Horizontal punch press safety fixture

Abstract

The utility model provides a horizontal punch safety fixing device, including support, be equipped with double -column pneumatic cylinder on the support, the piston rod of double -column pneumatic cylinder is connected with connecting rod, the fixed location sleeve of being equipped with on the support, and the connecting rod is connected with the location pin, and passes through the location sleeve, can stretch out or retract under the drive of double -column pneumatic cylinder, for inserting or separating from the hole on punch slider, the support of installing in punch workstation four around, the light curtain sensor is located on the support, is used for detecting the foreign matter signal in dangerous area, PLC controller, with light curtain sensor and double -column pneumatic cylinder electric connection, for receiving signal and control double -column pneumatic cylinder action. The utility model combines the electrical detection protection of light curtain with the mechanical rigid locking of location pin, forms the safety protection system of electrical - mechanical double interlocking, and the security is very high, fundamentally prevents the occurrence of the accident of slider sliding down, and the structural design is ingenious, and the implementation cost is low.

Description

Technical Field

[0001] This utility model relates to the field of safety protection technology for stamping equipment, and in particular to a safety protection device for a mechanically clutched horizontal punch press. Specifically, it is a safety fixing device that can mechanically lock the punch press slide after an emergency stop, preventing it from accidentally sliding down due to flywheel inertia or clutch failure. Background Technology

[0002] Mechanical clutch stamping presses are one of the core pieces of equipment in stamping and forming enterprises. With increasing production demands, the intensity and frequency of equipment operation are rising, leading to accelerated wear on the mechanical clutch components. In existing technologies, safety light curtains are commonly used as the primary protection measure. When the light curtain detects an operator entering a hazardous area, it sends a signal to cause the equipment to stop immediately.

[0003] However, this protection method has an inherent flaw: the flywheel system of a punch press has enormous rotational inertia and cannot immediately stop rotating after receiving a stop command. If the clutch malfunctions at this time (such as wear preventing disengagement), the punch press slide will continue to move under the drive of the flywheel, or it may accidentally slide down due to its own weight, causing serious hand injuries or impacts. Every year, companies suffer huge casualties and economic losses due to this type of "slide sliding down without cause" problem.

[0004] Therefore, there is an urgent need in the field for a secondary safety device that can provide mechanical rigid protection after an electrical emergency shutdown, fundamentally preventing accidental movement of the slider. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a horizontal punch press safety fixing device that is structurally sound, responsive, and highly reliable. It can quickly and mechanically lock the slide block after an emergency stop triggered by a light curtain, effectively solving the problem of slide block slippage caused by flywheel inertia and clutch malfunction, and fundamentally preventing such workplace accidents.

[0006] The technical solution of this utility model is implemented as follows: A safety fixing device for a horizontal punch press includes a support, on which a double-rod cylinder is provided. The piston rod of the double-rod cylinder is connected to a connecting rod. A positioning sleeve is fixed on the support, and a positioning pin is connected to the connecting rod and passes through the positioning sleeve. The positioning pin can extend or retract under the drive of the double-rod cylinder to insert into or disengage from holes on the punch press slide. A bracket is installed around the punch press worktable, and a light curtain sensor is installed on the bracket to detect foreign object signals in the danger zone. A PLC controller is electrically connected to the light curtain sensor and the double-rod cylinder to receive signals and control the action of the double-rod cylinder. Preferably, the device is equipped with a reset button, which is used to send a reset signal to the PLC after confirming safety, so as to retract the positioning pin.

[0007] The initial position of the locating pin (i.e., during normal operation) is in the retracted state, with its top end below the downward path of the slide block, thus not affecting the normal stroke of the slide block. When an extension command is received, the double-rod cylinder drives the locating pin to move upward, and its end precisely inserts into the pre-set special locating hole or process hole on the punch press slide block, forming a rigid mechanical block.

[0008] The beneficial effects of this utility model are: 1. Dual safety protection: The electrical detection and protection of the light curtain is combined with the mechanical rigid locking of the positioning pin, forming a dual electrical-mechanical interlocking safety protection system with extremely high safety.

[0009] 2. Rapid and reliable response: From the moment the light curtain detects danger to the moment the positioning pin fully extends, the entire process is completed in a very short time. It can effectively lock the slider before the flywheel comes to a complete stop, resulting in a fast response and high reliability.

[0010] 3. Proactive accident prevention: This device is a proactive protection mechanism, rather than a reactive remedy, which fundamentally prevents the occurrence of slide block slippage accidents.

[0011] 4. Simple structure and low modification cost: The device has a clever structural design and a high degree of component standardization, making it easy to retrofit and modify a large number of existing horizontal punch presses. The implementation cost is low and the benefits are significant.

[0012] 5. Forced Reset Logic: A logic is set up that requires human confirmation of safety before resetting, which avoids accidental device startup before the danger has been eliminated, further improving safety. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of the present invention installed on a punch press; Figure 2 This is a side view of the present invention; Figure 3 This utility model Figure 2 A magnified view of part A.

