A bush press fitting device

Abstract

The utility model discloses a bushing press -fitting device belongs to water pump production technical field, including organism, the hydraulic telescopic link of installation is provided with on the organism, the output shaft fixed setting of hydraulic telescopic link has the press bar, the bottom fixed setting of press bar has the connecting column, the bottom setting of connecting column has the concentric expansion mechanism, and the outer surface of connecting column is equipped with the press cylinder. The utility model discloses when using, through hydraulic telescopic link drive press bar moves down, and press bar passes through connecting column and promotes the concentric expansion mechanism to move down and enters the bushing, so that the concentric expansion mechanism generates the movement of moving down relative to the press cylinder, so that the concentric expansion mechanism generates radial expansion, and the inside wall of bushing forms the radial support, and then makes the bushing keep the vertical state, and press bar promotes the press cylinder and move down, and the press cylinder promotes the bushing and move down, so that the bushing enters the axle hole of pump shell, until the bushing is pressed into the axle hole of pump shell with the completely vertical posture, reaches the purpose that improves the assembly efficiency and assembly quality.

Description

Technical Field

[0001] This utility model relates to a pressing device, and more particularly to a bushing pressing device. Background Technology

[0002] In the water pump manufacturing process, after the back cover and volute of the water pump are fixed with bolts, the impeller shaft of the water pump passes through the center hole of the back cover and is connected to the output shaft of the motor through a coupling. A bushing, also known as a shaft sleeve, needs to be pre-pressed into the center hole of the back cover. The function of the shaft sleeve is to provide support for the impeller shaft and to rotate relative to the impeller shaft. The bushing has oil grooves and oil holes to achieve the purpose of lubrication when the impeller shaft rotates.

[0003] In existing bushing pressing processes, bushing pressing machines are specialized equipment for bushing pressing. These machines are pneumatically powered, vertically oriented, and manually controlled. During operation, the pump back cover is manually placed on the worktable, and then the bushing is placed on the shaft hole of the back cover. Because the bushing and shaft hole have an interference fit, the operator needs to hold the bushing by hand to ensure it is vertical. Then, the pressing machine is started, causing the press head to press down on the bushing, pressing it into the shaft hole of the back cover, completing the bushing pressing. The operator can remove their hand initially after the bushing is pressed into the shaft hole. However, this operation is somewhat dangerous, and when the operator holds the bushing, the verticality of the bushing cannot be guaranteed. At the beginning of pressing the bushing into the shaft hole, the edges of the bushing and shaft hole are easily subjected to hard impact, causing bushing deformation or gaps in the shaft hole.

[0004] A search revealed patent number CN107097170A, which provides a bushing pressing device, including a base, a U-shaped support base installed in the middle of the base, a vertical frame installed on the left side of the support base, a rotating shaft installed in the middle of the support base, a bearing connected to the support base at the bottom end of the rotating shaft, a support plate fixedly connected to the upper end of the rotating shaft, a turbine and a worm gear matching the turbine in the middle of the rotating shaft, two through holes at both ends of the support plate, a groove matching the bottom end of the workpiece in the middle of the support plate, and a limit block installed on the side of the groove, a cylinder installed at the upper end of the vertical frame, a stepped stamping shaft fixedly connected to the front end of the cylinder piston rod, the stamping shaft being divided into a connecting part, a thrust part and a working part from top to bottom; and a mold set below the stamping shaft, with a machining hole matching the workpiece in the middle of the mold.

[0005] The above solution requires placing a mold on the back cover to position the verticality of the bushing. However, the size of the mold cannot accommodate bushings of different diameters. Each time the model is changed, the mold needs to be changed, which is troublesome and increases the manufacturing cost of the mold. Utility Model Content

[0006] The purpose of this invention is to provide a bushing pressing device with the function of automatically calibrating the verticality of the bushing, which effectively solves the problem of bushing deformation or gaps in shaft holes in the prior art.

[0007] The present invention adopts the following technical solution: a bushing pressing device, including a machine body, a hydraulic telescopic rod installed on the machine body, a pressure rod fixedly installed on the output shaft of the hydraulic telescopic rod, a connecting column fixedly installed at the bottom end of the pressure rod, a concentric expansion mechanism installed at the bottom end of the connecting column, a pressure cylinder sleeved on the outer surface of the connecting column, and the concentric expansion mechanism hinged to the pressure cylinder; when the concentric expansion mechanism and the pressure cylinder move up and down relative to each other, the concentric expansion mechanism generates radial contraction or expansion.

