Lifting hinge of explosion-proof safety door

Abstract

The utility model relates to a lifting hinge of an explosion-proof safety door, which comprises an upper hinge and a lower hinge, the upper hinge comprises an upper hinge sleeve and a hinge piece fixed on one side of the upper hinge sleeve, the lower hinge comprises a lower hinge connecting pipe and a hinge piece fixed on one side of the lower hinge connecting pipe, the top of the lower hinge connecting pipe is a fixed pipe, and the top of the lower hinge connecting pipe is a hollow pipe. The upper hinge sleeve and the fixing pipe are connected in an inserted mode to form rotating connection, and the opposite faces of the upper hinge sleeve and the lower hinge connecting pipe are spiral faces. Balls elastically connected through reset springs are arranged on the fixing pipe in the radial direction, the balls are provided with protruding surfaces protruding out of the outer circumferential face of the fixing pipe, and the protruding surfaces of the balls are in rolling contact with the interior of the upper hinge sleeve. A positioning shaft is arranged in the upper hinge sleeve and is axially connected with the fixing pipe in an inserted mode. And the balls are arranged on the fixed pipe and are in rolling contact with the interior of the sleeve of the upper hinge, so that the rotating resistance of the upper hinge and the lower hinge is reduced on the basis of ensuring the supporting stability and the rotating stability.

Description

Technical Field

[0001] The utility model relates to the field of civil air defense safety, in particular to a lifting hinge of an explosion-proof safety door. Background Art

[0002] Explosion-proof safety doors are special door bodies specially designed and installed at the entrances and exits of civil air defense projects (such as underground air-raid shelters, shelters, command centers, etc.). Their main function is to ensure the safety of personnel inside the project in wartime or emergency situations, such as air raids, explosion threats, chemical or biological attacks, etc., and to prevent external harmful factors such as shock waves, radioactive dust, chemical agents, etc. from invading the protected space.

[0003] In the prior art, in order to obtain an ideal safety protection effect, the overall thickness of the explosion-proof safety door is relatively large, so as to provide sufficient explosion-proof performance, resulting in a relatively large overall weight of the explosion-proof safety door. A large resistance will be generated during the rotation of the explosion-proof safety door, which will affect the opening and closing of the safety door, making the opening and closing of the safety door require a large thrust, making it more difficult to open and close.

[0004] Therefore, an explosion-proof safety door lifting hinge is proposed to solve the above problems. Summary of the invention

[0005] The utility model solves the defects of the existing explosion-proof safety door that it is heavy, requires a large thrust to open and close, and is difficult to open and close. It provides a lifting hinge for the explosion-proof safety door to reduce the resistance during the rotation of the explosion-proof safety door. The explosion-proof safety door can also provide auxiliary force for rotation when closing, thereby reducing the thrust required for closing the explosion-proof safety door.

[0006] The specific technical scheme of the utility model is: an explosion-proof safety door lifting hinge, including an upper hinge and a lower hinge, the upper hinge including an upper hinge sleeve and a hinge piece fixed to one side of the upper hinge sleeve, the lower hinge including a lower hinge connecting tube and a hinge piece fixed to one side of the lower hinge connecting tube, the top of the lower hinge connecting tube is a fixed tube, the upper hinge sleeve and the fixed tube are plugged into a rotating connection, and the opposite surfaces of the upper hinge sleeve and the lower hinge connecting tube are spiral surfaces; a ball connected by a reset spring is radially arranged on the fixed tube, the ball has a protruding surface protruding from the outer peripheral surface of the fixed tube, and the protruding surface of the ball forms a rolling contact with the inside of the upper hinge sleeve; a positioning shaft is arranged inside the upper hinge sleeve, and the positioning shaft is axially plugged into the fixed tube.

