A safety protection device for a hydraulic machine
Patent Information
- Application Number
- CN202522378011.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-10
- Publication Date
- 2026-10-16
- Estimated Expiration
- 2035-11-10
AI Technical Summary
[0003]在实际生产过程中，液压机防护门常出现“伪关闭”现象，即防护门看似处于关闭位置，但实际未完全贴合机身或锁定机构未真正到位，尤其在液压机换模、物料清理等高频操作后，易因门体边缘残留废料卡滞、铰链长期磨损导致关门偏差，或操作人员为图效率‘虚掩门体’，使得伪关闭现象成为生产中频发的安全隐患，而非偶发情况，现有技术仅通过电磁锁线圈通电信号作为关闭判定依据，但电磁锁的锁舌伸出动作与通电状态存在机械延迟，若因锁孔内油污堆积导致锁舌卡滞，即使线圈通电，锁舌也可能未完全插入锁孔，导致设备误判为“已关闭”却未形成有效锁定，同时，多数现有方案仅依赖设备“能否启动”作为防护门状态的间接反馈，未设置独立的状态提示机构，当防护门处于伪关闭时，操作人员需尝试启动设备才能发现异常，在多工位流水线作业中，这种滞后性易导致安全风险扩散
本实用新型通过锁舌滑动触发行程开关的设计，直接验证锁舌是否完全插入锁头卡槽，当锁舌因油污卡滞等问题未到位时，行程开关不触发，控制台可精准识别锁定异常，避免仅靠线圈通电信号导致的误判，同时，贴合检测组件通过导电橡胶条与金属触点的导电回路设计，验证防护门与机身是否完全贴合，即便防护门因废料卡滞、铰链磨损出现微小偏差或操作人员虚掩门体，导电回路无法形成，控制台也能快速捕捉贴合异常，通过电磁锁组件与贴合检测组件的双重检测协同设计，从根本上避免了现有液压机防护门的 “伪关闭” 安全隐患，同时结合控制台的实时状态反馈机制，大幅提升了操作安全性与设备可靠性。
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Figure CN224856471U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic press safety protection technology, and more specifically, it relates to a hydraulic press safety protection device. Background Technology
[0002] Hydraulic press safety protection devices are equipment or measures designed to prevent operators from being crushed, pinched, or otherwise injured by mechanical damage while operating hydraulic presses. They are directly related to the personal safety of operators and are a core aspect that cannot be ignored during the use of hydraulic presses.
[0003] In actual production, hydraulic press protective doors often exhibit a "false closure" phenomenon. This means the protective door appears closed, but is not actually fully fitted to the machine body or the locking mechanism is not properly engaged. This is especially problematic after high-frequency operations such as mold changing and material cleaning. Residual waste material on the door edges can cause jamming, long-term hinge wear can lead to closure deviations, or operators may "half-close" the door for efficiency. This false closure becomes a frequent safety hazard, not an isolated incident. Current technology relies solely on the electromagnetic lock coil's energization signal for closure determination. However, there is a mechanical delay between the extension of the electromagnetic lock's bolt and the energization status. If the bolt is jammed due to oil buildup in the lock hole, even with the coil energized, the bolt may not fully insert into the lock hole, causing the equipment to mistakenly identify it as "closed" without effective locking. Furthermore, most existing solutions rely solely on the equipment's "can it be started" status as indirect feedback for the protective door's position, lacking an independent status indication mechanism. When the protective door is falsely closed, operators must attempt to start the equipment to detect the anomaly. In multi-station assembly line operations, this lag can easily lead to the spread of safety risks. Utility Model Content
[0004] To achieve the above objectives, the present invention provides the following technical solution: A safety protection device for a hydraulic press includes the main body of the hydraulic press; A protective door for isolating the working area of the hydraulic press is movably provided on the outer side of the middle part of the hydraulic press body. An electromagnetic lock assembly and a bonding detection assembly are respectively provided at the junction of the protective door and the hydraulic press body. A control console is fixedly installed on one side of the protective door. The control console is electrically connected to the electromagnetic lock assembly and the bonding detection assembly respectively. The bottom of the protective door is provided with a lock head adapted to the electromagnetic lock assembly. The lock head has a slot in the middle. The electromagnetic lock assembly includes a lock body fixed to the main body of the hydraulic press. The lock body has a locking groove adapted to the lock head. The lock body has a latch for locking the lock head that is slidably arranged radially along the locking groove. The groove wall of the locking groove has a through hole that allows the latch to pass through along the sliding direction of the latch. A limit switch opposite to the latch is provided on the side of the through hole away from the latch. The fitting detection component includes a conductive rubber strip fixed to the bottom of the protective door and close to the hydraulic press body. The bottom of both ends of the conductive rubber strip has slots. The hydraulic press body has metal contacts that can be inserted into the slots at positions corresponding to the slots of the conductive rubber strip. When the conductive rubber strip contacts the metal contacts, a conductive circuit is formed.