[0008] Furthermore, the concentric expansion mechanism includes a number of support claws that are evenly arranged along the circumference and hinged to the pressure cylinder. The bottom end of the connecting column is provided with a driving device located between the multiple support claws. When the driving device moves up and down relative to the pressure cylinder, it drives the bottom end of each support claw to rotate synchronously inward or outward.

[0009] Furthermore, the driving device includes a driving block, and the driving block is evenly hinged with connecting rods corresponding to the support claws along the circumferential direction. The bottom end of each connecting rod is hinged to the lower part of the support claw. The bottom end of the connecting column can drive the driving block to move up and down.

[0010] Furthermore, a pressure spring is fixedly installed between the bottom end of the drive block and the connecting column.

[0011] Furthermore, a disc is fixedly installed at the bottom of the connecting column, and the lower end face of the disc is fixedly installed with the top end of the pressure spring. The disc is slidably installed inside the pressure cylinder in the vertical direction.

[0012] Furthermore, the upper surface of the drive block is provided with several mounting slots evenly distributed radially, and the top end of the connecting rod is located in the corresponding mounting slot and hinged to the drive block.

[0013] Furthermore, each of the support claws has a through groove on its outer side, and the bottom end of the connecting rod is located in the through groove and hinged to the corresponding support claw.

[0014] Furthermore, the lower end face of the pressure cylinder is evenly provided with several rotating grooves along the vertical direction, and the top of the support claw is located in the corresponding rotating groove and hinged to the pressure cylinder.

[0015] Furthermore, the machine body includes two support columns and a crossbeam fixedly installed at the top of each of the two support columns, and a hydraulic telescopic rod is fixedly installed in the crossbeam in the vertical direction.

[0016] Furthermore, a workbench is fixedly installed between the two support columns, and a positioning column is fixedly installed on the upper surface of the workbench.

[0017] I. This utility model, by incorporating a hydraulic telescopic rod, a pressure rod, a connecting column, and a concentric expansion mechanism, operates as follows: The bushing is placed vertically at the shaft hole of the pump housing. The hydraulic telescopic rod then drives the pressure rod downwards. The pressure rod, via the connecting column, pushes the concentric expansion mechanism downwards into the bushing. As the pressure rod depresses, the lower end face of the pressure cylinder contacts the upper end face of the bushing. If the pressure rod continues to depress, the pressure cylinder is stopped from moving downwards by the bushing. The continued downward pressure causes the concentric expansion mechanism to move downwards relative to the pressure cylinder, resulting in radial expansion. The expansion mechanism provides radial support to the inner wall of the bushing, keeping it vertical. As the pressure rod continues to press down until its lower end contacts the upper end of the pressure cylinder, the pressure rod continues to press down, pushing the pressure cylinder downwards. The pressure cylinder then pushes the bushing downwards, causing it to enter the shaft hole of the pump housing. This process continues until the bushing is pressed into the shaft hole of the pump housing in a completely vertical position, completing the bushing installation. The concentric expansion mechanism calibrates the bushing to a vertical position without manual intervention, thus improving assembly efficiency and quality.

[0018] II. This utility model, by incorporating a drive block, connecting rod, and pressure spring, operates as follows: When the pressure rod is pressed down, the pressure spring pushes the drive block downward, causing each support claw to enter the bushing. When the lower end face of the pressure cylinder contacts the upper end face of the bushing, the connecting rod continues to move downward, compressing the pressure spring. The pressure spring forces the drive block to move downward, causing the bottom end of each support claw to rotate outward. When the bottom end of each support claw contacts the inner wall of the bushing, the pressure rod continues to press down, continuously compressing the pressure spring until the lower end face of the pressure rod contacts the upper end face of the pressure cylinder. At this point, the pressure rod pushes the pressure cylinder downward, pressing the bushing into the shaft hole of the pump housing, thus achieving the desired result. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall three-dimensional structure of this utility model; Figure 2 This is a three-dimensional structural diagram of the pressure bar of this utility model; Figure 3 This is a schematic diagram of the internal three-dimensional structure of the pressure cylinder in this utility model; Figure 4 This is a three-dimensional structural diagram of the bushing in this utility model.

