Handheld shaft sleeve press-fitting device

Abstract

The handheld shaft sleeve press-fitting device comprises a hydraulic pump station, a hydraulic oil cylinder, an oil cylinder telescopic rod, a shaft sleeve extrusion assembly, a handle and a switch, the hydraulic oil cylinder is connected with the hydraulic pump station through a hydraulic pipeline, the oil cylinder telescopic rod is arranged in the hydraulic oil cylinder, and the shaft sleeve extrusion assembly is detachably arranged on the oil cylinder telescopic rod; the handle is installed on the hydraulic oil cylinder, the switch is arranged on one side of the handle, the shaft sleeve extrusion assembly comprises a first shaft sleeve seat, a second shaft sleeve seat and a fixing bolt, the first shaft sleeve seat is arranged on the oil cylinder telescopic rod in a sliding mode and abuts against a cylinder body of the hydraulic oil cylinder, and the second shaft sleeve seat is arranged at the top end of the oil cylinder telescopic rod in a sliding mode; the fixing bolt is fixedly connected with the oil cylinder telescopic rod, and the second shaft sleeve base abuts against the fixing bolt. The shaft sleeve press-fitting device is simple in overall structure, convenient to operate and compatible with press-fitting of shaft sleeves of various models, the assembly efficiency is effectively improved, meanwhile, stable press-in can be guaranteed, and the product percent of pass is increased.

Description

Technical Field

[0001] The invention belongs to the technical field of press-fitting, and in particular relates to a handheld shaft sleeve press-fitting device. Background Art

[0002] As a key type of aerial work platform, telescopic boom lifts are widely used in numerous fields, including construction, municipal maintenance, warehousing, and logistics. Providing a stable, height-adjustable work platform, they significantly expand the scope and efficiency of aerial work, and occupy an indispensable position in modern industrial production and urban construction and maintenance systems. As various industries increasingly demand greater safety and efficiency in aerial work, market demand for telescopic boom lifts continues to grow, driving continuous innovation in related manufacturing technologies.

[0003] Bushing installation is a crucial step in the manufacturing process of telescopic boom trucks. Currently, traditional manual operation is commonly used for bushing installation on production lines for telescopic boom trucks and other aerial work platform equipment. Workers typically rely on manual labor to hammer the bushing with a copper rod, pressing it into the workpiece hole. However, since the bushing and the workpiece hole generally have an interference fit, significant pressure is required to complete installation. The copper rod itself is heavy, and the long, high-intensity manual hammering operation not only fatigues workers, consumes significant labor costs, and reduces installation efficiency, but also, during the hammering process, it is difficult to ensure uniform and stable force, and the bushing is easily damaged due to uneven force, thus affecting product quality. Summary of the Invention

[0004] In order to at least partially solve the above technical problems in the prior art, the present invention provides a handheld shaft sleeve press-fitting device.

[0005] The handheld sleeve pressing device of the present invention includes a hydraulic pump station, a hydraulic oil cylinder, a cylinder telescopic rod, a sleeve extrusion assembly, a handle and a switch. The hydraulic oil cylinder is connected to the hydraulic pump station through a hydraulic pipeline and is used to provide driving force for the hydraulic oil cylinder. The cylinder telescopic rod is arranged in the hydraulic oil cylinder and is used to drive the cylinder telescopic rod to extend and retract. The sleeve extrusion assembly is detachably arranged on the cylinder telescopic rod and is used to extrude the sleeve. The handle is installed on the hydraulic oil cylinder. The switch is arranged on one side of the handle and is used to control the operation of the hydraulic oil cylinder, wherein:

[0006] The sleeve extrusion assembly includes a first sleeve seat, a second sleeve seat and a fixing bolt. The first sleeve seat is slidably set on the cylinder telescopic rod and abuts against the hydraulic cylinder body. The second sleeve seat is slidably set at the top of the cylinder telescopic rod. The fixing bolt is fixedly connected to the cylinder telescopic rod, and the second sleeve seat abuts against the fixing bolt.

[0007] Furthermore, in the above-mentioned handheld sleeve pressing device, a thread is provided on the top end of the oil cylinder telescopic rod, and the fixing bolt is engaged with the oil cylinder telescopic rod through the thread.