[0007] An explosion-proof safety door can select three or four hinges according to its size and weight. Each hinge includes an upper hinge and a lower hinge. The upper hinge and the lower hinge can rotate relative to each other around the same vertical axis. The hinge piece of the lower hinge is fixed to the side of the explosion-proof safety door, and the hinge piece of the upper hinge is fixed to the door frame of the explosion-proof safety door. The opposite surfaces of the upper hinge sleeve and the lower hinge connecting pipe are spiral surfaces. After the explosion-proof safety door is installed, the two spiral surfaces are in contact with each other and the upper hinge sleeve is supported by the spiral surface of the lower hinge connecting pipe. As the explosion-proof safety door rotates, the two contacting spiral surfaces rotate relative to each other, and then the explosion-proof safety door rises and falls. Generally, it descends when it is closed and rises when it is opened. In this way, the explosion-proof safety door can reduce the weight by its own gravity when it is closed. The thrust required for rotation facilitates the closing of the explosion-proof safety door and saves time, and it also has a certain hindering effect on the opening, thereby utilizing the deadweight of the explosion-proof safety door to play a certain protective role. In order to avoid the rotation and closing phenomenon due to deadweight when opening, the rotating outer edge of the explosion-proof safety door can be connected to the lock hook of the passage wall; during the rotation of the upper hinge relative to the lower hinge, in order to reduce the rotational resistance generated by the contact between the two, a ball is arranged on the fixed tube, and the ball forms a rolling contact with the inside of the upper hinge sleeve, thereby reducing the rotational resistance of the upper and lower hinges while ensuring the support stability and rotation stability; in order to avoid shaking after rising to the top, a positioning shaft is arranged inside the upper hinge sleeve, and the axial stability is maintained by axially plugging the positioning shaft with the fixed tube.

[0008] Preferably, an axial inner hole connected to the fixed tube is provided inside the upper hinge sleeve, the protruding surface of the ball rolls in contact with the inner wall of the axial inner hole, an axial socket is provided at the top axial center of the fixed tube, and the positioning shaft is connected to the axial socket.

[0009] Preferably, the inner diameter of the axial inner hole of the upper hinge sleeve is divided into three sections, the inner diameters of the upper section and the lower section are adapted to the outer diameter of the fixed tube, the inner diameter of the middle section is larger than the outer diameter of the fixed tube and forms a clearance fit with the fixed tube, the height of the middle section is larger than the pitch of the helical surface, and the ball is located in the middle section. The middle part inside the upper hinge sleeve is the middle section, the inner diameter of the middle section is large, and forms a clearance fit with the fixed tube, the outer wall of the fixed tube does not contact the inner wall of the middle section, thereby reducing the contact area between the outer surface of the fixed tube and the inner wall of the upper hinge sleeve, reducing friction, the inner diameter of the middle section is large, and balls are arranged on the outer surface of the fixed tube, so that under the action of the reset spring, the balls are located in the middle section, and the appropriate number of balls is selected according to the size of the force; in the process of opening and closing the explosion-proof safety door, in order to ensure that the balls work, the height of the middle section is larger than the pitch of the helical surface, and the pitch corresponds to the lifting height of the explosion-proof safety door.

[0010] Preferably, a cavity is arranged in the tube wall of the upper hinge sleeve, an oil inlet pipe communicating with the cavity is arranged on the outer wall of the upper hinge sleeve, an oil outlet hole communicating with the cavity is arranged on the inner wall of the upper hinge sleeve, and the oil inlet pipe is higher than the oil outlet hole. Lubricating oil is injected into the cavity through the oil inlet pipe, and the lubricating oil enters the gap between the fixed tube and the upper hinge sleeve through the oil outlet hole, so that the contact surface between the fixed tube and the upper hinge sleeve can be lubricated, thereby reducing the resistance of the upper hinge to rotate relative to the lower hinge.

[0011] Preferably, a radial circular hole is provided on the fixed tube, and the circular hole is connected to the interior of the fixed tube; the cavity in the upper hinge sleeve is located at one side of the top of the upper hinge sleeve, and the oil outlet holes are distributed circumferentially along the inner wall of the upper hinge sleeve. The circular hole on the fixed tube is connected to the axial jack inside the fixed shaft, and the contact surface between the fixed tube and the positioning shaft is lubricated to reduce the rotational resistance of the upper hinge relative to the lower hinge.

[0012] Preferably, a radial blind hole is provided on the fixed tube, the reset spring is provided in the radial blind hole, a movable block is provided in the radial blind hole, the movable block is fixed to the end of the reset spring, the ball is located outside the movable block, and the ball is in contact with the movable block.

