Door stopper with anti-pinch function

Abstract

A door limiter with an anti-pinch function belongs to the field of active automobile safety. As shown in FIG1 , the present invention is improved on the basis of the existing spring-type door limiter commonly used in the market. Infrared sensors are installed on the door and the door frame to sense whether there is a foreign object between the door and the door frame; a hydraulic cylinder and a piston are added to the rear end of the limit box; hydraulic oil is used as the working medium; the diaphragm is deformed after being subjected to the hydraulic pressure to make the contacts contact, so as to identify the door closing stroke, door opening stroke and door immobility, thereby preventing the system from starting incorrectly; the passage path of the hydraulic oil flowing from the hydraulic cylinder back to the variable volume oil storage tank is suddenly changed from a main oil channel hole with a larger diameter to a bypass hole with a smaller diameter to increase the resistance to closing the door, so as to quickly slow down the closing speed of the door, thereby achieving the anti-pinch effect; a safety reminder function is added to make the driver and passengers feel more at ease when using the vehicle.

Description

[0001] A door stopper with an anti-pinch function belongs to the field of active automobile safety, and specifically involves devices such as a door stopper, a hydraulic cylinder, a piston, a solenoid valve, a variable volume oil storage tank, hydraulic oil, an infrared sensor, a control system, and a safety reminder function. Background Art

[0002] When a hinged car door is closed, the force applied is great. If a person accidentally places his hand on the door frame at this time, it is very likely to cause his hand to be pinched or his bone to be broken. After searching the patent with the publication number of "CN 112761505 A", it is found that: an emergency pop-up panel device is set at the door frame of the car, and it is controlled by an infrared sensor; when it senses that a child is close to the door, the emergency pop-up panel pops up under the action of the motor and the emergency spring to prevent the door from closing, thereby reducing the risk of the door pinching the hand; but the defects of this technology are: 1. When the emergency pop-up panel pops up, if the body part of the person happens to press on the door and the emergency pop-up panel, if the door is closed at this time, the hand will be pinched between the door and the emergency pop-up panel; 2. During the door opening process, the driver and passengers usually open the door while walking out of the door. At this time, the infrared sensor can also sense the presence of foreign matter between the door and the door frame. Since this technical solution lacks a door travel recognition solution, it is very likely that the anti-pinch mechanism will be erroneously activated, causing the emergency pop-up panel to pop up erroneously, and it is possible that it will just pop up on the body part of the person, causing danger; so this technical solution cannot completely solve the problem of door anti-pinch. After searching the patent with the publication number of "CN 110424852 The patent of "B" uses the following: a protective structure is arranged at the lower end of the car door and the lower end of the door frame near the car door hinge, and a control mechanism is arranged in the protective structure. When the car door clamps the human foot, the guide rod assembly can play a certain buffering role, and the resistance mechanism will extend to resist the car door and immediately push the car door open to avoid further damage to the foot; but the defects of this technology are: 1. The protective mechanism will not be activated until the car door actually clamps the human body, which is a passive safety device; because the force used by the driver and passengers to close the car door in real life is very large, when the human body part 1. The protective mechanism is activated only after a person's foot is pinched, which is actually very risky; 2. In real life, the inner side of the car door is a decorative panel protruding inward. When the car door is closed, most of the decorative panels extend inward about 5 to 10 centimeters into the car. That is to say, even if the anti-pinch mechanism described in this patent is installed, when a person's foot is pinched by the car door, the first thing that touches the person's foot is the decorative panel rather than the anti-pinch mechanism; 3. The speed at which the resistance mechanism extends out to resist the car door and immediately pushes the car door open is fast, and the resistance point of the car door is easily damaged; so this technical solution also does not completely solve the problem of anti-pinching of car doors. Summary of the invention

[0003] The main contents of the present invention are: in view of the problem that the existing anti-pinch technology of hinged doors is imperfect, the present invention optimizes and improves the spring-type door limiter commonly used on the market, and provides a door limiter with anti-pinch function.

