Scissor arm pneumatic assembly tool with floating support

Abstract

The utility model provides a kind of shearing fork arm pneumatic group pair tool with floating support, including tool platform, positioning assembly and pneumatic compression assembly being located on tool platform, still including floating type vertical support mechanism and control system, floating type vertical support mechanism is located on the middle position of tool platform along the length direction of shearing fork arm, floating type vertical support mechanism includes at least one floating support unit, floating support unit includes vertically arranged low-pressure cylinder and the support head connected to the piston rod end of low-pressure cylinder, low-pressure cylinder is installed in tool platform interior, support head is located above tool platform, control system is electrically connected with floating support unit and pneumatic compression assembly. By setting floating type vertical support mechanism on tool platform, the mechanism includes vertically arranged low-pressure cylinder and the support head connected to the piston rod end, forms flexible self-adapting support system, realizes active compensation and elimination to the gravity deflection of super-long shearing fork arm.

Description

Technical Field

[0001] This utility model relates to the field of mechanical manufacturing, and in particular to a pneumatic assembly tooling for a scissor lift with floating support. Background Technology

[0002] As a crucial load-bearing component of scissor lifts, the machining and assembly precision of the scissor arm directly affects the stability and operational safety of the entire machine. In current manufacturing processes, the assembly and riveting of the scissor arm typically rely on manual placement of the fork components onto simple tooling or flat fixtures, followed by manual or mechanical clamping for positioning, and then the riveting process. With the development of scissor lift platforms towards larger sizes and higher load capacities, scissor arms can reach lengths of several meters. The requirements for coaxiality and structural strength during assembly are becoming increasingly stringent. Therefore, the industry is gradually introducing pneumatic or hydraulic clamping devices to replace simple manual clamping, improving assembly efficiency and precision.

[0003] In existing pneumatic assembly tooling technology, rigid positioning is typically used. This involves setting a positioning block on a fixed tooling platform and using a lateral cylinder to forcefully push the scissor arm component against the positioning block for clamping and positioning. However, this traditional rigid positioning method reveals significant technical defects when dealing with ultra-long, large-span flexible scissor arms. Due to the significant gravitational deflection of the ultra-long scissor arm under its own weight, it bends downwards. Since the positioning reference surface of the tooling is flat, when the lateral cylinder clamps it, the middle part of the workpiece sags and cannot fully align with the positioning reference, resulting in the workpiece axis being a curve rather than a straight line, severely affecting coaxiality accuracy. Furthermore, to force the bent workpiece to conform to the flat tooling, the clamping cylinder must apply enormous pressure to forcibly "straighten" the workpiece. This generates significant assembly stress within the workpiece. When it is removed from the tooling after riveting, the release of this stress causes the workpiece to spring back and deform, rendering the previous positioning ineffective. In addition, rigid positioning requires extremely high consistency of incoming material dimensions. For workpieces with minute dimensions or geometric tolerances, forced clamping will only exacerbate stress concentration and deformation problems, affecting product quality stability and tooling applicability.

[0004] Therefore, how to effectively eliminate the gravitational deflection of ultra-long scissor arms, achieve stress-free assembly, improve coaxiality accuracy, and enhance the adaptability of tooling to incoming material tolerances are technical problems that urgently need to be solved in the current scissor arm manufacturing field. Utility Model Content

[0005] The technical problem to be solved by this utility model is: to solve the technical problems of existing pneumatic assembly tooling in handling ultra-long, flexible scissor arms, which are caused by the inability to effectively eliminate the gravitational deflection of the workpiece, resulting in the bending of the actual axis of the workpiece after assembly and poor coaxiality accuracy, as well as the excessive assembly stress caused by the use of rigid pressure positioning method, resulting in springback deformation after riveting. The present invention provides a scissor arm pneumatic assembly tooling with floating support that can achieve flexible adaptive positioning, eliminate gravitational deflection, and improve coaxiality accuracy.

[0006] The technical solution adopted by this utility model to solve its technical problem is: A pneumatic assembly tooling for a scissor lift with floating support includes a tooling platform, a positioning component and a pneumatic clamping component disposed on the tooling platform, a floating vertical support mechanism and a control system. The floating vertical support mechanism is disposed at the middle position along the length direction of the scissor lift on the tooling platform. The floating vertical support mechanism includes at least one floating support unit. The floating support unit includes a vertically arranged low-pressure cylinder and a support head connected to the end of the piston rod of the low-pressure cylinder. The low-pressure cylinder is installed inside the tooling platform, and the support head is located above the tooling platform. The control system is electrically connected to the floating support unit and the pneumatic clamping component.