[0013] Preferably, the spiral surface is respectively arranged on the lower end surface of the upper hinge sleeve and the upper end surface of the lower hinge connecting tube; the distribution angle of the spiral surface is 360°.

[0014] Preferably, a roller cone is arranged on the helical surface, and the axis of the roller cone is radially distributed relative to the rotation center of the hinge. The roller cone is arranged on the helical surface so that the helical surface of the upper hinge and the helical surface of the lower hinge form rolling contact, thereby reducing the resistance of the relative rotation of the two. In order to ensure the rotation stability of the upper hinge relative to the lower hinge, the roller cone can be used to match the rotation trajectory.

[0015] The beneficial effects of the utility model are as follows: 1. The surfaces facing each other of the upper hinge sleeve and the lower hinge connecting tube are spiral surfaces. After the explosion-proof safety door is installed, the two spiral surfaces are in relative contact with each other and the upper hinge sleeve is supported by the spiral surface of the lower hinge connecting tube. As the explosion-proof safety door rotates, the two contacting spiral surfaces rotate relative to each other, thereby causing the explosion-proof safety door to rise and fall.

[0016] 2. The explosion-proof safety door descends when it is closed. In this way, its own gravity can reduce the thrust required for rotation, making it easier to close the explosion-proof safety door and saving time. It can also hinder the opening of the door, thereby using the weight of the explosion-proof safety door to play a certain protective role.

[0017] 3. A ball bearing is arranged on the fixed tube, and the ball bearing forms rolling contact with the inner part of the upper hinge sleeve, thereby reducing the rotation resistance of the upper hinge and the lower hinge while ensuring the support stability and rotation stability;

[0018] 4. A positioning shaft is arranged inside the upper hinge sleeve, and the axial stability is maintained by axially plugging the positioning shaft with the fixed tube;

[0019] 5. A cavity is arranged in the tube wall of the upper hinge sleeve, and the cavity lubricates the contact surface between the inner wall of the upper hinge sleeve and the fixed tube through the oil outlet hole, thereby reducing the resistance of the upper hinge to rotate relative to the lower hinge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of the utility model;

[0021] Figure 2 This is a cross-sectional view of an upper hinge sleeve of the utility model;

[0022] Figure 3 This is an exploded schematic diagram of the upper hinge sleeve and the fixed pipe of the utility model;

[0023] Figure 4 This is a structural schematic diagram of a fixed pipe of the utility model;

[0024] In the figure: 1. lower hinge connecting pipe, 2. spiral surface, 3. fixed pipe, 4. upper hinge sleeve, 5. hinge piece, 6. plug, 7. oil inlet pipe, 8. cavity, 9. oil outlet hole, 10. ball bearing, 11. positioning shaft, 12. round hole, 13. upper section, 14. middle section, 15. lower section, 16. movable block, 17. return spring, 18. axial jack. DETAILED DESCRIPTION

[0025] The present invention will be further described below through specific embodiments in conjunction with the accompanying drawings. Example

[0026] like Figure 1 As shown, a lifting hinge of an explosion-proof safety door includes an upper hinge and a lower hinge. The upper hinge includes an upper hinge sleeve 4 and a hinge piece 5 fixed to one side of the upper hinge sleeve. The lower hinge includes a lower hinge connecting pipe 1 and a hinge piece 5 fixed to one side of the lower hinge connecting pipe. The top of the lower hinge connecting pipe is a fixed pipe 3. The upper hinge sleeve and the fixed pipe are plugged into each other to form a rotating connection. The surfaces opposite to the upper hinge sleeve and the lower hinge connecting pipe are spiral surfaces 2. An explosion-proof safety door selects three or four hinges according to the size and weight. The hinge piece of the lower hinge is fixed to the side of the explosion-proof safety door, and the hinge piece of the upper hinge is fixed to the door frame of the explosion-proof safety door. The spiral surfaces are respectively arranged on the lower end surface of the upper hinge sleeve and the upper end surface of the lower hinge connecting pipe, and the distribution angle of the spiral surfaces is 360°. An oil inlet pipe 7 is connected to the upper hinge sleeve, and a plug 6 is arranged at the oil inlet end of the oil inlet pipe.