[0020] In the diagram, 1. Hydraulic telescopic rod; 2. Pressure rod; 3. Connecting column; 4. Pressure cylinder; 5. Pump housing; 6. Bushing; 7. Shaft hole; 8. Support claw; 9. Drive block; 10. Connecting rod; 11. Pressure spring; 12. Disc; 13. Mounting groove; 14. Through groove; 15. Rotating groove; 16. Support column; 17. Crossbeam; 18. Worktable; 19. Positioning column. Detailed Implementation

[0021] Please see Figure 1-4 The present invention will now be described in detail with reference to the accompanying drawings and embodiments: The bushing pressing device of this utility model includes a machine body, on which a hydraulic telescopic rod 1 is installed. A pressure rod 2 is fixedly installed on the output shaft of the hydraulic telescopic rod 1. A connecting column 3 is fixedly installed at the bottom end of the pressure rod 2. A concentric expansion mechanism is installed at the bottom end of the connecting column 3. A pressure cylinder 4 is sleeved on the outer surface of the connecting column 3. The concentric expansion mechanism is hinged to the pressure cylinder 4. When the concentric expansion mechanism and the pressure cylinder 4 move up and down relative to each other, the concentric expansion mechanism will generate radial contraction or expansion. In use, the pump housing 5 is placed below the hydraulic telescopic rod 1, and the bushing 6 is placed in the shaft hole 7 of the pump housing 5. Then, the hydraulic telescopic rod 1 extends, driving the pressure rod 2 to move downward. The pressure rod 2 pushes the concentric expansion mechanism downward through the connecting column 3, so that the concentric expansion mechanism enters the bushing 6. As the pressure rod 2 presses down, the lower end face of the pressure cylinder 4 contacts the upper end face of the bushing 6. At this time, the pressure rod 2 continues to press down, and the pressure cylinder 4 is stopped from moving downward by the bushing 6. As the pressure rod 2 continues to press down, it drives the concentric expansion mechanism downward through the connecting column 3, causing the concentric expansion mechanism to move downward relative to the pressure cylinder 4. Since the pressure cylinder 4 is hinged to the concentric expansion mechanism, the concentric expansion mechanism expands radially, providing radial support to the inner wall of the bushing 6, thus keeping the bushing 6 vertical. As the pressure rod 2 continues to press down, the force of the concentric expansion mechanism against the inner wall of the bushing 6 increases until the lower end face of the pressure rod 2 contacts the upper end face of the pressure cylinder 4. At this point, the pressure rod 2 continues to press down, pushing the pressure cylinder 4 downward, which in turn pushes the bushing 6 downward, causing the bushing 6 to enter the shaft hole 7 of the pump housing 5. Since the pressure cylinder 4 and the pressure rod 2 are pressing down synchronously, they are relatively stationary, and the concentric expansion mechanism will not continue to expand until the bushing 6 is pressed into the shaft hole 7 of the pump housing 5 in a completely vertical position, completing the work of pressing the bushing 6 into the shaft hole 7 of the pump housing 5.

[0022] In this embodiment, the concentric expansion mechanism includes a plurality of support claws 8 evenly arranged along the circumference and hinged to the pressure cylinder 4. A driving device is located at the bottom end of the connecting column 3, situated between the support claws 8. When the driving device moves up and down relative to the pressure cylinder 4, it drives the bottom end of each support claw 8 to rotate synchronously inward or outward, achieving radial expansion or contraction. In use, the pressure rod 2 presses down, driving the concentric expansion mechanism and the pressure cylinder 4 to move downward synchronously via the connecting column 3. When the lower end face of the pressure cylinder 4 contacts the upper end face of the bushing 6, the pressure rod 2 continues to push the driving device downward. At this time, the driving device moves downward relative to the pressure cylinder 4, thereby causing the driving device to drive the bottom end of each support claw 8 to rotate outward. This causes the bottom end of each support claw 8 to contact the inner wall of the bushing 6. Since the support claws 8 rotate outward synchronously, the bushing 6 is adjusted to a vertical position. As the pressure continues to be applied, the drive device continues to drive the support claws 8 to rotate outward, increasing the force of the support claws 8 against the inner wall of the bushing 6. When the lower end face of the pressure rod 2 contacts the upper end face of the pressure cylinder 4, the pressure rod 2 pushes the pressure cylinder 4 downward, causing the pressure cylinder 4 to press down on the bushing 6, forcing the bushing 6 into the shaft hole 7 of the pump housing 5. When the pressure rod 2 pushes the pressure cylinder 4 downward, the drive device and the pressure cylinder 4 no longer move relative to each other, and the drive device no longer drives the bottom end of the support claw 8 to rotate outward, until the bushing 6 is completely pressed into the shaft hole 7 of the pump housing 5.