[0008] Furthermore, in the above-mentioned handheld sleeve pressing device, the first sleeve and the second sleeve are multi-stage cylindrical incremental integrally molded settings, and the material used is nylon.

[0009] Furthermore, in the above-mentioned handheld sleeve press-fitting device, the hydraulic cylinder controls the output thrust to be 3 to 3.5 times the output pressure when the first sleeve seat and the second sleeve seat press-fit the sleeve.

[0010] Furthermore, in the above-mentioned handheld sleeve press-fitting device, the output pressure when the first sleeve seat and the second sleeve seat press-fit the sleeve is:

[0011] F=p fmax πd f L f μ

[0012] Where, F is the pressing force (N), d f L is the diameter of the shaft sleeve and the shaft hole. f is the combined length of the sleeve and the shaft hole, μ is the friction coefficient of the joint surface between the sleeve outer surface and the shaft hole, and pfmax is the maximum unit pressure (N / mm2) that the joint surface between the sleeve and the shaft hole can withstand.

[0013] Furthermore, in the above-mentioned handheld sleeve press-fitting device, the maximum unit pressure that the pfmax sleeve and shaft hole interface can withstand is:

[0014]

[0015] δ max is the maximum interference of the shaft hole (mm), E a is the elastic modulus of the material of the containing part (N / mm2), E i is the elastic modulus of the contained material (N / mm2), C a 、C i is the coefficient.

[0016] Furthermore, in the above-mentioned handheld sleeve press-fitting device, C a 、C i The coefficients are:

[0017]

[0018] d a is the outer diameter of the containing part (mm), d i is the inner diameter of the contained part, the solid shaft is 0 (mm), and θ is the Poisson's coefficient.

[0019] The handheld shaft sleeve press-fitting device of the present invention has the following advantages and beneficial effects:

[0020] The overall structure of the present invention is simple, easy to operate, and compatible with various types of shaft sleeve press-fitting. The cooperation of the cylinder telescopic rod and the shaft sleeve extrusion assembly can realize the simultaneous press-fitting of the shaft sleeves at both ends of the shaft hole, effectively improving the assembly efficiency, and at the same time ensuring stable pressing, thereby improving the product qualification rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only used to further understand the embodiments of the present invention and constitute part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0022] Figure 1 It is a structural schematic diagram of the handheld shaft sleeve press-fitting device of the present invention;

[0023] Figure 2 It is a structural schematic diagram of the first sleeve seat or the second sleeve seat of the handheld sleeve press-fitting device of the present invention.

[0024] Description of reference numerals:

[0025] 100: workpiece; 200: shaft hole

[0026] 1: Hydraulic pump station; 2: Hydraulic cylinder;

[0027] 3: Cylinder telescopic rod, 31: thread;

[0028] 4: shaft sleeve extrusion assembly, 41: first shaft sleeve seat, 42: second shaft sleeve seat, 411: cylinder, 43: fixing bolt;

[0029] 5: handle; 6: switch. DETAILED DESCRIPTION

[0030] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] like Figures 1 to 2As shown, the handheld sleeve pressing device of the present invention includes a hydraulic pump station 1, a hydraulic cylinder 2, a cylinder telescopic rod 3, a sleeve extrusion assembly 4, a handle 5 and a switch 6. The hydraulic cylinder 2 is connected to the hydraulic pump station 1 through a hydraulic pipeline and is used to provide a driving force for the hydraulic cylinder 2. The cylinder telescopic rod 3 is arranged in the hydraulic cylinder 2 and is used to drive the cylinder telescopic rod 3 to extend and retract. The sleeve extrusion assembly 4 is detachably arranged on the cylinder telescopic rod 3 and is used to extrude the sleeve. The handle 5 is installed on the hydraulic cylinder 2. The switch 6 is arranged on one side of the handle 5 and is used to control the operation of the hydraulic cylinder 2.