[0027] like Figure 2 Figure 3As shown, the upper hinge sleeve is provided with an axial inner hole plugged into the fixed tube. The inner diameter of the axial inner hole of the upper hinge sleeve is divided into three sections. The inner diameters of the upper section 13 and the lower section 15 are adapted to the outer diameter of the fixed tube. The inner diameter of the middle section 14 is larger than the outer diameter of the fixed tube and forms a clearance fit with the fixed tube. The height of the middle section is larger than the pitch of the helical surface. A cavity 8 is provided in the tube wall of the upper hinge sleeve. The position of the cavity is biased towards the upper section and extends to the upper part of the middle section. The cavity is connected to the oil inlet pipe. An oil outlet hole 9 connected to the cavity is provided on the inner wall of the upper hinge sleeve. The oil outlet hole is lower than the oil inlet pipe. There are multiple oil outlet holes, which are divided into upper and lower rows, and each row has four oil outlet holes distributed circumferentially. The oil outlet holes in the upper row are located at the upper section of the axial inner hole, and the oil outlet holes in the lower row are located at the upper part of the middle section of the axial inner hole.

[0028] A square radial blind hole is provided on the fixed tube, and a reset spring 17, a movable block 16 and a ball 10 are provided in the radial blind hole. One side surface of the movable block is fixed to one end of the reset spring, and the other end of the reset spring is in contact with the bottom of the radial blind hole. The movable block can move in the radial blind hole, and the ball is embedded in the movable block and can rotate freely in the movable block. The ball faces the opening position of the radial blind hole, and the ball has a protruding surface protruding from the outer peripheral surface of the fixed tube. The radial blind holes on the fixed tube are arranged in multiple rows and columns (only two opposite ones are shown in the figure). The fixed tube is inserted into the axial inner hole of the upper hinge sleeve, and the protruding surface of the ball forms a rolling contact with the hole wall of the axial inner hole. An axial plug hole 18 is provided on the top of the fixed tube, and the axial plug hole is located at the axial position of the fixed tube. A radial circular hole 12 is also provided on the fixed tube, and the circular hole avoids the radial blind hole, and the circular hole is connected with the axial plug hole, and the circular hole is located in the middle position of the axial plug hole. A positioning shaft 11 is provided at the bottom of the axial inner hole of the upper hinge sleeve, and the positioning shaft is plug-fitted with the axial plug hole on the fixing tube.

[0029] The surfaces of the upper hinge sleeve and the lower hinge connecting tube facing each other are spiral surfaces, so an axial plane is formed at the end of the spiral surface, and a buffer pad is fixed on the axial plane. After the upper hinge rotates relative to the lower hinge and falls into place, the buffer pad on the axial plane of the upper hinge sleeve contacts the buffer pad on the axial plane of the lower hinge connecting tube.

[0030] Oil is injected into the cavity through the oil inlet pipe, and the oil inlet pipe is sealed by the plug after oil injection, and at the same time, the oil inlet pipe is prevented from being blocked by dust and the like. The lubricating oil in the cavity penetrates into the gap between the fixed tube and the inner wall of the upper hinge sleeve through the oil outlet hole, lubricating the upper and middle sections of the axial inner holes of the fixed tube and the upper hinge sleeve, and lubricating the radial blind hole to facilitate the movement of the movable block and the rolling of the ball. The lubricating oil penetrates into the axial socket through the round hole, and lubricates the positioning shaft and the inner wall of the axial socket. Normally, the explosion-proof safety door is in the open state. At this time, the explosion-proof safety door is connected to the channel wall lock hook through the outer edge. At this time, the upper hinge is vertical relative to the lower hinge, the upper hinge and the lower hinge are at the maximum height, and the shaft end of the positioning shaft is in the axial socket of the fixed tube. In an emergency, the lock hook between the explosion-proof safety door and the passage wall separates, pushing the explosion-proof safety door to rotate. At the same time, due to the inclined force of the spiral surface, the explosion-proof safety door has a tendency to rotate. As the explosion-proof safety door rotates, the upper hinge gradually drops relative to the lower hinge, and the explosion-proof safety door gradually drops until the explosion-proof safety door is closed and the upper hinge drops into place. During the rotation of the upper hinge relative to the lower hinge, the ball is in rolling contact with the inner wall of the middle section of the axial inner hole of the upper hinge sleeve, and at the same time, it is lubricated by lubricating oil, thereby reducing the resistance during the rotation process, reducing the thrust required when the explosion-proof safety door is closed, and enabling a quick response.

