A buffer with a one-way buffer tube structure and an elevator

Abstract

The application relates to the elevator technology field and discloses a buffer with a one-way buffer pipe structure and an elevator, which comprises a buffer oil cylinder, a one-way buffer pipe and a buffer device. The buffer oil cylinder comprises a cylinder body provided with a piston and a buffer pressure rod connected to the piston, the cylinder body is provided with a buffer cavity for containing hydraulic oil, the buffer pressure rod can drive the piston to make reciprocating stretching and retracting motion relative to the cylinder body, and the cylinder body is further provided with an oil conveying hole communicating with the buffer cavity; the one-way buffer pipe is provided with a buffer inlet and a buffer outlet, and the buffer inlet communicates with the oil conveying hole; and the buffer device comprises a buffer cavity, the buffer cavity communicates with the buffer outlet, and the buffer cavity is used for buffering the hydraulic oil flowing out through the oil conveying hole and the one-way buffer pipe. The buffer is not prone to aging, has good universality, can absorb the instantaneous impact force when the car falls to the ground, and reduces the damage of the impact force to the car.

Description

Technical Field

[0001] This invention relates to the field of elevator technology, and in particular to a buffer and elevator with a unidirectional buffer tube structure. Background Technology

[0002] Elevator buffers belong to the field of elevator safety protection technology. As the last line of defense for elevator safety, the buffer is also a safety clamp. Even if the elevator steel cable breaks, the safety clamp will activate to protect the elevator car after the elevator falls beyond the rated speed.

[0003] When the safety brake fails to engage or fails to engage effectively for some reason, the elevator car falls freely down the guide rail under the guidance of the guide shoes. When the bottom of the car hits the buffer installed at the bottom pit, the buffer absorbs the instantaneous impact force of the car and reduces the damage to the car.

[0004] Among existing technologies, polyurethane buffers are commonly used. The disadvantages of polyurethane buffers are: the aging problem inherent in the polyurethane material used; the difficulty in guaranteeing the quality of polyurethane buffers; the inability to promptly identify aging issues during use; and the fact that polyurethane buffers are only suitable for elevators with a rated speed of less than 1.0 m / s.

[0005] Therefore, there is an urgent need to provide a buffer and elevator with a unidirectional buffer tube structure, which is not prone to aging, has good versatility, and can absorb the instantaneous impact force when the car falls to the ground, reducing the damage to the car caused by the impact force. Summary of the Invention

[0006] Based on the above, the purpose of this invention is to provide a buffer and elevator with a unidirectional buffer tube structure, which is not prone to aging, has good versatility, and can absorb the instantaneous impact force when the car falls to the ground, reducing the damage to the car caused by the impact force.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] The first aspect of this application provides a buffer with a unidirectional buffer tube structure, comprising:

[0009] A buffer cylinder includes a cylinder body with a piston and a buffer rod connected to the piston. The cylinder body has a buffer chamber for containing hydraulic oil. The buffer rod can drive the piston to perform reciprocating stretching and retracting movements relative to the cylinder body. The cylinder body also has an oil supply hole communicating with the buffer chamber.

[0010] A one-way buffer tube has a buffer inlet and a buffer outlet, wherein the buffer inlet is connected to the oil delivery hole;

[0011] The buffer device includes a buffer chamber connected to the buffer outlet, and the buffer chamber is used to buffer the hydraulic oil flowing out through the oil supply hole and the one-way buffer pipe.

[0012] In some embodiments, the buffer with a unidirectional buffer tube structure further includes:

[0013] Switch bumper;

[0014] A limit switch, wherein the switch stop plate is configured to move relative to the limit switch, and the switch stop plate is configured to withstand an impact force to disconnect the limit switch; and / or,

[0015] The buffer with a unidirectional buffer tube structure further includes a controller, a speed sensor for detecting the retraction speed of the buffer rod, and a switch control valve installed at the buffer inlet. The switch control valve is a normally open valve. The switch control valve and the speed sensor are electrically connected to the controller. The controller is configured to dynamically control the opening of the switch control valve based on the speed of the buffer rod fed back by the speed sensor. When the speed of the buffer rod is greater than a first preset speed, the valve is fully open; when the speed of the buffer rod is greater than a second preset speed, the valve is partially open. The first preset speed is greater than the second preset speed. The controller is signal-connected to the limit switch. Under normal conditions, the controller is de-energized and does not work. In the event of a fall accident, the controller, the speed sensor, and the switch control valve are energized by receiving a signal from the limit switch.

[0016] In some embodiments, the switch stop plate is fixed to the buffer rod, and the limit switch has a contact head configured to perform the disconnection movement by abutting against the switch stop plate.

[0017] In some embodiments, the unidirectional buffer tubes include multiple tubes connected in parallel between the buffer cylinder and the buffer device.

[0018] In some embodiments, the buffer cylinder further includes:

[0019] A compression spring is sleeved on the buffer rod, and the compression spring is configured to push the buffer rod to perform a tensile and restoring motion.