[0004] The main problem solved by the present invention is: a door limiter with an anti-pinch function is an active safety protection device. When the sensor senses that there is a foreign object (including human body parts, clothes, seat belts, other items, etc.) between the door and the door frame, it can actively and quickly increase the resistance of the driver and passengers to close the door, quickly slow down the closing speed of the door, and issue a safety reminder at the same time (such as: (1) Voice reminder: The anti-pinch system has been activated, please pay attention to safety. (2) Sound reminder: A special safety reminder sound is issued. (3) Resistance reminder: The driver and passengers feel that the door suddenly becomes very heavy and can hardly be closed.), reminding the driver and passengers to remove the foreign object and pay attention to safety. After the driver and passengers remove the foreign object, the resistance of closing the door returns to normal, the speed of closing the door returns to normal, and the driver and passengers can close the door normally.

[0005] As attached Figure 1 As shown, the present invention is optimized and improved on the basis of the commonly used spring-type door limiter on the market, and the technical scheme adopted is: infrared sensors are installed on the door and the door frame to sense whether there is foreign matter between the door and the door frame; a hydraulic cylinder and a piston are added to the rear end of the limit box; hydraulic oil is used as the working medium; the diaphragm is deformed after being subjected to the liquid pressure to make the contacts contact, so as to identify the door closing stroke, door opening stroke and door immobility, thereby preventing the system from starting incorrectly; the passage path of the hydraulic oil flowing from the hydraulic cylinder back to the variable volume oil storage tank is used to quickly change from a larger diameter main oil channel hole to a smaller diameter bypass hole to increase the resistance to closing the door, so as to quickly slow down the closing speed of the door, thereby achieving the effect of anti-pinch; a safety reminder function is added to make the driver and passengers feel more at ease when using the vehicle.

[0006] The main advantages of the present invention are: 1. It solves the problem of imperfect existing door anti-pinch technology. 2. It adopts non-contact infrared sensors, which respond quickly and can achieve active safety protection, greatly increasing practicality and safety. 3. It adds a safety reminder function to remind drivers and passengers to remove foreign objects and pay attention to safety, so that drivers and passengers can use the car with more peace of mind. 4. The diaphragm is deformed after being subjected to liquid pressure to make the contacts contact to accurately identify the door status, thereby preventing the system from starting incorrectly. 5. The flow path of the hydraulic oil is quickly changed from the main oil channel with a larger diameter to the bypass hole with a smaller diameter to slow down the closing speed of the door to achieve the anti-pinch effect without causing damage to the door. 6. It has a simple structure, low cost, easy production and strong practicality. 7. The variable volume oil storage tank structure is adopted to completely isolate the hydraulic oil from the outside world, integrating the functions of waterproofing, dustproofing and moisture-proofing, which is conducive to ensuring the stability of the anti-pinch function and increasing the service life of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 ——The overall structure of a door stopper with anti-pinch function Figure 2 ——Structure of hydraulic cylinder Figure 3 ——The position of the valve core and the contact point when there is no foreign matter between the door and the door frame during the normal closing stroke of the door Figure 4 ——The position of the valve core and the contact point when there is a foreign object between the door and the door frame during the door closing stroke Figure 5 ——The position of the valve core and the contact point during the door opening stroke and when the door is not moving DETAILED DESCRIPTION

[0008] As a preferred example, a door limiter with anti-pinch function is recommended to be installed near the door hinge. The mounting base is installed on the door frame through the mounting hole. One end of the limit box is installed on the door through the mounting bolt, and is movably connected with the pin of the mounting base through the pin mounting hole of the limit pull rod. During the door closing stroke, the distance between the car door and the door frame decreases, and the limit box moves to the right closer to the mounting seat under the action of the car door. Since the limit pull rod is movably connected to the pin on the mounting seat through the pin mounting hole, the limit pull rod does not move to the left or right. Therefore, when the limit box moves to the right, it is equivalent to the limit pull rod pushing the piston to the left in the hydraulic cylinder; during the door opening stroke, the distance between the car door and the door frame increases, and the limit box moves to the left away from the mounting seat under the action of the car door. Similarly, since the limit pull rod is movably connected to the pin on the mounting seat through the pin mounting hole, the limit pull rod also does not move to the left or right. Therefore, when the limit box moves to the left, it is equivalent to the limit pull rod pushing the piston to the right in the hydraulic cylinder.