[0031] The above description is only a preferred embodiment of the present invention and does not constitute any limitation to the present invention. Any simple modification, change and equivalent transformation made to the above embodiments according to the technical essence of the present invention shall still fall within the protection scope of the technical solution of the present invention.

Claims

1. An explosion-proof safety door lifting hinge, characterized in that: The invention comprises an upper hinge and a lower hinge, wherein the upper hinge comprises an upper hinge sleeve (4) and a hinge plate (5) fixed to one side of the upper hinge sleeve, and the lower hinge comprises a lower hinge connecting tube (1) and a hinge plate fixed to one side of the lower hinge connecting tube, the top of the lower hinge connecting tube is a fixed tube (3), the upper hinge sleeve and the fixed tube are plugged into each other to form a rotational connection, and the surfaces of the upper hinge sleeve and the lower hinge connecting tube facing each other are spiral surfaces (2); a ball (10) connected via a return spring (17) is radially arranged on the fixed tube, the ball having a protruding surface protruding from the outer peripheral surface of the fixed tube, and the protruding surface of the ball forms rolling contact with the interior of the upper hinge sleeve; A positioning shaft (11) is arranged inside the upper hinge sleeve, and the positioning shaft is axially plugged into the fixed tube.

2. The explosion-proof safety door lifting hinge according to claim 1, characterized in that: An axial inner hole plugged into the fixed tube is arranged inside the upper hinge sleeve, the protruding surface of the ball rollingly contacts the inner wall of the axial inner hole, an axial plug hole (18) is arranged at the top axial center of the fixed tube, and the positioning shaft is plugged into the axial plug hole.

3. The explosion-proof safety door lifting hinge according to claim 2, characterized in that: The inner diameter of the axial inner hole of the upper hinge sleeve is divided into three sections. The inner diameters of the upper section (13) and the lower section (15) are adapted to the outer diameter of the fixed tube. The inner diameter of the middle section (14) is larger than the outer diameter of the fixed tube and forms a clearance fit with the fixed tube. The height of the middle section is larger than the pitch of the helical surface, and the ball is located in the middle section.

4. An explosion-proof safety door lifting hinge according to claim 1, 2 or 3, characterized in that: A cavity (8) is provided in the wall of the upper hinge sleeve, an oil inlet pipe (7) communicating with the cavity is provided on the outer wall of the upper hinge sleeve, and an oil outlet hole (9) communicating with the cavity is provided on the inner wall of the upper hinge sleeve, wherein the oil inlet pipe is higher than the oil outlet hole.

5. The explosion-proof safety door lifting hinge according to claim 4, characterized in that: The fixed tube is provided with a radial circular hole (12), which is connected to the interior of the fixed tube; the cavity in the upper hinge sleeve is located on one side of the top of the upper hinge sleeve, and the oil outlet holes are distributed circumferentially along the inner wall of the upper hinge sleeve.

6. An explosion-proof safety door lifting hinge according to claim 1 or 2, characterized in that: A radial blind hole is provided on the fixed tube, the reset spring is provided in the radial blind hole, a movable block (16) is provided in the radial blind hole, the movable block is fixed to the end of the reset spring, the ball is located outside the movable block, and the ball contacts the movable block.

7. The explosion-proof safety door lifting hinge according to claim 1, characterized in that: The spiral surfaces are respectively arranged on the lower end surface of the upper hinge sleeve and the upper end surface of the lower hinge connecting pipe; the distribution angle of the spiral surfaces is 360 degrees.

8. An explosion-proof safety door lifting hinge according to claim 1 or 7, characterized in that: A rolling cone is arranged on the spiral surface, and the axis of the rolling cone is radially distributed relative to the rotation center of the hinge.

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