Bidirectional press fitting device for hub bolts

Abstract

The utility model discloses a bidirectional press-fitting device for hub bolts. The bidirectional press-fitting device comprises a forward press-fitting device and a reverse press-fitting device, the forward press-fitting device comprises a power part I and a C-shaped pressing block I; a C-shaped pressing block I and a power component I are assembled together, a bottom plate of the C-shaped pressing block I abuts against an upper flange structure I of a hub, a telescopic rod I of the power component I penetrates through a top plate of the C-shaped pressing block I and then acts on an upper-layer hub bolt, and the upper-layer hub bolt is subjected to press fitting from top to bottom. The reverse press-fitting device comprises a power part II, a C-shaped pressing block II and a pressing seat, the C-shaped pressing block II and the power part II are assembled together, a bottom plate of the C-shaped pressing block II abuts against an upper flange structure II after the hub is turned over by 180 degrees, a telescopic rod II of the power part II penetrates through a top plate of the C-shaped pressing block II and then acts on the pressing seat, and the telescopic rod II is connected with the pressing seat. And the lower-layer hub bolt is subjected to press fitting from bottom to top. The technical problems of press fitting of hub bolts on a large hub of an existing heavy mine car and reverse press fitting of the hub bolts when the space of the large hub of the heavy mine car is limited are solved.

Description

Technical Field

[0001] The utility model relates to a two-way press-fit device for a wheel hub bolt, belonging to the technical field of heavy-duty mine wheel hub bolt installation tools. Background Art

[0002] The wheel hub bolts are important components for connecting wheels. The interference fit between the wheel hub bolts and the shaft and hole of the wheel hub is relatively large. At present, the engineering machinery industry mainly adopts the press installation method: the wheel hub bolts are pre-installed on the wheel hub, the wheel hub is supported by a rotary tooling, the wheel hub is rotated, and the wheel hub bolts are adjusted to be directly below the pressure head of the press. The press is started to make the pressure head press the wheel hub bolts, and the wheel hub is rotated in sequence until a circle of wheel hub bolts are pressed.

[0003] The wheel hubs of some heavy-duty mining vehicles are designed with upper and lower layers of wheel hub bolts. The existing technology in the industry is to press-fit the upper wheel hub bolts (from top to bottom). The lower wheel hub bolts cannot be press-fitted due to vertical dimension interference and limited operating space. They can only be installed manually with copper rods. Manual operation has low efficiency and high labor intensity. Summary of the invention

[0004] In order to solve the problem of press-fitting the upper and lower layers of wheel hub bolts in the existing wheel hub, the upper layer of wheel hub bolts are press-fitted in the forward direction, while the lower layer of wheel hub bolts must be press-fitted in the reverse direction (from bottom to top) due to vertical dimension interference and limited operating space. It is now necessary to design a bidirectional press-fitting device suitable for heavy-duty mining wheel hub bolts.

[0005] The utility model is implemented according to the following technical solutions:

[0006] A two-way press-fitting device for wheel hub bolts comprises a forward press-fitting device and a reverse press-fitting device; the forward press-fitting device comprises a power component I and a C-type press block I; the power component I comprises a telescopic rod I for linear motion; the C-type press block I is assembled together with one end of the power component I close to the telescopic rod I, the bottom plate of the C-type press block I is pressed on the upper flange structure I of the wheel hub, the telescopic rod I passes through the top plate of the C-type press block I and acts on the upper wheel hub bolts, and the upper wheel hub bolts are press-fitted from top to bottom; the reverse press-fitting device comprises a power component II, a C-type press block II and a press seat, the power component II comprises a telescopic rod II for linear motion; the C-type press block II is assembled together with one end of the power component II close to the telescopic rod II, the bottom plate of the C-type press block II is pressed on the upper flange structure II after the wheel hub is turned 180 degrees, the telescopic rod II passes through the top plate of the C-type press block II and acts on the press seat, and the lower wheel hub bolts are press-fitted from bottom to top.

[0007] In some embodiments, a through hole through which the telescopic rod I can pass is provided at the center of the top plate of the C-type pressure block I, and a circle of evenly spaced threaded holes is provided around the through hole. The fixed portion of the power component I is close to one end of the C-type pressure block I and is provided with a plurality of mounting holes corresponding to the threaded holes one by one, and the power component I is connected to the C-type pressure block I by a plurality of bolts.

