A limiting gasket locking device

Abstract

This utility model discloses a limiting shim locking device, which is installed on the limiting shim locking station on the mounting frame of a piston rod tightening machine for performing the locking operation of the limiting shim. The limiting shim locking device includes a sixth power component, a sixth transmission component, a sixth tightening fixture head, and a sixth up-and-down floating component. The sixth power component includes a sixth servo motor and a sixth reducer installed at the output end of the sixth servo motor. The sixth transmission component is connected to the output end of the sixth reducer and includes a sixth torque sensor and a sixth mounting base installed on the sixth torque sensor. The sixth tightening fixture head is mounted on the sixth mounting base. The beneficial effects of this utility model are: through the coordinated design of each component, this limiting shim locking device achieves precise, reliable, and efficient locking of the limiting shim, and is suitable for automated piston rod assembly production lines.

Description

Technical Field

[0001] This utility model relates to the field of automated production equipment technology, and in particular to a limiting gasket locking device. Background Technology

[0002] In the field of piston rod assembly, the locking of the limiting shims is a key process to ensure that the piston rod is reliably fixed to the connecting parts. Its locking accuracy and stability directly affect the overall assembly quality of the piston rod and its safety in subsequent use.

[0003] Traditional locking devices for limit shims typically use a common motor and a simple mechanical transmission structure to achieve locking. However, in practical applications, the following technical defects have been exposed: First, insufficient precision in locking force control. Existing devices often rely on operator experience or indirectly control torque only through motor speed, lacking a real-time torque monitoring and feedback mechanism. This easily leads to problems such as excessively tight locking force (causing shim deformation or piston rod thread damage) or excessively loose force (causing shim detachment or connection failure), failing to meet the requirements of high-precision assembly. Second, weak impact resistance of the transmission system. The power components (motor and reducer) often use a rigid direct-drive structure. The instantaneous impact vibration when the motor starts or stops is easily transmitted to the reducer, causing gear wear or breakage and shortening the equipment's service life. Third, low efficiency in fixture changeover. Tightening the fixture head and transmission components are mostly fixed by bolts. Changing to different specifications of fixture heads requires disassembling multiple bolts, which is time-consuming (usually 5-10 minutes), making it difficult to adapt to the flexible production needs of multiple specifications of limit shims. Fourth, poor contact buffering effect. During the locking process, the contact between the jig head and the gasket is a rigid collision, which can easily cause indentations or even deformation on the end face of the jig head or the surface of the gasket, affecting assembly consistency; fifth, the floating adjustment stability is insufficient. Although some devices are equipped with a floating structure, they lack guide and limit design, which can easily lead to uneven loading during the floating process, causing the spring to bend and fail or the gasket to be misaligned, further reducing the locking reliability.

[0004] Therefore, it is necessary to develop a limiting gasket locking device. After searching, no technical solution identical to this utility model was found. Utility Model Content

[0005] The main technical problem solved by this utility model is to provide a limiting gasket locking device, thereby solving one or more of the above-mentioned prior art problems.

[0006] To solve the above-mentioned technical problems, the present invention adopts a technical solution as follows: a limiting gasket locking device, which is set on the limiting gasket locking station on the mounting frame of the piston rod tightening machine, and is used to perform the locking operation of the limiting gasket; its innovation is that the limiting gasket locking device includes a sixth power component, a sixth transmission component, a sixth tightening fixture head and a sixth up and down floating component;

[0007] The sixth power component includes a sixth servo motor and a sixth reducer disposed at the output end of the sixth servo motor;

[0008] The sixth transmission assembly is connected to the output end of the sixth reducer and includes a sixth torque sensor and a sixth mounting base disposed on the sixth torque sensor;

[0009] The sixth tightening fixture head is assembled on the sixth assembly seat;

[0010] The sixth vertical floating assembly is disposed between the sixth mounting base and the sixth tightening fixture head, and includes a sixth fixed base and a sixth floating base arranged coaxially. The sixth fixed base is provided with a sixth spring groove, and a sixth spring is provided in the sixth spring groove. One end of the sixth spring is fixed to the bottom of the sixth spring groove, and the other end is fixedly connected to the top of the sixth floating base. The sixth spring elastically extends and retracts along the axial direction of the vertical floating assembly to realize the floating adjustment of the sixth tightening fixture head.

[0011] In some implementations, the output of the sixth servo motor and the sixth reducer are connected by a flexible coupling to buffer impact loads during transmission.

[0012] In some implementations, the sixth torque sensor is a digital torque sensor equipped with a signal output interface, which can output torque data during the tightening process in real time.