[0007] Preferably, there are multiple floating support units, which are distributed at intervals on the tooling platform along the length direction of the scissor arm.

[0008] Preferably, the pneumatic clamping assembly includes multiple lateral cylinders and multiple clamping heads. The lateral cylinders are respectively installed on the left and right sides of the tooling platform, and each clamping head is connected to the piston rod end of the corresponding lateral cylinder.

[0009] Preferably, it also includes a rotary pressing angle cylinder, which is mounted on the tooling platform and used in conjunction with the floating vertical support mechanism.

[0010] Preferably, four rotary downward angle cylinders are provided, with one rotary downward angle cylinder between every two lateral cylinders.

[0011] Preferably, it also includes a shaft support plate, which is disposed on the tooling platform. The shaft support plate and the floating vertical support mechanism are on the same horizontal axis. The shaft support plate has a rectangular plate structure and its surface is concave inward.

[0012] Preferably, the top of the support head is provided with a roller or a V-shaped groove structure.

[0013] Preferably, the control system includes a PLC main controller, an input / output module connected to the PLC main controller, a pressure sensor, and a displacement sensor, wherein the input / output module is connected to the low-pressure cylinder and the pneumatic clamping assembly.

[0014] Preferably, the positioning component includes multiple positioning blocks, which are fixed to the tooling platform by bolts, and the positioning blocks are spaced apart along the length direction of the scissor arm.

[0015] The beneficial effects that this utility model can achieve are: By setting a floating vertical support mechanism on the tooling platform, which includes a vertically set low-pressure cylinder and a support head connected to the end of the piston rod, a flexible adaptive support system is formed. This system actively compensates for and eliminates the gravitational deflection of the ultra-long scissor arm, solves the technical problems of actual axis bending and poor coaxiality accuracy of the workpiece after assembly, fundamentally ensures the correctness of the positioning reference, and significantly improves the coaxiality accuracy of the ultra-long scissor arm.

[0016] By combining multiple lateral cylinders and rotary downward pressing angle cylinders with a floating vertical support mechanism, a three-dimensional flexible positioning constraint system is formed, which realizes precise positioning and stable clamping of the scissor arm in three-dimensional space. This solves the technical problem of poor adaptability of the tooling to workpieces with small dimensions or geometric tolerances, and significantly improves the applicability and process stability of the tooling.

[0017] By using a structural design where the shaft support plate and the floating vertical support mechanism are on the same horizontal axis, and in conjunction with the rollers or V-groove structure at the top of the support head, a multi-point coordinated flexible support system is formed, which achieves stable load-bearing and adaptive contact for ultra-long flexible components. Attached Figure Description

[0018] Figure 1 This is a side view of the tooling structure of the scissor lift pneumatic assembly with floating support in Example 1; Figure 2 This is a front view of the tooling structure of the scissor lift pneumatic assembly with floating support in Example 1; Figure 3 This is a top view of the scissor lift pneumatic assembly tooling with floating support in Example 1.

[0019] Reference numerals: 1. Tooling platform; 2. Positioning block; 3. Pneumatic clamping assembly; 31. Side cylinder; 32. Clamping head; 4. Rotary downward pressing angle cylinder; 5. Shaft support plate; 6. Floating support unit; 61. Low-pressure cylinder; 62. Support head. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, but these specific embodiments do not limit the scope of protection of the present invention in any way. Example

[0021] See appendix Figure 1-3A pneumatic assembly fixture for scissor lift arms with floating support is disclosed, comprising a fixture platform 1, a positioning component, a pneumatic clamping component 3, a floating vertical support mechanism, and a control system. This fixture is primarily used to address the issues of poor coaxiality accuracy due to gravitational deflection and springback deformation after riveting in the assembly of ultra-long scissor lift arms. It enables flexible adaptive positioning, significantly improving assembly quality and efficiency.

[0022] The tooling platform 1 is a rectangular rigid platform structure. Its length direction is parallel to the axis direction of the scissor arms to be assembled. Its width is sufficient to accommodate the scissor arm components and each group of positioning and clamping devices. The tooling platform 1 is fixed to the workshop floor by anchor bolts to form a stable foundation.