[0005] Furthermore, the control console includes a dual-color indicator light for displaying the device status and a buzzer for issuing warning signals. Both the dual-color indicator light and the buzzer are electrically connected to the limit switch of the electromagnetic lock assembly and the conductive circuit output terminal of the contact detection assembly.
[0006] Furthermore, the protective door is vertically mounted with limiting posts at both ends for guiding the door to rise and fall. The limiting posts are fixedly connected to the main body of the hydraulic press. The top of the protective door is fixedly provided with a hydraulic cylinder for driving the protective door to open or close along the limiting posts. The fixed end of the hydraulic cylinder is connected to the main body of the hydraulic press.
[0007] Furthermore, the bottom of the limiting post is fitted with an elastic rubber pad to buffer the impact force of the door closing.
[0008] Furthermore, an insulating gasket is provided between the metal contact and the hydraulic press body, and the metal contact is insulated from the hydraulic press body through the insulating gasket.
[0009] Furthermore, an elastic limiting plate is provided axially inside the locking groove, and a spring for providing elastic restoring force is provided at the bottom of the elastic limiting plate. One end of the spring is fixedly connected to the elastic limiting plate, and the other end is fixed to the bottom inner wall of the lock body.
[0010] In summary, this utility model has the following beneficial effects: This invention utilizes a sliding limit switch design to directly verify whether the lock tongue is fully inserted into the lock head slot. When the lock tongue is not fully inserted due to oil or other issues, the limit switch will not trigger, allowing the control console to accurately identify locking anomalies and avoid misjudgments caused by relying solely on coil energization signals. Simultaneously, the fit detection component verifies whether the protective door and the machine body are fully fitted through a conductive circuit design using conductive rubber strips and metal contacts. Even if the protective door is jammed by waste materials, has minor deviations due to hinge wear, or the operator partially closes the door, preventing the conductive circuit from forming, the control console can quickly detect fit anomalies. Through the dual detection and collaborative design of the electromagnetic lock component and the fit detection component, the "false closure" safety hazard of existing hydraulic press protective doors is fundamentally avoided. Furthermore, combined with the real-time status feedback mechanism of the control console, operational safety and equipment reliability are significantly improved. Attached Figure Description
[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.
[0012] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the structure of the protective door in this utility model; Figure 3 This is a schematic diagram of the electromagnetic lock assembly in this utility model; Figure 4 This is a schematic diagram showing the position of the conductive rubber strip in the bonding detection component of this utility model; Figure 5 This is a schematic diagram of the conductive rubber strip in the bonding detection component of this utility model; Figure 6 This is a schematic diagram of the structure of the metal contact in the bonding detection component of this utility model; Figure 7 This is a schematic diagram of the control console in this utility model.
[0013] In the picture: 1. Hydraulic press body; 2. Protective door; 201. Lock head; 202. Limiting post; 203. Hydraulic cylinder; 3. Electromagnetic lock assembly; 301. Lock body; 302. Lock tongue; 303. Limit switch; 304. Elastic limit plate; 305. Spring; 4. Fitting detection assembly; 401. Conductive rubber strip; 402. Metal contact; 5. Control console; 501. Dual-color indicator light; 502. Buzzer. Detailed Implementation
[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.
[0015] Example: The following is in conjunction with the appendix Figure 1-7 The present invention will be described in further detail below.
[0016] Please see Figure 1-7 This utility model provides a technical solution: a safety protection device for a hydraulic press, such as... Figure 1-7As shown, it includes the hydraulic press body 1; A protective door 2 for isolating the working area of the hydraulic press is movably installed on the outer side of the middle part of the hydraulic press body 1. An electromagnetic lock assembly 3 and a bonding detection assembly 4 are respectively installed at the junction of the protective door 2 and the hydraulic press body 1. A control console 5 is fixedly installed on one side of the protective door 2. The control console 5 is electrically connected to the electromagnetic lock assembly 3 and the bonding detection assembly 4 respectively.