[0023] In this embodiment, the driving device includes a driving block 9, and the driving block 9 is evenly hinged with connecting rods 10 corresponding to the support claws 8 along the circumferential direction. The bottom end of each connecting rod 10 is hinged to the lower part of the support claw 8. The bottom end of the connecting column 3 can drive the driving block 9 to move downward. In use, the pressure rod 2 presses the driving block 9 downward through the connecting column 3. When the pressure cylinder 4 contacts the upper end surface of the bushing 6, the driving block 9 moves downward relative to the bushing 6. At this time, the driving block 9 drives the bottom end of each support claw 8 to rotate outward through the connecting rod 10.

[0024] In this embodiment, a pressure spring 11 is fixedly installed between the bottom end of the driving block 9 and the connecting column 3. When the pressure rod 2 presses down, the connecting column 3 pushes the driving block 9 downward through the pressure spring 11, causing each support claw 8 to enter the interior of the bushing 6. When the lower end face of the pressure cylinder 4 contacts the upper end face of the bushing 6, the connecting column 3 continues to move downward to compress the pressure spring 11. The pressure spring 11 forces the driving block 9 to move downward, and the driving block 9 drives the bottom end of each support claw 8 to rotate outward. When the bottom end of each support claw 8 contacts the inner wall of the bushing 6, the support claw 8 stops rotating. At this time, the lower end face of the pressure rod 2 has not yet contacted the upper end face of the pressure cylinder 4. The pressure rod 2 continues to press down, but the support claw 8 cannot rotate, causing the pressure spring 11 to be continuously compressed until the lower end face of the pressure rod 2 contacts the upper end face of the pressure cylinder 4. When spring 11 stops being compressed, pressure rod 2 pushes pressure cylinder 4 downward. Drive block 9 moves downward synchronously with pressure cylinder 4. Drive block 9 and pressure cylinder 4 are relatively stationary. Drive block 9 no longer drives support claw 8 to rotate outward. Pressure cylinder 4 presses down and presses bushing 6 into shaft hole 7 of pump housing 5. The function of setting pressure spring 11 is that when pressure cylinder 4 moves downward and contacts the upper end face of bushing 6, drive block 9 starts to move downward relative to pressure cylinder 4 and drives the bottom end of each support claw 8 to rotate outward. When each support claw 8 is in contact with the inner wall of bushing 6, causing support claw 8 to be unable to rotate, connecting column 3 can still continue to move downward, but it further compresses pressure spring 11. As a result, the force of support claw 8 against inner wall of bushing 6 increases. Until the lower end face of pressure rod 2 contacts the upper end face of pressure cylinder 4, pressure spring 11 stops being compressed.

[0025] In this embodiment, a disc 12 is fixedly installed at the bottom end of the connecting column 3. The lower end face of the disc 12 is fixedly installed with the top end of the pressure spring 11. The disc 12 is slidably installed in the pressure cylinder 4 in the up-down direction. When the pressure rod 2 presses down and drives the connecting column 3 to move downward, it drives the disc 12 to slide downward in the pressure cylinder 4, which increases the stability of the connecting column 3 sliding up and down relative to the pressure cylinder 4.

[0026] In this embodiment, the upper end face of the drive block 9 is provided with a plurality of mounting grooves 13 evenly arranged in the radial direction, and the top end of the connecting rod 10 is located in the corresponding mounting groove 13 and hinged to the drive block 9; the mounting grooves 13 increase the range of rotation of the connecting rod 10 and reduce the overall size.

[0027] In this embodiment, each support claw 8 has a through groove 14 on its outer side, and the bottom end of the connecting rod 10 is located in the through groove 14 and is hinged to the corresponding support claw 8.

[0028] In this embodiment, the lower end face of the pressure cylinder 4 is evenly provided with a plurality of rotating grooves 15 along the vertical direction, and the top of the support claw 8 is located in the corresponding rotating groove 15 and is hinged to the pressure cylinder 4.

[0029] In this embodiment, the machine body includes two support columns 16 and a crossbeam 17 fixedly installed at the top of each of the two support columns 16. The hydraulic telescopic rod 1 is fixedly installed in the crossbeam 17 in the vertical direction.