[0008] In some embodiments, an outwardly protruding U-shaped groove is provided in the middle of the bottom plate of the C-shaped pressing block I, and the upper wheel hub bolts can pass through the middle of the U-shaped groove when being pressed downward by the telescopic rod I.

[0009] In some embodiments, when the upper wheel hub bolt is pressed into the fitted wheel hub, the distance from the upper end surface of the upper wheel hub bolt to the lower end surface of the upper flange structure I is H1, the inner size of the C-type pressing block I is C1, the top plate thickness of the C-type pressing block I is D1, and the stroke of the telescopic rod I is L1, which needs to satisfy L1>C1+D1-H1.

[0010] In some embodiments, a through hole through which the telescopic rod II can pass is provided at the center of the top plate of the C-type pressure block II, and a circle of evenly spaced threaded holes is provided around the through hole. A plurality of mounting holes corresponding to the threaded holes are provided at one end of the fixing portion of the power component II close to the C-type pressure block II, and the power component II is connected to the C-type pressure block II by a plurality of bolts.

[0011] In some embodiments, a protrusion is provided in the middle of the bottom plate of the C-shaped pressing block II, and when the telescopic rod II is pressed downward, the protrusion pushes the lower wheel hub bolt to move upward.

[0012] In some embodiments, the pressure seat is a box-type structure consisting of a flat plate at the top, a C-shaped plate in the middle, and a U-shaped groove plate at the bottom; the flat plate is in contact with the telescopic rod II, and when the pressure seat is pressed downward by the telescopic rod II, the lower wheel hub bolts are inserted into the C-shaped plate through the U-shaped groove.

[0013] In some embodiments, the lower wheel hub bolts are first pre-installed on the wheel hub, and the distance from the lower end face of the lower wheel hub bolts to the upper end face of the upper flange structure II is H2, the inner size of the C-type pressure block II is C2, and the height of the pressure seat is L2, which needs to satisfy C2>H2+L2; when the lower wheel hub bolts are pressed into the fitting wheel hub, the length of the lower wheel hub bolts leaking out from the upper flange structure II is L4, and the height from the bottom surface of the pressure seat to the top surface of the inner cavity of the pressure seat is L3, which needs to satisfy L3>L4.

[0014] In some embodiments, the power component I and the power component II are both hydraulic cylinders, and a hydraulic cylinder oil return joint and a hydraulic cylinder oil inlet joint are provided on the cylinder body; the hydraulic cylinder oil return joint is connected to the return oil pipeline of the external hydraulic pump station, and the hydraulic cylinder oil inlet joint is connected to the oil inlet pipeline of the external hydraulic pump station.

[0015] In some embodiments, the C-type pressing block I and the C-type pressing block II are integral forgings.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a two-way press-fit device for wheel hub bolts, namely, a forward press-fit device for wheel hub bolts and a reverse press-fit device for wheel hub bolts. The two-way press-fit device is a modular structure during assembly. Without investing in large-scale press-fit equipment, the forward press-fit of wheel hub bolts is realized through hydraulic cylinders, C-type press blocks I and hydraulic pump stations, and the reverse press-fit of wheel hub bolts is realized through hydraulic cylinders, C-type press blocks II, press seats and hydraulic pump stations.

[0018] The invention solves the technical problems of press-fitting hub bolts on the large wheel hub of the existing heavy mining car and reverse press-fitting hub bolts when the large wheel hub space of the heavy mining car is limited. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0020] In the attached picture:

[0021] Figure 1 This is a schematic diagram of the application of the forward press-fitting device of the utility model;

[0022] Figure 2 It is a dimensionally marked schematic diagram of the forward press-fitting device of the utility model;

[0023] Figure 3 This is a schematic diagram of the C-type pressing block I of the utility model;

[0024] Figure 4 This is a schematic diagram of the application of the reverse press-fitting device of the utility model;

[0025] Figure 5 It is a dimensionally marked schematic diagram of the reverse press-fitting device of the utility model;

[0026] Figure 6 This is a schematic diagram of the C-type pressing block II of the utility model;

[0027] Figure 7 It is a schematic diagram of dimension marking of the pressure seat of the utility model;

[0028] Figure 8 It is a schematic diagram of the pressure seat of the utility model;

[0029] Fig. 9 The figure is a working schematic diagram of the bidirectional press-fitting device for wheel hub bolts of the utility model (a is a forward press-fitting device, and b is a reverse press-fitting device).