[0017] like Figure 2 As shown, the bottom of the protective door 2 is provided with a lock head 201 adapted to the electromagnetic lock assembly 3. A through slot is opened in the middle of the lock head 201. Limiting posts 202 for guiding the lifting and lowering of the protective door 2 are installed through both ends of the protective door 2 in the vertical direction. The limiting posts 202 are fixedly connected to the hydraulic press body 1. The top of the protective door 2 is fixedly provided with a hydraulic cylinder 203 for driving the protective door 2 to open or close along the limiting posts 202. The fixed end of the hydraulic cylinder 203 is connected to the hydraulic press body 1. The fixed end of the hydraulic cylinder 203 is bolted to the top crossbeam of the hydraulic press body 1 through a flange. The piston rod end is hinged to the connecting seat welded to the top of the protective door 2 to realize the smooth lifting and lowering of the protective door 2. The bottom of the limiting post 202 is fitted with an elastic rubber pad 204 to buffer the impact of the closing of the protective door 2. The elastic rubber pad 204 is made of nitrile rubber to prevent the door from rigidly colliding with the machine body.
[0018] like Figure 3 As shown, the electromagnetic lock assembly 3 includes a lock body 301 fixed to the hydraulic press body 1. The lock body 301 has a locking groove adapted to the lock head 201. A guide cone surface is machined at the end of the locking groove to facilitate insertion. A latch 302 for locking the lock head 201 is slidably disposed within the lock body 301 along the radial direction of the locking groove. A through hole is provided on the groove wall of the locking groove along the sliding direction of the latch 302, allowing the latch 302 to pass through. A limit switch 303 is provided on the side of the through hole away from the latch 302, opposite to the latch 302. When the latch 302 is fully extended and inserted into the through hole in the lock head 201's slot and locking groove, the boss presses against it. When the limit switch 303 contacts close, it outputs a locked position signal. An elastic limit plate 304 is provided axially inside the locking groove. A spring 305 is provided at the bottom of the elastic limit plate 304 to provide elastic restoring force. One end of the spring 305 is fixedly connected to the elastic limit plate 304, and the other end is fixed to the bottom inner wall of the lock body 301. When the lock head 201 does not enter the locking groove, the spring 305 is in its natural state, which lifts the elastic limit plate 304 and blocks the lock tongue 302 from contacting the through hole of the limit switch 303, so that the lock tongue 302 cannot pass through the through hole of the locking groove and contact the limit switch 303 with the slot of the lock head 201.
[0019] like Figure 4-6As shown, the bonding detection component 4 includes a conductive rubber strip 401 fixed to the bottom of the protective door 2 and close to the side of the hydraulic press body 1. The conductive rubber strip 401 is fixed to the bottom edge of the protective door 2 by countersunk bolts. The rubber strip is embedded with copper wire mesh to ensure conductive continuity. The bottom of both ends of the conductive rubber strip 401 are provided with slots. The hydraulic press body 1 is provided with metal contacts 402 that can be inserted into the slots at positions corresponding to the slots of the conductive rubber strip 401. The metal contacts 402 are made of brass and the ends are machined into hemispherical shapes to reduce friction during insertion. When the conductive rubber strip 401 contacts the metal contacts 402, a conductive circuit is formed. An insulating gasket is provided between the metal contact 402 and the hydraulic press body 1. The metal contact 402 is insulated from the hydraulic press body 1 through the insulating gasket. The insulating gasket is made of polytetrafluoroethylene and is fixed in the mounting hole of the machine body by bolts to achieve electrical isolation between the metal contact 402 and the machine body and avoid short circuit interference.
[0020] like Figure 7 As shown, the control console 5 includes a dual-color indicator light 501 for displaying the device status and a buzzer 502 for issuing warning signals. Both the dual-color indicator light 501 and the buzzer 502 are electrically connected to the limit switch 303 of the electromagnetic lock assembly 3 and the conductive circuit output terminal of the contact detection assembly 4. The dual-color indicator light 501 built into the control console 5 is made of LED material, with red corresponding to abnormal status and green corresponding to normal status.