[0013] In some embodiments, the sixth mounting base and the sixth tightening fixture head are connected by a quick-change snap-fit ​​structure, which includes an annular groove on the sixth mounting base and an elastic claw on the top of the sixth tightening fixture head.

[0014] In some embodiments, a coaxial guide structure is provided between the sixth fixed seat and the sixth floating seat. The guide structure includes a guide post disposed at the bottom of the sixth fixed seat and a guide hole disposed at the top of the sixth floating seat. The guide post and the guide hole are fitted with a clearance to limit the floating direction.

[0015] The beneficial effects of this utility model are: through the coordinated design of each component, this limiting gasket locking device achieves precise, reliable and efficient locking of the limiting gasket, and is suitable for automated piston rod assembly production lines. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0017] Figure 1 This is a structural schematic diagram of a limiting gasket locking device according to the present invention.

[0018] Figure 2 This is a front view of a limiting gasket locking device of this utility model. Detailed Implementation

[0019] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] like Figure 1 and Figure 2 As shown, this utility model embodiment includes: a limiting washer locking device applied to the limiting washer locking station of a piston rod tightening machine, mainly used for precise locking of the limiting washer at the end of the piston rod. The specific structure, working principle, and advantages of this device are described in detail below with reference to the accompanying drawings:

[0021] The sixth power assembly consists of a sixth servo motor 410 and a sixth reducer 411 (preferably a planetary reducer with a reduction ratio of 1:10). The sixth servo motor 410 is fixed to the power mounting plate of the mounting bracket 005 by bolts, and its output shaft is coaxially connected to the input shaft of the sixth reducer 411 through a flexible coupling (such as a plum blossom-shaped flexible coupling). The elastic element of the flexible coupling (such as polyurethane material) can absorb the instantaneous impact vibration when the motor starts, avoid damage to the internal gears of the reducer caused by rigid transmission, and compensate for the slight misalignment of the two shafts, thus extending the service life of the power assembly.

[0022] The output end of the sixth reducer 411 is directly connected to the input shaft of the sixth torque sensor 420 (a digital torque sensor with a range of 50 N·m and an accuracy of ±0.5%). The output end of the sixth torque sensor 420 is fixedly connected to the sixth mounting base 421 via a flange. The sixth mounting base 421 has a stepped shaft structure with an annular groove (5 mm deep and 8 mm wide) on its top for quick-change connection with the sixth tightening fixture head 430. The digital torque sensor is connected to an external controller (such as a PLC) via a signal line and can output torque data during the tightening process in real time (sampling frequency 100 Hz) to ensure that the tightening force meets the process setting value (such as the target torque of 35 ± 2 N·m) and avoid problems such as shim falling off or piston rod loosening due to excessive tightness or looseness.

[0023] The top of the sixth tightening fixture head 430 is equipped with an elastic claw (made of 65Mn spring steel, with a barb structure at the end of the claw) that matches the annular groove of the sixth mounting base 421. During installation, the claw is aligned with the groove and pressed down. The claw is squeezed and retracted and then inserted into the groove. The barb limits the engagement with the bottom of the groove, achieving quick engagement. During disassembly, the fixture head is pulled upward. The claw is squeezed and retracted by the side wall of the groove and then disengages, completing the quick replacement. This structure allows the fixture head to be changed within 30 seconds and is compatible with limit shims of different specifications (such as diameters of φ20mm and φ25mm), significantly improving the flexible production capacity of the equipment.

[0024] The sixth floating assembly is located between the sixth mounting base 421 and the sixth tightening fixture head 430, and includes a coaxially nested sixth fixed base 441 and a sixth floating base 442. The sixth fixed base 441 is fixed to the bottom of the sixth mounting base 421 by bolts, and has an axially extending sixth spring groove (diameter φ15mm, depth 40mm) inside. The top of the sixth floating base 442 is coaxial with the sixth spring groove, and a spring mounting post (diameter φ10mm, height 5mm) is provided at the center of its top. The sixth spring 443 (made of high-elasticity alloy steel, elastic coefficient k=50N / mm) is sleeved on the spring mounting post, with one end fixed to the bottom of the spring groove (e.g., by welding) and the other end fixed to the top of the sixth floating base 442. To ensure the accuracy of the floating direction, the bottom of the sixth fixed seat 441 is provided with a guide post (diameter φ8mm, length 15mm), and the top of the sixth floating seat 442 is provided with a guide hole (diameter φ8.1mm). The guide post and the guide hole are fitted with a clearance (0.05mm clearance on one side) to restrict the floating seat to move only along the axial direction and avoid the failure of the spring due to eccentric load.