[0030] In this embodiment, a workbench 18 is fixedly arranged between the two support columns 16, and a positioning column 19 is fixedly arranged on the upper surface of the workbench 18. The positioning column 19 is used to position the pump housing 5.

[0031] The working principle of this utility model is as follows: First, the pump housing 5 is placed on the workbench 18 and positioned by the positioning column 19. Then, the hydraulic telescopic rod 1 is pressed down to drive the pressure rod 2 downward. The connecting column 3 pushes the drive block 9 downward through the pressure spring 11, so that each support claw 8 enters the interior of the bushing 6. When the lower end face of the pressure cylinder 4 contacts the upper end face of the bushing 6, the connecting column 3 continues to move downward to compress the pressure spring 11. The pressure spring 11 forces the drive block 9 to move downward. The drive block 9 drives the bottom end of each support claw 8 to rotate outward through the connecting rod 10, so that the bottom end of each support claw 8 contacts the inner wall of the bushing 6, until the lower end face of the pressure rod 2 contacts the upper end face of the pressure cylinder 4. The pressure spring 11 stops being compressed. At this time, the pressure rod 2 pushes the pressure cylinder 4 downward, and the drive block 9 moves downward synchronously. The pressure cylinder 4 presses the bushing 6 into the shaft hole 7 of the pump housing 5, thus completing the purpose of pressing the bushing 6 into the shaft hole 7 of the pump housing 5.

Claims

1. A bushing pressing device, characterized in that: The machine body is equipped with a hydraulic telescopic rod (1), and a pressure rod (2) is fixedly installed on the output shaft of the hydraulic telescopic rod (1). A connecting column (3) is fixedly installed at the bottom end of the pressure rod (2). A concentric expansion mechanism is installed at the bottom end of the connecting column (3). A pressure cylinder (4) is sleeved on the outer surface of the connecting column (3). The concentric expansion mechanism is hinged to the pressure cylinder (4). When the concentric expansion mechanism and the pressure cylinder (4) move up and down relative to each other, the concentric expansion mechanism will generate radial contraction or expansion.

2. The bushing pressing device according to claim 1, characterized in that: The concentric expansion mechanism includes several support claws (8) that are evenly arranged along the circumference and hinged to the pressure cylinder (4). The bottom end of the connecting column (3) is provided with a driving device located between the multiple support claws (8). When the driving device moves up and down relative to the pressure cylinder (4), it drives the bottom end of each support claw (8) to rotate synchronously inward or outward.

3. The bushing pressing device according to claim 2, characterized in that: The driving device includes a driving block (9), which is evenly hinged with connecting rods (10) corresponding to the support claws (8) along the circumferential direction. The bottom end of each connecting rod (10) is hinged to the lower part of the support claws (8). The bottom end of the connecting column (3) can drive the driving block (9) to move up and down.

4. The bushing pressing device according to claim 3, characterized in that: A pressure spring (11) is fixedly installed between the bottom end of the drive block (9) and the connecting column (3).

5. The bushing pressing device according to claim 4, characterized in that: The bottom end of the connecting column (3) is fixedly provided with a disc (12), the lower end face of the disc (12) is fixedly provided with the top end of the pressure spring (11), and the disc (12) is slidably provided in the pressure cylinder (4) in the up and down direction.

6. The bushing pressing device according to claim 3, characterized in that: The upper end face of the drive block (9) is provided with several mounting grooves (13) evenly arranged in the radial direction, and the top end of the connecting rod (10) is located in the corresponding mounting groove (13) and hinged to the drive block (9).

7. The bushing pressing device according to claim 3, characterized in that: Each of the support claws (8) has a through groove (14) on its outer side, and the bottom end of the connecting rod (10) is located in the through groove (14) and hinged to the corresponding support claw (8).

8. The bushing pressing device according to claim 2, characterized in that: The lower end face of the pressure cylinder (4) is evenly provided with several rotating grooves (15) in the vertical direction, and the top of the support claw (8) is located in the corresponding rotating groove (15) and is hinged to the pressure cylinder (4).

9. The bushing pressing device according to claim 1, characterized in that: The machine body includes two support columns (16) and a crossbeam (17) fixedly installed at the top of the two support columns (16). The hydraulic telescopic rod (1) is fixedly installed in the crossbeam (17) in the vertical direction.

10. The bushing pressing device according to claim 1, characterized in that: A workbench (18) is fixedly installed between the two support columns (16), and a positioning column (19) is fixedly installed on the upper surface of the workbench (18).

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