[0021] Working principle: When the hydraulic press control system issues a closing command, the piston rod of the hydraulic cylinder 203 extends and pushes the protective door 2 to slide down along the limit post 202. When the protective door 2 descends to the near-closed position, the lock head 201 first inserts into the locking groove of the electromagnetic lock assembly 3, compresses the elastic limit plate 304 to compress the spring 305, and the electromagnetic lock assembly 3 is energized. The lock tongue 302 slides radially through the slot of the lock head 201 and the through hole in the locking groove. When the lock tongue 302 is fully in place, its end boss triggers the limit switch 303. The limit switch 303 closes and sends a "lock in place" signal to the control console 5. When the protective door 2 is fully closed, the conductive rubber strip 401 at its bottom precisely aligns with the metal contact 402 on the machine body. The metal contact 402 is inserted into the slot of the conductive rubber strip 401, and the conductive rubber strip 401 and the metal contact 402 make contact, forming a closed conductive circuit. The electrical signal generated by the conductive circuit is transmitted to the control console 5. After the control console 5 receives both the "locked in place" and "fitted in place" signals, it determines that the protective door 2 is in a normally closed state, the dual-color indicator light 501 switches to green, and the hydraulic press is allowed to start working. If the protective door 2 is not fully fitted to the machine body, such as when waste material is stuck at the edge, and the conductive rubber strip 401 and the metal contact 402 do not form a closed circuit, the control panel 5 will only receive the "locked in place" signal and determine it as "abnormal fit". The dual-color indicator light 501 will switch to red, the buzzer 502 will start and emit a warning sound, and the hydraulic press will be prohibited from starting. If the electromagnetic lock tongue 302 is not fully inserted into the lock head 201 slot due to oil contamination, and the limit switch 303 is not triggered, the control panel 5 will only receive the "fitted in place" signal and determine it as "abnormal lock". Similarly, the red indicator light and the buzzer 502 will be triggered to warn, and the hydraulic cylinder 203 will automatically drive the protective door 2 to rise, making it easier for the operator to troubleshoot the fault. If the operator "half-closes" the protective door 2, neither locking nor fitting is achieved, the control panel 5 will not receive any effective signal and will directly trigger the warning mechanism. The protective door 2 will automatically open completely under the action of the hydraulic cylinder 203 to avoid structural damage caused by forced locking.
[0022] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example that is included in at least one embodiment or example of the present invention.
[0023] In this specification, the illustrative expressions of the terms used above do not necessarily refer to the same embodiments or examples.
[0024] Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0025] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A safety protection device for a hydraulic press, characterized in that, The hydraulic press body (1) includes a protective door (2) movably arranged on the outer side of the middle part of the hydraulic press body (1). An electromagnetic lock assembly (3) and a bonding detection assembly (4) are respectively arranged at the junction of the protective door (2) and the hydraulic press body (1). The protective door (2) is provided with a lock (201) at the bottom, and a slot is provided in the middle of the lock (201); The electromagnetic lock assembly (3) includes a lock body (301) fixed to the hydraulic press body (1). The lock body (301) has a locking groove adapted to the lock head (201) inside. The lock body (301) has a latch (302) for locking the lock head (201) slidably disposed inside. The groove wall of the locking groove has a through hole along the sliding direction of the latch (302) for the latch (302) to pass through. The through hole has a limit switch (303) opposite to the latch (302) on the side away from the latch (302). The fitting detection component (4) includes a conductive rubber strip (401) fixed to the bottom of the protective door (2) and close to the side of the hydraulic press body (1). The bottom of both ends of the conductive rubber strip (401) are provided with slots. The hydraulic press body (1) is provided with metal contacts (402) that can be inserted into the slots at positions corresponding to the slots of the conductive rubber strip (401). When the conductive rubber strip (401) contacts the metal contacts (402), a conductive circuit is formed.
2. The hydraulic press safety protection device according to claim 1, characterized in that, A control panel (5) is fixedly installed on one side of the protective door (2). The control panel (5) is electrically connected to the electromagnetic lock assembly (3) and the fit detection assembly (4). The control panel (5) includes a dual-color indicator light (501) for displaying the status of the device and a buzzer (502) for issuing a warning signal. The dual-color indicator light (501) and the buzzer (502) are both electrically connected to the limit switch (303) of the electromagnetic lock assembly (3) and the conductive circuit output terminal of the fit detection assembly (4).
3. The hydraulic press safety protection device according to claim 1, characterized in that, The protective door (2) has vertically installed limit posts (202) at both ends for guiding the lifting and lowering of the protective door. The limit posts (202) are fixedly connected to the hydraulic press body (1). The top of the protective door (2) is fixedly provided with a hydraulic cylinder (203) for driving the protective door (2) to open or close along the limit posts (202). The fixed end of the hydraulic cylinder (203) is connected to the hydraulic press body (1).
4. A safety protection device for a hydraulic press according to claim 3, characterized in that, The bottom of the limiting post (202) is fitted with an elastic rubber pad (204) for buffering the impact force of the closing of the protective door (2).
5. A safety protection device for a hydraulic press according to claim 1, characterized in that, An insulating gasket is provided between the metal contact (402) and the hydraulic press body (1), and the metal contact (402) is insulated from the hydraulic press body (1) through the insulating gasket.
6. A safety protection device for a hydraulic press according to claim 1, characterized in that, An elastic limiting plate (304) is provided axially inside the locking groove. A spring (305) for providing elastic restoring force is provided at the bottom of the elastic limiting plate (304). One end of the spring (305) is fixedly connected to the elastic limiting plate (304), and the other end is fixed to the bottom inner wall of the lock body (301).