[0030] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 1 , Figure 4As shown, a two-way press-fitting device for wheel hub bolts comprises a forward press-fitting device and a reverse press-fitting device; the forward press-fitting device comprises a power component Ⅰ1-4 and a C-type pressing block Ⅰ1-1; the power component Ⅰ has a telescopic rod Ⅰ that moves linearly; the C-type pressing block Ⅰ1-1 is assembled with an end of the power component Ⅰ1-4 close to the telescopic rod Ⅰ, the bottom plate of the C-type pressing block Ⅰ1-1 is pressed on the upper flange structure Ⅰ of the wheel hub 300, and the telescopic rod Ⅰ passes through the top plate of the C-type pressing block Ⅰ1-1 and acts on the upper wheel hub bolt 100, so as to press the upper wheel hub bolt 100 from top to bottom; the reverse press-fitting device comprises a power component Ⅱ2-5, a C-type pressing block Ⅱ2-1 and a pressing seat 2-2, and the power component Ⅱ2-5 has a telescopic rod Ⅱ that moves linearly; The C-type pressing block Ⅱ2-1 is assembled with one end of the power component Ⅱ2-5 close to the telescopic rod Ⅱ. The bottom plate of the C-type pressing block Ⅱ2-1 is pressed on the upper flange structure Ⅱ after the wheel hub 300 is flipped 180 degrees. The telescopic rod Ⅱ passes through the top plate of the C-type pressing block Ⅱ2-1 and acts on the pressure seat 2-2 to press the lower wheel hub bolt 200 from bottom to top.

[0035] The above-mentioned forward press-fitting device is further described below.

[0036] like Figure 1 As shown, the power component Ⅰ1-4 is a hydraulic cylinder, and a hydraulic cylinder oil return joint 1-2 and a hydraulic cylinder oil inlet joint 1-5 are provided on its cylinder body; the hydraulic cylinder oil return joint 1-2 is connected to the return oil pipeline of the external hydraulic pump station, and the hydraulic cylinder oil inlet joint 1-5 is connected to the oil inlet pipeline of the external hydraulic pump station.

[0037] like Figure 3 As shown, a through hole is provided at the center of the top plate of the C-type pressing block Ⅰ1-1, through which the telescopic rod Ⅰ can pass, and a circle of threaded holes is provided around the through hole at uniform intervals. The end of the cylinder body of the power component Ⅰ1-4 close to the C-type pressing block Ⅰ1-1 is provided with multiple mounting holes corresponding to the threaded holes one by one, and the power component Ⅰ1-4 is connected to the C-type pressing block Ⅰ1-1 by multiple bolts 1-3. A convex U-shaped groove is provided in the middle of the bottom plate of the C-type pressing block Ⅰ1-1, and the upper wheel hub bolt 100 can pass through the middle of the U-shaped groove when being pressed downward by the telescopic rod Ⅰ to avoid interference.

[0038] Further solutions, such as Figure 2 As shown, when the upper wheel hub bolt 100 is pressed into the fitting wheel hub 300, the distance from the upper end face of the upper wheel hub bolt 100 to the lower end face of the upper flange structure I is H1, the inner size of the C-type pressing block I is C1, the top plate thickness of the C-type pressing block I is D1, and the stroke of the telescopic rod I is L1; when selecting the hydraulic cylinder and designing the C-type pressing block I1-1, in order to ensure that the upper wheel hub bolt 100 is pressed into the bottom within the stroke range of the hydraulic cylinder, it is necessary to satisfy L1>C1+D1-H1.

[0039] A further solution is that the C-type pressing block Ⅰ1-1 is an integral forging, which is finely processed after tempering treatment and finally quenched at 52-60HRC to ensure the strength requirements and avoid severe deformation during the pressing process.

[0040] The above-mentioned reverse press-fitting device is further described below.