[0032] The sleeve extrusion assembly 4 includes a first sleeve seat 41, a second sleeve seat 42 and a fixing bolt 43. The first sleeve seat 41 is slidably set on the cylinder telescopic rod 3 and abuts against the cylinder body of the hydraulic cylinder 2. The second sleeve seat 42 is slidably set at the top of the cylinder telescopic rod 3. The fixing bolt 43 is fixedly connected to the cylinder telescopic rod 3. The second sleeve seat 42 abuts against the fixing bolt 43. Therefore, when the cylinder telescopic rod 3 is recovered, the cylinder telescopic rod 3 slides in the first sleeve seat 41, so that the first sleeve seat 41 and the second sleeve seat 42 are correspondingly squeezed toward the middle, and the sleeves respectively installed on the first sleeve seat 41 and the second sleeve seat 42 are squeezed into the axial holes 200 on both sides of the workpiece 100.

[0033] Furthermore, in the handheld sleeve pressing device of the present invention, a thread 31 is provided at the top of the cylinder telescopic rod 3, and the fixing bolt 43 is engaged with the cylinder telescopic rod 3 through the thread 31, so that the cylinder telescopic rod 3 can drive the second sleeve seat 42 to move in the recovery direction when it is recovered.

[0034] Furthermore, in the handheld sleeve pressing device of the present invention, the first sleeve and the second sleeve are multi-stage cylinders 411 incrementally formed in one piece, so as to be suitable for pressing sleeves of various sizes. The material used is nylon, which effectively reduces the weight while ensuring structural strength.

[0035] Furthermore, in the handheld sleeve pressing device of the present invention, the output thrust controlled by the hydraulic cylinder 2 should be 3 to 3.5 times the output pressure when the first sleeve seat 41 and the second sleeve seat 42 are pressed into the sleeve, thereby avoiding damage to the sleeve during pressing while ensuring that the sleeve can be pressed into place.

[0036] Furthermore, in the handheld sleeve press-fitting device of the present invention, the output pressure when the first sleeve seat 41 and the second sleeve seat 42 are press-fitted into the sleeve is:

[0037] F=p fmax πd f L f μ

[0038] Where, F is the pressing force (N), d f L is the diameter of the shaft sleeve and the shaft hole.f is the combined length of the sleeve and the shaft hole, μ is the friction coefficient of the joint surface between the sleeve outer surface and the shaft hole, and pfmax is the maximum unit pressure (N / mm2) that the joint surface between the sleeve and the shaft hole can withstand.

[0039] Furthermore, in the above-mentioned handheld sleeve press-fitting device, the maximum unit pressure that the pfmax sleeve and shaft hole interface can withstand is:

[0040]

[0041] δ max is the maximum interference of the shaft hole (mm), E a is the elastic modulus of the material of the containing part (N / mm2), E i is the elastic modulus of the contained material (N / mm2), C a 、C i is the coefficient.

[0042] Furthermore, in the handheld sleeve press-fitting device of the present invention, C a 、C i The coefficients are:

[0043]

[0044] d a is the outer diameter of the containing part (mm), d i is the inner diameter of the contained part, the solid shaft is 0 (mm), and θ is the Poisson's coefficient.

[0045] Specifically, when the shaft sleeves are pressed into the shaft holes 200 at both ends of the workpiece 100, the hydraulic cylinder 2 is controlled by pressing the switch 6 to extend the cylinder telescopic rod 3 until it stops when the length is greater than the width of the workpiece 100. At this time, the fixing bolts 43 and the second sleeve seat 42 are removed, and one of the sleeves is passed through the cylinder telescopic rod 3 and inserted into the matching cylinder 411 on the first sleeve seat 41, so that one end of the sleeve is in contact with the end face of the lower cylinder 411 of the first sleeve seat 41. At this time, the cylinder telescopic rod 3 is passed through the workpiece 100, so that the sleeve Corresponding to the axial hole 200 at one end of the workpiece 100, at this time, another sleeve and the second sleeve seat 42 are successively sleeved on the cylinder telescopic rod 3, and the sleeve is sleeved on the matching cylinder 411 on the second sleeve seat 42, so that one end of the sleeve is in contact with the end face of the lower cylinder 411 of the second sleeve seat 42, and the sleeve is adjusted to correspond to the axial hole 200 at the other end of the workpiece 100. At this time, tighten the fixing bolt 43, and press the switch 6 to control the hydraulic cylinder 2 to work, so that the cylinder telescopic rod 3 is retracted. At this time, the first sleeve and the second sleeve are pressed onto the sleeves respectively.