[0009] Combined with Figure 1 To the attached Figure 2 , a door stopper with anti-pinch function, the structure of which includes a mounting seat, a stop box, a stop pull rod, a piston, a hydraulic cylinder, a solenoid valve, a variable volume oil storage tank, hydraulic oil, etc. The mounting seat is composed of a mounting plate, a mounting hole, a pin shaft, etc.; the stop box is composed of a spring 3, a slider, a mounting bolt, etc. Since the present invention is improved on the basis of a spring-type door stopper, the detailed structure and working principle of the mounting seat, the stop box, and the stop pull rod are not described here in detail. The following is a detailed description of the improved part.

[0010] The hydraulic cylinder is designed on the left side of the limit box and is integrated with the limit box. The upper end of the left side of the hydraulic cylinder is the solenoid valve, and on the hydraulic cylinder wall just below the solenoid valve are the push rod through hole and the sealing ring installation hole; the push rod through hole is above the sealing ring installation hole, and its diameter is slightly larger than the diameter of the solenoid valve push rod, and its function is to pass the push rod of the solenoid valve; the sealing ring installation hole is below the push rod through hole, and its diameter is slightly larger than the diameter of the push rod through hole, and its function is to install the sealing ring; on the inner wall of the hydraulic cylinder just below the sealing ring installation hole is the valve seat of the solenoid valve; the bypass hole is on the right side of the valve seat and close to the valve seat, and its diameter is much smaller than the valve seat. The upper end of the bypass hole is connected to the hydraulic cylinder, and the lower end bypasses the valve seat to connect to the main oil channel; the left and right lengths from the bypass hole to the rightmost limit box in the hydraulic cylinder are slightly larger than the sum of the lengths of the limit rod and the piston; on the left side of the solenoid valve core and valve seat in the hydraulic cylinder is diaphragm 1, which is made of soft material and will move to the left and right when subjected to hydraulic pressure The diaphragm 1 is fixed and tightly connected to the inner wall of the hydraulic cylinder to form a sealed cavity on the left side of the diaphragm 1; a contact and a spring 2 are designed in the sealed cavity, wherein the contact is divided into two, one contact is fixedly installed on the inner wall of the hydraulic cylinder at the leftmost end of the hydraulic cylinder, and another contact is fixedly installed on the left end of the diaphragm 1 opposite to the contact, and the springs are respectively sleeved on the two contacts and insulated from the two contacts, one end of which supports the inner wall of the hydraulic cylinder and the other end supports the diaphragm 1. Under normal action, the elastic force of the spring 2 can overcome the liquid pressure generated by the elastic force of the diaphragm 2 when the piston is at the leftmost position of the hydraulic cylinder, so that the two contacts will not contact under the action of the spring 2; the two contacts are connected to the control system, and when the two contacts are combined, a passage is formed, and the control system will recognize it as a door closing stroke; when the two contacts are not in contact, a circuit is formed, and the control system will recognize it as a door opening stroke or the door is immobile.

[0011] The piston is designed at the left end of the limit rod and is made into an integral body with the limit rod; the piston is used in conjunction with the hydraulic cylinder, installed in the hydraulic cylinder, in close contact with the inner wall of the hydraulic cylinder, and the piston can move left and right in the hydraulic cylinder.

[0012] The solenoid valve is designed on the left side of the upper end of the hydraulic cylinder and on the right side of the diaphragm 1; the solenoid valve is composed of an adsorption block, a push rod, a spring 1, an electromagnet, a sealing ring, a valve core, a valve seat, etc.; the sealing ring is sleeved on the push rod and is in close contact with the push rod, and the sealing ring is fixedly installed in the sealing ring mounting hole, and its function is to prevent the hydraulic oil from leaking into the solenoid valve; the electromagnet is installed on the outer wall of the hydraulic cylinder in the solenoid valve and directly below the adsorption block; the lower end of the adsorption block is connected to the upper end of the push rod, and is made into a whole with the upper end of the push rod; the lower end of the push rod passes through the hydraulic cylinder wall through the push rod through hole and is connected to the valve core; the valve core is designed in a hemispherical shape, the flat end on the top is connected to the push rod, and the hemispherical end on the bottom matches the outer contour of the valve seat, and the valve core The diameter is slightly larger than the diameter of the valve seat; the contour of the upper end of the valve seat is concave downward and matches the hemispherical outer contour of the lower end of the valve core. The valve seat and the inner wall of the hydraulic cylinder are designed as a whole, the upper end of which is connected to the hydraulic cylinder, and the lower end is connected to the variable volume oil storage tank through the main oil channel; the spring 1 is sleeved on the push rod, the upper end of which supports the adsorption block, and the lower end supports the outer wall of the hydraulic cylinder; under normal circumstances, the spring 1 separates the adsorption block and the electromagnet; when the solenoid valve is working, the adsorption block overcomes the elastic force of the spring 1 and pushes the valve core downward through the push rod, and the hemispherical end under the valve core can just be pressed against the valve seat and tightly combined with the valve seat, so that the hydraulic oil cannot flow into the main oil channel through the valve seat, so that the hydraulic oil can only flow into the main oil channel through the bypass hole.