[0041] like Figure 4 As shown, the power component II 2-5 is a hydraulic cylinder, and a hydraulic cylinder return oil joint 2-3 and a hydraulic cylinder oil inlet joint 2-6 are provided on the cylinder body; the hydraulic cylinder return oil joint 2-3 is connected to the return oil pipeline of the external hydraulic pump station, and the hydraulic cylinder oil inlet joint 2-6 is connected to the oil inlet pipeline of the external hydraulic pump station.

[0042] like Figure 6 As shown, a through hole is provided at the center of the top plate of the C-type pressing block II2-1, into which the telescopic rod II can be inserted, and a circle of threaded holes is provided around the through hole at uniform intervals. The end of the cylinder of the power component II close to the C-type pressing block II2-1 is provided with a plurality of mounting holes corresponding to the threaded holes one by one, and the power component II2-5 is connected to the C-type pressing block II2-1 by a plurality of bolts 2-4. A convex block is provided in the middle of the bottom plate of the C-type pressing block II2-1, and when the telescopic rod II is pressed downward, the convex block pushes the lower wheel hub bolt 200 to move upward.

[0043] Further solutions, such as Figure 8 As shown, the pressure seat 2-2 is a box-type structure consisting of a flat plate at the top, a C-shaped plate in the middle and a U-shaped groove plate at the bottom; the flat plate is in contact with the telescopic rod II, and when the pressure seat 2-2 is pressed downward by the telescopic rod II, the lower wheel hub bolt 200 penetrates into the C-shaped plate through the U-shaped groove.

[0044] It should be noted that the upper plate and the lower plate of the pressure seat 2-2 are milled after welding to ensure parallelism, so as to ensure that the C-type pressure block II 2-1 can be in plane contact when pressing the wheel hub bolt to avoid deviation.

[0045] Further solutions, such as Figure 5 As shown, the lower wheel hub bolt 200 is first pre-installed on the wheel hub 300, the distance from the lower end face of the lower wheel hub bolt 200 to the upper end face of the upper flange structure II is H2, the inner size of the C-type pressure block II2-1 is C2, and the height of the pressure seat 2-1 is L2. When designing the sizes of the C-type pressure block II2-1 and the pressure seat 2-2, in order to ensure that after the lower wheel hub bolt 200 is pre-installed on the wheel hub 300, the reverse pressing device can be adapted to the wheel hub size, that is, the C-type pressure block II2-1 can press on the rim bolt without interference, it is necessary to satisfy C2>H2+L2.

[0046] When the C-type pressing block II2-1 presses the lower wheel hub bolt 200, the lower wheel hub bolt 200 passes through the lower U-shaped groove of the pressing seat 2-2 until it fits with the wheel hub 300. At this time, the lower wheel hub bolt 200 is exposed by a length of L4; the height from the bottom surface of the pressing seat to the top surface of the pressing seat inner cavity is L3. In order to ensure that the lower wheel hub bolt 200 does not interfere with the pressing seat 2-2 when it is pressed and fitted to the wheel hub 300, L3>L4 needs to be satisfied.

[0047] A further solution is that the C-type pressing block Ⅱ2-1 is an integral forging, which is fine-machined after tempering treatment and finally quenched at 52-60HRC to ensure the strength requirements and avoid severe deformation during the pressing process.

[0048] The following is combined with Fig. 9 As shown, the working principles of the above-mentioned forward press-fitting device and reverse press-fitting device are given.

[0049] 1. Working principle of positive press-fitting of upper wheel hub bolts:

[0050] The upper wheel hub bolt 100 needs to be pressed using a forward pressing device. The upper wheel hub bolt 400 is pre-installed on the wheel hub 300, and the forward pressing device is hoisted near the upper wheel hub bolt 100. The position of the C-type pressing block Ⅰ1-1 is adjusted so that its U-shaped groove is aligned with the upper wheel hub bolt hole. The hydraulic cylinder oil return joint 1-2 is connected to the hydraulic pump station oil return pipeline, and the hydraulic cylinder oil inlet joint 1-5 is connected to the hydraulic pump station oil inlet pipeline. The external hydraulic pump station is started, and the telescopic rod of the hydraulic cylinder is pushed out from the upper through hole of the C-type pressing block Ⅰ1-1, and the upper wheel hub bolt 100 is pressed until it fits with the wheel hub 300. A U groove is opened on the lower side of the C-type pressing block Ⅰ1-1, and the upper wheel hub bolt 100 can pass through the middle of the U groove when being pressed downward to avoid interference.

