of iron material, and the pad 52 is made of polyurethane material. Wherein, the upper end of the lower pressing plate 6 is also provided with a pad made of polyurethane material, and the pad on the lower pressing plate 6 can be directly threadedly fixed by vertical screws.

[0030] like Figures 1 to 4As shown, the upper pressing plate 51 is connected to the piston rod 21, and the lower end of the upper pressing plate 51 is provided with a pad 52 for contacting the wheel hub. The upper pressing plate 51 and the pad 52 are fixed by six or more fixing members 53 arranged in a ring shape and uniformly spaced with the center of the pressing plate 51 as the center of the circle. The fixing member 53 includes a first section 531 extending horizontally and a second section 532 extending vertically. The first section 531 and the second section 532 are connected and form an "L" shape; the first section 531 contacts the upper end surface of the upper pressing plate 51, and the second section 532 contacts the circumferential side wall of the upper pressing plate 51 and the pad 52; the upper end of the upper pressing plate 51 is provided with an upper fixing hole opening upward, and the upper fixing hole is a threaded hole (not marked in the figure), and the first fastener 54 passes through the first section 531 and is threadedly matched with the upper fixing hole. The circumferential side wall of the pad 52 is provided with a side fixing hole (not marked in the figure) extending radially along the pad 52, and the second fastener 55 passes through the second section 532 and is tightly matched with the side fixing hole. The second fastener 55 is a positioning pin.

[0031] like Figure 2 As shown, two limit members 9 extending radially along the upper pressure plate 51 are provided on the circumferential side wall of the upper pressure plate 51. The two limit members 9 are screws. The two limit members 9 are respectively located on the clockwise side and the counterclockwise side of a connecting rod 12. The limit members 9 can limit the rotation of the upper pressure plate 51 in the circumferential direction.

[0032] like Figure 2 and Figure 3 As shown, the lower end of the piston rod 21 and the interior of the upper pressure plate 51 are provided with a gas passage (not shown) connected to the gas charging tube (not shown in the figure), the pad 52 is provided with an air outlet (not shown in the figure) connected to the gas passage, and the circumferential side wall of the piston rod 21 is provided with a first joint 211, and the first joint 211 is fixed with a gas charging tube (not shown in the figure) connected to the gas passage. An air pressure detector 8 is fixed on the connecting plate 11, and the second joint 81 of the air pressure detector 8 is exposed downward at the lower end of the connecting plate 11. A three-way valve 82 is provided on the connecting plate 11, and the gas charging tube is connected to the three-way valve 82, and the other two valve ports of the three-way valve 82 are respectively connected to the second joint 81 and the first joint 211. A relief valve 7 is provided on the circumferential side wall of the piston rod 21, and the pressure relief valve 7 is connected to the gas passage.

[0033] When the wheel hub is tested for air tightness, the operator places the wheel hub on the lower pressure plate 6, and then the upper driver 2 drives the piston rod 21 to descend, so that the pad 52 presses the wheel hub, and then the water tank rises through the drive of the lower driver, so that the wheel hub is immersed in water. Then the inflation tube starts to inflate, and the high-pressure gas enters the inner cavity of the wheel hub through the gas channel. The operator observes the air pressure detector 8 and adjusts the air pressure in the inner cavity of the wheel hub through the pressure relief valve 7. After that, the operator observes whether there are bubbles generated at the compression point between the wheel hub and the upper pressure plate 51 and the lower pressure plate 6, so as to judge whether the air tightness of the wheel hub is good.

Claims

1. A wheel hub air tightness detection mechanism with an upper pressing plate and a backing plate fixing structure, wherein the backing plate is fixed to the lower end surface of the upper pressing plate, the upper pressing plate is provided with a gas passage connected to an inflation tube, and the backing plate is provided with an air outlet hole connected to the gas passage, characterized in that: A plurality of fixing parts are fixed at the outer edge of the upper end surface of the upper pressure plate, and the fixing parts have a first section located on the upper side of the upper pressure plate and a second section located on the circumferential outer side of the upper pressure plate, and the side wall of the second section is in contact with the circumferential side wall of the upper pressure plate and the circumferential side wall of the pad, and the upper pressure plate is provided with an upper fixing hole opening vertically upward, and the side wall of the pad is provided with a side fixing hole opening laterally, and the fixing parts are fixed to the upper fixing holes by first fasteners, and the fixing parts have second fasteners for extending into the side fixing holes.

2. The upper pressure plate and backing plate fixing structure for the hub air tightness detection mechanism according to claim 1 is characterized in that: The side fixing hole of the backing plate extends in the radial direction of the backing plate.

3. The upper pressure plate and backing plate fixing structure for the hub air tightness detection mechanism according to claim 1, characterized in that: At least three fixing members are arranged in a ring shape and evenly spaced on the upper pressing plate.

4. The upper pressure plate and backing plate fixing structure for the hub air tightness detection mechanism according to claim 1, characterized in that: The second fastener is tightly fitted in the side fixing hole.

5. A wheel hub air tightness detection mechanism having an upper pressing plate and a pad fixing structure for a wheel hub air tightness detection mechanism as claimed in any one of claims 1 to 4, comprising a frame, a water tank, the upper pressing plate, a lower pressing plate for supporting a workpiece, and an upper driver for driving the upper pressing plate to rise and fall, the water tank being equipped with a lower driver for positioning the lower pressing plate in the water tank, characterized in that: The inflation tube is connected with an air pressure detector and is equipped with a pressure relief valve.

6. The wheel hub air tightness detection mechanism according to claim 5, characterized in that: The upper pressure plate or pad has two limit members arranged side by side and extending outward. A connecting plate is fixed on the shell of the upper driver. The upper pressure plate and the lower pressure plate are both located on the lower side of the connecting plate. The width of the upper pressure plate is smaller than the width of the connecting plate and the lower pressure plate. The lower pressure plate is fixed to the connecting plate by a vertically arranged connecting rod, and one of the connecting rods is located between the two limit members.

7. The wheel hub air tightness detection mechanism according to claim 6, characterized in that: The limiting member is fixed on the upper pressing plate.

8. The wheel hub air tightness detection mechanism according to claim 5, characterized in that: The frame is provided with a safety detection sensor at a position corresponding to the upper pressing plate and the lower pressing plate, and the safety detection sensor is electrically connected to the upper driver.

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