[0013] The variable volume oil storage tank is composed of a diaphragm 2, an oil pan, and a main oil channel; the main oil channel is made into a whole with the valve seat and the oil pan; the diaphragm 2 is designed on the right side of the main oil channel and the upper part of the oil pan, and is tightly and fixedly connected with the oil pan and the main oil channel, so that the internal space from the lower end of the diaphragm 2 to the oil pan, the main oil channel, the diaphragm 1, the hydraulic cylinder, and the piston forms a sealed space completely isolated from the external environment, and the upper end of the diaphragm 2 is in contact with the air; the diaphragm 2 is made of soft material and has elasticity. It can bulge upward when the volume of the hydraulic oil in the tank increases, and can sink downward when the volume of the hydraulic oil in the tank decreases.

[0014] The characteristics of hydraulic oil are: the hydraulic oil is contained in a variable volume oil tank and fills the internal space between the variable volume oil tank, the main oil channel, the bypass hole, the diaphragm 1, the hydraulic cylinder, and the piston; the hydraulic oil is recommended to be moisture-proof, antifreeze, high temperature resistant, stable and long service life.

[0015] The present invention also utilizes infrared sensors to sense whether there is foreign matter between the vehicle door and the door frame; the infrared sensors are installed on the vehicle door and the door frame and connected to the control system, and the number, type, model, and specific installation position of the infrared sensors are determined according to the actual conditions of each manufacturer and each vehicle model.

[0016] The present invention also adds a safety reminder function. When the anti-pinch system is activated, the safety reminder function is activated and reminds the driver and passengers to remove foreign objects and pay attention to safety. The recommended reminder methods are: 1. Voice reminder: the anti-pinch system has been activated, please pay attention to safety. 2. Sound reminder: emit a special safety reminder sound; in addition, the resistance to closing the door suddenly increases, making the door almost impossible to close is also a reminder method of the safety reminder function.

[0017] The present invention can achieve the following effects: As a preferred embodiment, as shown in the attached Figure 3 As shown, during the door closing stroke, the limit rod pushes the piston to the left, and the hydraulic oil forms pressure on the diaphragm 1, so that the two contacts are combined and form a passage. The control system recognizes that this is the door closing stroke; at the same time, the hydraulic oil flows back to the variable volume oil storage tank through the valve seat and the bypass hole through the main oil channel. When the door is closed, if there is a foreign object between the door and the door frame (such as: human hands, clothes, seat belts, other items, etc.), the infrared sensor on the door and the door frame will sense the signal of the foreign object and transmit the signal to the control system. After receiving the signal, the control system quickly energizes the electromagnet in the solenoid valve, and the electromagnet generates suction. Under the action of the electromagnet suction, the adsorption block overcomes the elastic force of the spring 1 and pushes the valve core downward through the push rod and presses it against the valve seat, as shown in the attached figure. Figure 4 As shown, at this time, the hydraulic oil can only flow back to the variable volume oil storage tank through the bypass hole through the main oil channel. Since the diameter of the bypass hole is very small, the speed of the hydraulic oil flowing back to the variable volume oil storage tank suddenly slows down, so the speed of the limit pull rod moving to the left will be quickly slowed down, and the speed of the driver and passenger closing the door will be instantly reduced. The driver and passenger will feel that the resistance to closing the door suddenly becomes very large; at the same time, the safety reminder function is activated, and a safety reminder sound is issued to remind the driver and passenger to remove the foreign object and pay attention to safety. When the driver and passenger removes the foreign object between the door and the door frame, the infrared sensor on the door and the door frame will sense the signal that there is no foreign object, and transmit the signal to the control system. After receiving the signal, the control system quickly cuts off the power to the electromagnet in the solenoid valve, and the electromagnet suction disappears. Under the action of spring 1, the adsorption block pulls the valve core upward through the push rod and returns to its original position; at this time, the hydraulic oil can flow back to the variable volume oil storage tank through the valve seat and the bypass hole through the main oil channel, so the speed of the limit pull rod moving to the left returns to normal, and the driver and passenger can close the door normally. During the door opening stroke, the limit rod pushes the piston to the right, and the hydraulic pressure in the variable volume oil tank is sucked into the hydraulic cylinder through the main oil channel, the valve seat and the bypass hole. Figure 5 As shown, during the door opening stroke and when the door is stationary, since the hydraulic oil does not exert pressure on the diaphragm 1, the two contacts on the left side of the diaphragm 1 are not combined and no pathway is formed. The control system recognizes the door opening stroke or the door is stationary and the system does not energize the electromagnet. At this time, the driver and passengers can open the door normally and enter and exit the door normally, and the anti-pinch system will not be activated incorrectly.