[0051] 2. Principle of reverse press-fitting of lower wheel hub bolts:

[0052] When the press-fitting or positive press-fitting of the lower hub bolts 200 is limited, a reverse press-fitting device needs to be used. After the positive press-fitting of the upper hub bolts 100 is completed, the wheel hub 300 is turned over 180°, that is, the lower hub bolts are headed downward. The lower wheel hub bolt 200 is pre-installed on the wheel hub 300 first, and the reverse pressing device is hoisted to the vicinity of the lower wheel hub bolt 200. The position of the C-type pressing block Ⅱ2-1 is adjusted so that its pressure head is aligned with the lower wheel hub bolt 200, and the position of the pressing seat 2-2 is adjusted so that its U-shaped groove is aligned with the lower wheel hub bolt 200. The hydraulic cylinder return oil joint 2-3 is connected to the return oil pipeline of the external hydraulic pump station, and the hydraulic cylinder oil inlet joint 2-6 is connected to the oil inlet pipeline of the hydraulic pump station. Start the hydraulic pump station, and the telescopic rod of the hydraulic cylinder is pushed out from the upper side through hole of the C-type pressing block Ⅱ2-1, and continues to tighten after it reaches the upper end surface of the pressing seat 2-2. When the hydraulic cylinder pressure is greater than the pressing resistance of the lower wheel hub bolt 200, the C-type pressing block Ⅱ2-1 starts to reverse, that is, press the lower wheel hub bolt 200 upward until it fits with the wheel hub 300. When the lower wheel hub bolt 200 is pressed upward, it can pass through the middle of the U-shaped groove of the pressing seat 2-2 to avoid interference.

[0053] In summary, the hub bolt bidirectional press-fitting device provided by the utility model has the following functions and advantages:

[0054] 1. The wheel hub bolt forward press-fitting (press-fitting from top to bottom) device and the wheel hub bolt reverse press-fitting (press-fitting from bottom to top) device can be used separately or in combination according to the wheel hub structure.

[0055] 2. Both the forward pressing device and the reverse pressing device for the wheel hub bolt are assembled modular structures. The hydraulic cylinder, C-type pressing block and pressing seat suitable for the stroke can be selected according to the size of the wheel hub and the wheel hub bolt for assembly.

[0056] 3. The upper wheel hub bolts are installed by a forward pressing device. There is a through hole on the upper side of the C-type pressing block I. The telescopic rod of the hydraulic cylinder can be pushed out from the through hole to press the upper wheel hub bolts. A U-shaped groove is opened on the lower side of the C-type pressing block I. When the upper wheel hub bolts are pressed downward by the telescopic rod of the hydraulic cylinder, they can pass through the middle of the U-shaped groove to avoid interference.

[0057] 4. The lower wheel hub bolts are installed with a reverse pressing device. There is a through hole on the upper side of the C-type pressing block II. The telescopic rod of the hydraulic cylinder can be pushed out from the through hole to press the pressing seat. The two sides of the C-type pressing block II are milled with rounded corners. When the C-type pressing block II is press-fitted on the lower wheel hub bolts, the rim bolts next to it can be avoided, so that the rim bolts can be pressed individually to avoid interference.

[0058] 5. The press seat for reverse pressing of the lower wheel hub bolts adopts a high-strength welded box-type structure. The upper and lower plates of the press seat are milled after welding to ensure parallelism, ensuring that the C-type pressure block II can make flat contact when pressing the wheel hub bolts to avoid deviation.

[0059] 6. A U-groove is opened on the lower plate of the press seat. When the lower wheel hub bolts are reversely pressed, the telescopic rod of the hydraulic cylinder presses the press seat. When the pressure of the telescopic rod of the hydraulic cylinder is greater than the resistance of the bolt pressing, the C-type pressure block II reversely presses the wheel hub bolts until they fit the wheel hub. The wheel hub bolts can pass through the middle of the U-groove of the lower plate of the press seat to avoid interference.