[0046] To sum up, compared with the prior art, the handheld sleeve pressing device of the present invention has the following advantages and beneficial effects: the overall structure of the present invention is simple, easy to operate, and compatible with various types of sleeve pressing. The combination of the cylinder telescopic rod and the sleeve extrusion assembly can realize the simultaneous pressing of sleeves at both ends of the shaft hole, effectively improving the assembly efficiency, while ensuring stable pressing and improving the product qualification rate.

[0047] It should be noted that, in this document, unless otherwise expressly specified or limited, the term "connected" or its synonyms should be interpreted broadly. For example, "connected" can mean a fixed or removable connection; a mechanical or electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication between two elements or the interaction between two elements. A person of ordinary skill in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances. Furthermore, expressions such as "first" and "second" are used solely to distinguish one entity or operation from another and do not necessarily require or imply any actual relationship or order between these entities or operations. Furthermore, the terms "comprise," "include," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Furthermore, the terms "front," "rear," "left," "right," "upper," and "lower" herein are used with reference to the positions shown in the accompanying drawings.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A handheld sleeve press-fitting device, characterized in that: The handheld sleeve pressing device includes a hydraulic pump station, a hydraulic oil cylinder, a cylinder telescopic rod, a sleeve extrusion assembly, a handle and a switch. The hydraulic oil cylinder is connected to the hydraulic pump station through a hydraulic pipeline and is used to provide driving force for the hydraulic oil cylinder. The cylinder telescopic rod is arranged in the hydraulic oil cylinder and is used to drive the cylinder telescopic rod to extend and retract. The sleeve extrusion assembly is detachably arranged on the cylinder telescopic rod and is used to extrude the sleeve. The handle is installed on the hydraulic oil cylinder. The switch is arranged on one side of the handle and is used to control the operation of the hydraulic oil cylinder, wherein: The sleeve extrusion assembly includes a first sleeve seat, a second sleeve seat and a fixing bolt. The first sleeve seat is slidably set on the cylinder telescopic rod and abuts against the hydraulic cylinder body. The second sleeve seat is slidably set at the top of the cylinder telescopic rod. The fixing bolt is fixedly connected to the cylinder telescopic rod, and the second sleeve seat abuts against the fixing bolt.

2. The handheld sleeve pressing device according to claim 1, characterized in that: The top end of the oil cylinder telescopic rod is provided with a thread, and the fixing bolt is engaged with the oil cylinder telescopic rod through the thread.

3. The handheld sleeve pressing device according to claim 1, characterized in that: The first seat and the second seat are multi-stage cylindrical incremental integrally formed settings, and the material used is nylon.

4. The handheld sleeve press-fitting device according to claim 1, characterized in that: The hydraulic cylinder controls the output thrust to be 3 to 3.5 times the output pressure when the first sleeve seat and the second sleeve seat are press-fitted with the sleeve.

5. The handheld sleeve pressing device according to claim 4, characterized in that: The output pressure when the first sleeve seat and the second sleeve seat are press-fitted into the sleeve is: F=p tmax pd f L f m Where, F is the pressing force (N), d f L is the diameter of the shaft sleeve and the shaft hole. f is the combined length of the sleeve and the shaft hole, μ is the friction coefficient of the joint surface between the sleeve outer surface and the shaft hole, and pfmax is the maximum unit pressure (N / mm2) that the joint surface between the sleeve and the shaft hole can withstand.

6. The handheld sleeve press-fitting device according to claim 5, characterized in that: The maximum unit pressure that the joint surface of the pfmax sleeve and the shaft hole can withstand is: δ max is the maximum interference of the shaft hole (mm), E a is the elastic modulus of the material of the containing part (N / mm2), E i is the elastic modulus of the contained material (N / mm2), C a 、C i is the coefficient.

7. The handheld sleeve press-fitting device according to claim 6, characterized in that: C a 、C i The coefficients are: d a is the outer diameter of the containing part (mm), d i is the inner diameter of the contained part, the solid shaft is 0 (mm), and θ is the Poisson's coefficient.

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