[0023] The positioning assembly is mounted on the tooling platform 1 and includes multiple positioning blocks 2. Each positioning block 2 has a rectangular block structure, designed according to the outline of the scissor lift arm, and is used to provide a lateral positioning reference for the scissor lift arm. The positioning blocks 2 are fixed to the tooling platform 1 with bolts to ensure that the components of the scissor lift arm can be accurately positioned and maintain the relative positional relationship required by the design. The number and arrangement of the positioning blocks 2 are determined according to the specific structure of the scissor lift arm, and are typically placed at both ends and key node positions of the scissor lift arm. In this embodiment, the positioning blocks 2 are divided into two different sizes. There are four smaller positioning blocks 2, arranged in pairs opposite each other on both sides near the central axis of the length direction of the tooling platform 1; there are four larger positioning blocks 2, arranged in pairs opposite each other on the outward sides of the smaller positioning blocks 2.

[0024] The pneumatic clamping assembly 3 is located on the side of the tooling platform 1, and includes six lateral cylinders 31 and six clamping heads 32. The lateral cylinders 31 are respectively installed on the upper, middle, and lower sides of the tooling platform 1, three on each side. The lateral cylinders 31 are standard industrial cylinders with sufficient thrust and stroke to drive the clamping heads 32 to clamp the scissor arms. The clamping heads 32 are designed to fit the contact surface of the scissor arms, with a smooth surface that can evenly distribute the clamping force and avoid local stress concentration. Between every two lateral cylinders 31, there are four rotating and pressing angle cylinders 4. The rotating and pressing angle cylinders 4 have dual functions of rotation and pressing, and can assist in clamping the scissor arms at specific angles. They work in conjunction with the floating vertical support mechanism to form a three-dimensional positioning constraint.

[0025] The shaft support plate 5 is set between the front and rear sets of lateral cylinders 31. The shaft support plate 5 and the floating vertical support mechanism are on the same horizontal axis, but the height is different from that of the support mechanism. The shaft support plate 5 has a rectangular plate structure with an inwardly concave surface, which is used to place and support the scissor arm workpiece. The shaft support plate 5 is fixedly installed on the tooling platform 1.

[0026] A floating vertical support mechanism is located at the middle of the scissor arm along the length of the tooling platform 1. It includes two vertically lifting floating support units 6, each consisting of a low-pressure cylinder 61 and a support head 62. The low-pressure cylinder 61 is installed at a preset position inside the tooling platform 1, with its axis pointing vertically upwards. The thrust is set to overcome only the weight of the support head 62 and provide a small lifting force. The support head 62 is connected to the piston rod end of the low-pressure cylinder 61 and is designed to fit the lower surface of the scissor arm. The top adopts a V-shaped structure or a structure with rollers (a V-shaped structure is chosen in this embodiment) to reduce friction and achieve better adaptive contact. The floating vertical support mechanism works in conjunction with a rotating downward-pressing angle cylinder 4: when the floating support unit 6 lifts the scissor arm from below to eliminate gravitational deflection, the rotating downward-pressing angle cylinder 4 simultaneously provides auxiliary constraints from above and the side, forming a stable clamping state and ensuring precise positioning of the scissor arm in three-dimensional space.

[0027] The control system is located on tooling platform 1 (not shown in the figure). It adopts a general-purpose PLC control system, including a PLC main controller, input / output modules, pressure sensors, displacement sensors, and an operation panel. The PLC main controller is responsible for the timing control and logic judgment of the entire workflow. The input / output modules connect to various pneumatic components and sensors. The pressure sensors are used to monitor the cylinder pressure and support force, and the displacement sensors are used to detect the position status of the support head 62 and the clamping head 32. The operation panel is located on the side of the tooling and includes a start button, a stop button, an emergency stop button, and various status indicator lights.

[0028] The working principle and method of the above-mentioned scissor lift pneumatic assembly with floating support for tooling: The operator places the scissor arm components to be assembled on the shaft support plate 5, and adjusts the height of the shaft support plate 5 according to the structural characteristics of the scissor arm to ensure stable support of the components. Under its own weight, the scissor arm generates gravitational deflection, bending downward in the middle.