[0018] The shapes, sizes, data, structural positions, etc. used in the embodiments of the present invention are all recommended preferred examples and do not represent the final results of the present invention. Ordinary technicians in this field can easily understand the spirit of the present invention and make different extensions and changes. Based on the technical solution ideas of the present invention, the expansions made and the replacement of operating methods and data are all within the protection scope of the present invention.

Claims

1. A door stopper with anti-pinch function, characterized in that: The structure includes a mounting seat, a limit box, a limit rod, a piston, a hydraulic cylinder, a solenoid valve, a variable volume oil storage tank, hydraulic oil, an infrared sensor, etc.; and also includes a safety reminder function.

2. A door stopper with anti-pinch function according to claim 1, characterized in that: The hydraulic cylinder is designed on the left side of the limit box and is integrated with the limit box. The upper end of the left side of the hydraulic cylinder is the solenoid valve. On the hydraulic cylinder wall just below the solenoid valve are the push rod through hole and the sealing ring installation hole; the push rod through hole is above the sealing ring installation hole, and its diameter is slightly larger than the diameter of the solenoid valve push rod; the sealing ring installation hole is below the push rod through hole, and its diameter is slightly larger than the diameter of the push rod through hole; on the inner wall of the hydraulic cylinder just below the sealing ring installation hole is the valve seat of the solenoid valve; the bypass hole is on the right side of the valve seat and is close to the valve seat. Its diameter is much smaller than that of the valve seat. The upper end of the bypass hole is connected to the hydraulic cylinder, and the lower end bypasses the valve seat to connect to the main oil channel; the left and right lengths from the bypass hole to the rightmost limit box in the hydraulic cylinder are slightly larger than the sum of the lengths of the limit rod and the piston; on the left side of the solenoid valve core and valve seat in the hydraulic cylinder is diaphragm 1. Diaphragm 1 is made of soft material and will deform to the left and right when subjected to liquid pressure. Diaphragm 1 and the hydraulic cylinder The inner wall is fixed and tightly connected, so that a sealed cavity is formed on the left side of the diaphragm 1; a contact and a spring 2 are designed in the sealed cavity, wherein the contact is divided into two, one contact is fixedly installed on the inner wall of the hydraulic cylinder at the leftmost end of the hydraulic cylinder, and another contact is fixedly installed on the left end of the diaphragm 1 opposite to the contact, and the springs are respectively sleeved on the two contacts and insulated from the two contacts, one end of which supports the inner wall of the hydraulic cylinder and the other end supports the diaphragm 1. Under normal action, the elastic force of the spring 2 can overcome the liquid pressure generated by the elastic force of the diaphragm 2 when the piston is at the leftmost position of the hydraulic cylinder, so that the two contacts will not contact under the action of the spring 2; the two contacts are connected to the control system, and when the two contacts are combined, a passage is formed, and the control system will recognize it as a door closing stroke; when the two contacts are not in contact, a circuit is formed, and the control system will recognize it as a door opening stroke or the door is immobile.

3. The door stopper with anti-pinch function according to claim 1, characterized in that: The piston is designed at the left end of the limit rod and is made into an integral body with the limit rod; the piston is used in conjunction with the hydraulic cylinder, installed in the hydraulic cylinder, in close contact with the inner wall of the hydraulic cylinder, and the piston can move left and right in the hydraulic cylinder.