[0014] The labels in the diagram are as follows: 1- Support; 2- Double-rod cylinder; 3- Connecting rod; 4- Positioning sleeve; 5- Positioning pin; 6- Bracket; 7- Light curtain sensor; 8- Punch press body; 9- Punch press slide; 10- Slide positioning hole. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0016] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0017] See Figures 1 to 3 The embodiments of this utility model are as follows: First, the support 1 is securely installed on the punch press body 8 using high-strength bolts, ensuring its position so that the positioning pin 5 can accurately align with the slider positioning hole 10 on the slider 9 when extended. The double-rod cylinder 2 is fixed to the side or top of the support 1 via its mounting flange, and the two ends of the connecting rod 3 are respectively hinged to the piston rod of the double-rod cylinder 2 and the lower end of the positioning pin 5. The positioning sleeve 4 is pressed into or welded into a specific mounting hole in the support 1, ensuring that its inner hole axis is aligned with the axis of the slider positioning hole 10. A bracket 6 is installed around the working area of ​​the punch press, and a light curtain sensor 7 (which can be a multi-beam through-beam type) is installed on it to form an invisible light wall. The signal output line of the light curtain sensor 7 and the solenoid valve control line of the double-rod cylinder are connected to the PLC control cabinet on site.

[0018] Support: Rigidly fixed to the machine body or worktable of the punch press by bolts or welding, providing a stable mounting foundation for the entire device.

[0019] Double-rod cylinder: It is mounted vertically or nearly vertically on the support, and its cylinder body is fixedly connected to the support. This double-rod cylinder serves as the core power actuator and is driven by electronic control signals.

[0020] Connecting rod: One end of it is hinged to the end of the piston rod of the double-rod cylinder via a spherical bearing or a pin. This connection method can effectively compensate for alignment errors during installation and movement.

[0021] Positioning pin: It is fixedly connected to the other end of the connecting rod, and is preferably made of high-strength alloy steel, with sufficient shear strength to withstand the downward impact of the slider.

[0022] Positioning sleeve: It is fixedly installed on the support. Its inner hole and the positioning pin form a sliding pair, which plays a precise guiding and supporting role in the movement of the positioning pin, ensuring that it can be accurately aligned with the target hole on the slider.

[0023] Bracket: Installed around the working area of ​​the punch press to form a closed protective zone.

[0024] Light curtain sensor: A through-beam or reflective light curtain sensor, mounted on the bracket, is used to detect whether its light path is blocked by an operator or foreign object, thereby generating a danger signal.

[0025] PLC controller: As the control core of the system, its signal input terminal is electrically connected to the output terminal of the light curtain sensor, and its control output terminal is electrically connected to the solenoid valve of the double-rod cylinder.

[0026] The control logic of the PLC controller is as follows: When the light curtain sensor is triggered, the PLC immediately sends an emergency stop command to the main control system of the punch press. Simultaneously, or after a very short delay (e.g., 0.1-0.3 seconds) to ensure the clutch begins to disengage, the PLC sends a signal to the solenoid valve controlling the double-rod cylinder, driving the positioning pin to extend. Once the positioning pin extends, the system enters a safety lock state. In this state, even if there is a misoperation, the main starting circuit of the punch press is interlocked and cannot be started. Only after the dangerous situation is cleared, and the operator presses the dedicated "reset" button, will the PLC control the double-rod cylinder to retract the positioning pin, releasing the lock on the slide block, and the equipment can resume the normal start-up process.

[0027] The work process is as follows: During normal automatic operation of the punch press, the double-rod cylinder 2 is in the retracted state, and the positioning pin 5 is located inside the positioning sleeve 4, which will not interfere with the normal up-and-down reciprocating motion of the slide block 9. When any part of the operator's hand or body enters the protected area formed by the light curtain sensor 7, the light curtain is immediately triggered and sends a high-level signal to the PLC. After receiving this signal, the PLC performs the following two actions in parallel: a) Send an emergency stop signal to the main control system of the punch press to cut off the power to the main motor and control the clutch to disengage; b) Power is supplied to the solenoid valve controlling the double-rod cylinder 2 to drive the cylinder piston rod to extend.

[0028] The piston rod pushes the positioning pin 5 upward via the connecting rod 3. The positioning pin 5 is precisely guided along the inner hole of the positioning sleeve 4 and quickly inserts into the slider positioning hole 10 of the slider 9, which is descending or about to descend due to inertia / malfunction. Because the positioning pin 5 and its transmission mechanism have sufficient mechanical strength, the slider 9 is instantly and rigidly locked, unable to continue descending, thus protecting the operator in the danger zone.

[0029] After this, the equipment is in a safety locked state. The PLC will only control the double-rod cylinder 2 to retract, pull the positioning pin 5 out of the slider positioning hole 10, and release the interlock on the main start circuit after the operator confirms that the danger has been completely eliminated (e.g., personnel have left, there are no foreign objects in the mold, etc.) and actively walks to the control panel to press the "reset" button. Only then can the equipment start running again.

[0030] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and concept of this utility model, should be included within the protection scope of this utility model.

Claims

1. A safety fixing device for a horizontal punch press, comprising a support (1), characterized in that: The support (1) is provided with a double-rod cylinder (2), the piston rod of the double-rod cylinder (2) is connected to a connecting rod (3), the support (1) is fixedly provided with a positioning sleeve (4), the positioning pin (5) is connected to the connecting rod (3) and passes through the positioning sleeve (4), and can extend or retract under the drive of the double-rod cylinder (2) to insert or disengage from the hole on the punch press slide; a bracket (6) is installed around the punch press worktable, and a light curtain sensor (7) is installed on the bracket (6) to detect foreign object signals in the dangerous area; a PLC controller is electrically connected to the light curtain sensor (7) and the double-rod cylinder (2) to receive signals and control the action of the double-rod cylinder (2).

2. The safety fixing device for a horizontal punch press as described in claim 1, characterized in that, The device is equipped with a reset button, which is used to send a reset signal to the PLC after confirming safety, so that the positioning pin (5) is retracted.

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