[0025] When the piston rod tightening machine delivers the piston rod to be tightened to the limit shim locking position, the external control system triggers the start of this device. The specific workflow is as follows:

[0026] Power transmission: The sixth servo motor 410 receives a PLC command to start and outputs power at a constant speed (e.g., 300 r / min). After being reduced and increased in torque by the sixth reducer 411, the power is transmitted to the sixth torque sensor 420 through a flexible coupling.

[0027] Torque monitoring and transmission: The sixth torque sensor 420 collects torque signals in real time and feeds them back to the PLC. The power is transmitted to the sixth mounting base 421 through the sensor, and then to the sixth tightening fixture head 430 through the quick-change snap-fit ​​structure.

[0028] Floating buffer and locking: When the sixth tightening fixture head 430 contacts the limiting shim, the reaction force of the shim pushes the sixth floating seat 442 upward to compress the sixth spring 443 (maximum compression 10mm), buffering the contact impact and avoiding deformation caused by rigid collision between the fixture head and the shim; at the same time, the guide post and guide hole cooperate to ensure that the floating direction is vertical and that the shim is subjected to uniform force.

[0029] Precise locking: When the torque reaches the set value (e.g., 35 N·m), the sixth torque sensor 420 triggers a signal, and the PLC controls the sixth servo motor 410 to stop, completing the precise locking of the limit shim.

[0030] The advantages of this technical solution are:

[0031] High-precision control: Real-time feedback through a digital torque sensor ensures that the locking force error is ≤±2N·m, meeting the requirements for high-reliability assembly;

[0032] Structural protection: Flexible couplings buffer vibrations, and floating components absorb shocks, extending the service life of power components and jig heads;

[0033] Quick changeover: The quick-change snap-fit ​​structure supports jig head replacement in seconds, adapts to multiple specifications of gaskets, and improves equipment versatility;

[0034] High stability: The guiding structure restricts the floating direction, avoiding spring failure or shim misalignment caused by off-center loading, and ensuring assembly consistency.

[0035] In summary, this limit shim locking device achieves precise, reliable, and efficient locking of the limit shims through the coordinated design of its components, making it suitable for automated piston rod assembly production lines.

[0036] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made using the content of this utility model specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A limiting washer locking device, which is installed on the limiting washer locking position on the mounting bracket (005) of a piston rod tightening machine, for performing a limiting washer locking operation; characterized in that: The limiting gasket locking device includes a sixth power component, a sixth transmission component, a sixth tightening fixture head (430), and a sixth up-and-down floating component; The sixth power component includes a sixth servo motor (410) and a sixth reducer (411) disposed at the output end of the sixth servo motor (410); The sixth transmission assembly is connected to the output end of the sixth reducer (411), and includes a sixth torque sensor (420) and a sixth mounting base (421) disposed on the sixth torque sensor (420); The sixth tightening fixture head (430) is mounted on the sixth mounting base (421); The sixth vertical floating assembly is disposed between the sixth mounting base (421) and the sixth tightening fixture head (430), including a sixth fixed base (441) and a sixth floating base (442) coaxially arranged. The sixth fixed base (441) is provided with a sixth spring groove, and a sixth spring (443) is provided in the sixth spring groove. One end of the sixth spring (443) is fixed to the bottom of the sixth spring groove, and the other end is fixedly connected to the top of the sixth floating base (442). The sixth spring (443) elastically extends and retracts along the axial direction of the vertical floating assembly to realize the floating adjustment of the sixth tightening fixture head (430).

2. The limiting washer locking device according to claim 1, characterized in that: The output ends of the sixth servo motor (410) and the sixth reducer (411) are connected by a flexible coupling to buffer the impact load during the transmission process.

3. The limiting washer locking device according to claim 1, characterized in that: The sixth torque sensor (420) is a digital torque sensor equipped with a signal output interface, which can output torque data during the tightening process in real time.

4. The limiting washer locking device according to claim 1, characterized in that: The sixth mounting base (421) and the sixth tightening fixture head (430) are connected by a quick-change snap-fit ​​structure, which includes an annular groove on the sixth mounting base (421) and an elastic claw on the top of the sixth tightening fixture head (430).

5. The limiting washer locking device according to claim 1, characterized in that: A coaxial guide structure is provided between the sixth fixed seat (441) and the sixth floating seat (442). The guide structure includes a guide post at the bottom of the sixth fixed seat (441) and a guide hole at the top of the sixth floating seat (442). The guide post and the guide hole are fitted with a clearance to limit the floating direction.

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