[0060] 7. The height of the press seat for reverse press-fitting of the lower wheel hub bolts should take into account the extended length of the wheel hub bolts to avoid interference with the upper plate of the press seat when the wheel hub bolts are pressed to the bottom;

[0061] 8. C-type pressing block I and C-type pressing block II are integral forgings, which are finely processed after quenching and tempering, and finally quenched at 52-60HRC to ensure strength and avoid deformation during pressing.

[0062] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0063] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0064] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A two-way press-fit device for wheel hub bolts, characterized in that: include: Forward press-fit device, comprising: A power component I having a telescopic rod I for linear motion; A C-type pressing block I is assembled with one end of the power component I close to the telescopic rod I, the bottom plate of the C-type pressing block I is pressed on the upper flange structure I of the wheel hub, and the telescopic rod I passes through the top plate of the C-type pressing block I and acts on the upper wheel hub bolts to press the upper wheel hub bolts from top to bottom; Reverse press-fit device, comprising: Power component II, having a telescopic rod II for linear motion; A C-type pressing block II and a pressing seat, wherein the C-type pressing block II is assembled together with one end of the power component II close to the telescopic rod II, the bottom plate of the C-type pressing block II is pressed on the upper flange structure II after the wheel hub is flipped 180 degrees, and the telescopic rod II passes through the top plate of the C-type pressing block II and acts on the pressing seat to press the lower wheel hub bolts from bottom to top.

2. A wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: A through hole through which the telescopic rod I can pass is provided at the center of the top plate of the C-type pressure block I, and a circle of evenly spaced threaded holes is provided around the through hole. A plurality of mounting holes corresponding to the threaded holes are provided at one end of the fixing portion of the power component I close to the C-type pressure block I, and the power component I is connected to the C-type pressure block I by a plurality of bolts.

3. A wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: An outwardly protruding U-shaped groove is provided in the middle of the bottom plate of the C-shaped pressing block I, and the upper wheel hub bolt can pass through the middle of the U-shaped groove when being pressed downward by the telescopic rod I.

4. A wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: When the upper wheel hub bolt is pressed into the fitting wheel hub, the distance from the upper end surface of the upper wheel hub bolt to the lower end surface of the upper flange structure I is H1, the inner size of the C-type pressing block I is C1, the top plate thickness of the C-type pressing block I is D1, and the stroke of the telescopic rod I is L1, which needs to satisfy L1>C1+D1-H1.

5. A wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: A through hole through which the telescopic rod II can pass is provided at the center of the top plate of the C-type pressing block II, and a circle of evenly spaced threaded holes is provided around the through hole. A plurality of mounting holes corresponding to the threaded holes are provided at one end of the fixing portion of the power component II close to the C-type pressing block II, and the power component II is connected to the C-type pressing block II by a plurality of bolts.

6. A wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: A convex block is provided in the middle of the bottom plate of the C-shaped pressing block II. When the telescopic rod II is pressed downward, the convex block pushes the lower wheel hub bolt to move upward.

7. A wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: The pressure seat is a box-shaped structure consisting of a flat plate at the top, a C-shaped plate in the middle and a U-shaped groove plate at the bottom; The flat plate is in contact with the telescopic rod II. When the pressure seat is pressed downward by the telescopic rod II, the lower wheel hub bolts penetrate into the C-shaped plate through the U-shaped groove.

8. The wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: The lower wheel hub bolts are pre-installed on the wheel hub, the distance from the lower end surface of the lower wheel hub bolts to the upper end surface of the upper flange structure II is H2, the inner size of the C-type pressure block II is C2, the height of the pressure seat is L2, and C2>H2+L2 is required; When the lower wheel hub bolts are pressed into the fitted wheel hub, the length of the lower wheel hub bolts leaking out from the upper flange structure II is L4, and the height from the bottom surface of the press seat to the top surface of the press seat inner cavity is L3, which needs to satisfy L3>L4.

9. The wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: The power component I and the power component II are both hydraulic cylinders, and the cylinder bodies thereof are provided with a hydraulic cylinder oil return joint and a hydraulic cylinder oil inlet joint; The hydraulic cylinder oil return joint is connected to the oil return pipeline of the external hydraulic pump station, and the hydraulic cylinder oil inlet joint is connected to the oil inlet pipeline of the external hydraulic pump station.

10. The wheel hub bolt bidirectional press-fitting device according to claim 1, characterized in that: The C-type pressing block I and C-type pressing block II are integral forgings.

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