4. The door stopper with anti-pinch function according to claim 1, characterized in that: The solenoid valve is designed on the left side of the upper end of the hydraulic cylinder and on the right side of the diaphragm 1; the solenoid valve is composed of an adsorption block, a push rod, a spring 1, an electromagnet, a sealing ring, a valve core, a valve seat, etc.; the sealing ring is sleeved on the push rod and is in close contact with the push rod, and the sealing ring is fixedly installed in the sealing ring mounting hole; the electromagnet is installed on the outer wall of the hydraulic cylinder in the solenoid valve and is directly below the adsorption block; the lower end of the adsorption block is connected to the upper end of the push rod, and is made into a whole with the upper end of the push rod; the lower end of the push rod passes through the hydraulic cylinder wall through the push rod through hole and is connected to the valve core; the valve core is designed to be hemispherical, the flat end on the top is connected to the push rod, and the hemispherical end on the bottom matches the outer contour of the valve seat, and the diameter of the valve core is smaller than the diameter of the valve seat Slightly larger; the contour of the upper end of the valve seat is concave downward and matches the hemispherical outer contour of the lower end of the valve core. The valve seat and the inner wall of the hydraulic cylinder are designed as a whole, the upper end of which is connected to the hydraulic cylinder, and the lower end is connected to the variable volume oil storage tank through the main oil channel; the spring 1 is sleeved on the push rod, the upper end of which supports the adsorption block, and the lower end supports the outer wall of the hydraulic cylinder; under normal circumstances, the spring 1 separates the adsorption block and the electromagnet; when the solenoid valve is working, the adsorption block overcomes the elastic force of the spring 1 and pushes the valve core downward through the push rod, and the hemispherical end under the valve core can just be pressed against the valve seat and tightly combined with the valve seat, so that the hydraulic oil cannot flow into the main oil channel through the valve seat, so that the hydraulic oil can only flow into the main oil channel through the bypass hole.

5. The door stopper with anti-pinch function according to claim 1, characterized in that: The variable volume oil storage tank is composed of a diaphragm 2, an oil pan, and a main oil channel; the main oil channel is made into a whole with the valve seat and the oil pan; the diaphragm 2 is designed on the right side of the main oil channel and the upper part of the oil pan, and is tightly and fixedly connected with the oil pan and the main oil channel, so that the internal space from the lower end of the diaphragm 2 to the oil pan, the main oil channel, the diaphragm 1, the hydraulic cylinder, and the piston forms a sealed space completely isolated from the external environment, and the upper end of the diaphragm 2 is in contact with the air; the diaphragm 2 is made of soft material and has elasticity. It can bulge upward when the volume of the hydraulic oil in the tank increases, and can sink downward when the volume of the hydraulic oil in the tank decreases.

6. The door stopper with anti-pinch function according to claim 1, characterized in that: The hydraulic oil is contained in a variable volume oil tank and fills the internal space between the variable volume oil tank, the main oil channel, the bypass hole, the diaphragm 1, the hydraulic cylinder, and the piston; the hydraulic oil is recommended to be moisture-proof, antifreeze, high temperature resistant, stable and long service life.

7. The door stopper with anti-pinch function according to claim 1, characterized in that: Infrared sensors are installed on vehicle doors and door frames and connected to the control system. The number, type, model and specific installation location of the infrared sensors are determined according to the actual conditions of each manufacturer and each vehicle model.

8. The door stopper with anti-pinch function according to claim 1, characterized in that: The safety reminder function is controlled by the control system. When the anti-pinch system is activated, the safety reminder function will be activated and remind the driver and passengers to remove foreign objects and pay attention to safety. The recommended reminder methods are:

1. Voice reminder: The anti-pinch system has been activated, please pay attention to safety; 2. Sound reminder: a special safety reminder sound is emitted; in addition, the resistance to closing the door suddenly increases, making the door almost impossible to close, which is also a reminder method of the safety reminder function.

9. The door stopper with anti-pinch function according to claim 1, characterized in that: It is recommended to install the door limiter near the door hinge. The mounting base is installed on the door frame through the mounting hole. One end of the limit box is installed on the door through the mounting bolt, and is movably connected to the pin of the mounting base through the pin mounting hole of the limit pull rod.

Images