[0029] The operator starts the tooling program via the control panel. The PLC control system first activates the floating vertical support mechanism. The low-pressure cylinder 61 drives the support head 62 to move upward, gently contacting the lower surface of the scissor arm and providing lifting force to lift the drooping scissor arm back to a horizontal position, eliminating gravitational deflection. At the same time, the rotating downward pressing angle cylinder 4 operates synchronously, providing auxiliary constraint on the scissor arm from above and the side, forming a stable clamping mechanism with the floating support unit 6.

[0030] After deflection compensation is completed, the PLC control system activates the pneumatic clamping assembly 3. The six lateral cylinders 31 operate in a preset sequence, and the clamping head 32 pushes the now straightened scissor arm towards the positioning block 2, achieving precise lateral positioning and clamping. Since the scissor arm axis has been restored to a straight state, the clamping process requires only a small amount of force to achieve reliable positioning.

[0031] After positioning is completed, the operator proceeds with the riveting process. Once riveting is finished, the PLC control system releases the pressure of each cylinder in reverse order: first releasing the lateral clamping, then releasing the vertical support and angular constraints, and finally the operator removes the completed workpiece.

[0032] The entire fixture, through the coordinated operation of the floating vertical support mechanism, the rotary pressing angle cylinder 4, and the pneumatic clamping assembly 3, achieves flexible adaptive positioning of the ultra-long scissor arm, effectively solving the problems of gravity deflection and assembly stress, and significantly improving assembly accuracy and product quality.

[0033] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any innovative improvements or substitutions based on this utility model should fall within the scope of the claims of this utility model. Furthermore, the parameters, materials, and processes mentioned in the above embodiments are not unique. Without departing from the technical essence of this utility model, those skilled in the art can make various alternative choices, and these alternative solutions should also be considered to fall within the scope of protection of this utility model.

Claims

1. A pneumatic assembly tooling for a scissor lift with floating support, comprising a tooling platform, a positioning assembly disposed on the tooling platform, and a pneumatic clamping assembly, characterized in that: It also includes a floating vertical support mechanism and a control system. The floating vertical support mechanism is located at the middle position along the length of the scissor arm on the tooling platform. The floating vertical support mechanism includes at least one floating support unit. The floating support unit includes a vertically arranged low-pressure cylinder and a support head connected to the end of the piston rod of the low-pressure cylinder. The low-pressure cylinder is installed inside the tooling platform, and the support head is located above the tooling platform. The control system is electrically connected to the floating support unit and the pneumatic clamping assembly.

2. The scissor lift pneumatic assembly tooling with floating support according to claim 1, characterized in that: The floating support unit is provided in multiple units, which are distributed at intervals on the tooling platform along the length direction of the scissor arm.

3. The scissor lift pneumatic assembly tooling with floating support according to claim 1, characterized in that: The pneumatic clamping assembly includes multiple lateral cylinders and multiple clamping heads. The lateral cylinders are respectively installed on the left and right sides of the tooling platform, and each clamping head is connected to the piston rod end of the corresponding lateral cylinder.

4. The scissor lift pneumatic assembly tooling with floating support according to claim 3, characterized in that: It also includes a rotary downward angle cylinder, which is mounted on the tooling platform and used in conjunction with the floating vertical support mechanism.

5. The scissor lift pneumatic assembly tooling with floating support according to claim 4, characterized in that: Four rotary downward angle cylinders are provided, with one rotary downward angle cylinder between every two lateral cylinders.

6. The scissor lift pneumatic assembly tooling with floating support according to claim 1, characterized in that: It also includes a shaft support plate, which is disposed on the tooling platform. The shaft support plate and the floating vertical support mechanism are on the same horizontal axis. The shaft support plate has a rectangular plate structure and its surface is concave inward.

7. The scissor lift pneumatic assembly tooling with floating support according to claim 1, characterized in that: The top of the support head is provided with a roller or a V-shaped groove structure.

8. The scissor lift pneumatic assembly tooling with floating support according to claim 1, characterized in that: The control system includes a PLC main controller, an input / output module connected to the PLC main controller, a pressure sensor, and a displacement sensor. The input / output module is connected to the low-pressure cylinder and the pneumatic clamping assembly.

9. The scissor lift pneumatic assembly tooling with floating support according to any one of claims 1-8, characterized in that: The positioning component includes multiple positioning blocks, which are fixed to the tooling platform by bolts, and the positioning blocks are spaced apart along the length of the scissor arm.

Images