[0020] In some embodiments, the buffer cylinder is configured vertically above the buffer device, and the buffer with a unidirectional buffer tube structure further includes:

[0021] A flow guide tube is disposed within the buffer device, with one end of the flow guide tube connected to the bottom of the buffer cavity and the other end connected to the buffer outlet.

[0022] In some embodiments, the buffer cylinder is configured vertically below the buffer device, such that the buffer device flows into the buffer cylinder by gravity; and / or,

[0023] The buffer device is a sealed reflux cylinder.

[0024] In some embodiments, the unidirectional buffer tube includes multiple valve tube segments connected in series, each valve tube segment including a main pipeline and a valve return pipeline connected in parallel with the main pipeline.

[0025] In the direction from the buffer inlet to the buffer outlet, one end of the main pipeline is the inlet and the other end is the outlet. One end of the valve return pipeline is connected to the inlet and the other end is connected to the outlet. The liquid outflow direction of the valve return pipeline connected to the outlet is different from the liquid outflow direction of the outlet of the main pipeline to form buffer turbulence.

[0026] In some embodiments, the main pipeline includes a first oil pipe segment, a second oil pipe segment, a third oil pipe segment, a fifth oil pipe segment, a sixth oil pipe segment, a seventh oil pipe segment, a ninth oil pipe segment, a tenth oil pipe segment, an eleventh oil pipe segment, a twelfth oil pipe segment, a thirteenth oil pipe segment, and a fifteenth oil pipe segment connected in sequence, and the valve return pipeline includes a fourth oil pipe segment, an eighth oil pipe segment, and a fourteenth oil pipe segment;

[0027] Hydraulic oil flowing in from the first oil pipe section is diverted at the second oil pipe section to the third and fourth oil pipe sections. Flowing along a certain arc in the fourth oil pipe section to the fifth oil pipe section, it counteracts the hydraulic oil flowing out of the third oil pipe section. The remaining hydraulic oil after this counteracting flow through the sixth oil pipe section and then through the seventh oil pipe section to the eighth and ninth oil pipe sections. Flowing through an arc-shaped channel in the eighth oil pipe section, it merges with the hydraulic oil from the ninth oil pipe section at the tenth oil pipe section, generating a counteracting force in opposite directions. The remaining hydraulic oil after this counteracting flow through the eleventh oil pipe section and then diverts at the twelfth oil pipe section to the thirteenth and fourteenth oil pipe sections. Flowing through an arc-shaped channel in the fourteenth oil pipe section, it merges with the hydraulic oil from the thirteenth oil pipe section at the fifteenth oil pipe section.

[0028] A second aspect of this application provides an elevator, comprising:

[0029] Lifting equipment;

[0030] A transmission device, connected to the lifting equipment, is used to drive the lifting equipment to perform lifting movements;

[0031] The safety device includes a buffer with a unidirectional buffer tube structure as mentioned in any of the preceding embodiments, the buffer with the unidirectional buffer tube structure being configured to cushion the lifting device from fall.

[0032] The beneficial effects of this invention are as follows:

[0033] The buffer with a one-way buffer tube structure and the elevator with the buffer of the present invention differ from existing structures. The buffer with the one-way buffer tube structure includes a buffer cylinder, a one-way buffer tube, and a buffer device. The buffer cylinder includes a cylinder body with a piston and a buffer rod connected to the piston. The cylinder body has a buffer chamber for containing hydraulic oil. The buffer rod can drive the piston to reciprocate in a stretching and retracting motion relative to the cylinder body. The cylinder body also has an oil inlet communicating with the buffer chamber. The one-way buffer tube has a buffer inlet and a buffer outlet, and the buffer inlet communicates with the oil inlet. The buffer device includes a buffer chamber communicating with the buffer outlet. The buffer chamber is used to buffer the hydraulic oil flowing out through the oil inlet and the one-way buffer tube. It effectively utilizes the unidirectional flow and reverse flow restriction characteristics of the unidirectional buffer tube, realizing the unidirectional buffer tube buffer when the buffer rod is subjected to high-speed impact and retracts. At the same time, the buffer device can buffer the hydraulic oil that is pressed in, thus realizing the repeated use of hydraulic oil. It can be widely used for buffer protection when elevators fall, and can absorb the instantaneous impact force when the car falls to the ground, reducing the impact force damage to the car. It is not easy to age, and the structure of the unidirectional buffer tube can be flexibly set according to different buffer needs, with good versatility. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0035] Figure 1 A schematic diagram of a buffer with a unidirectional buffer tube structure provided for an embodiment of the present invention;

[0036] Figure 2 A schematic diagram of the fully compressed hydraulic oil state of a buffer with a unidirectional buffer tube structure provided for an embodiment of the present invention.

[0037] Figure 3 A schematic diagram illustrating the intermediate process of resetting the buffer rod of a buffer with a unidirectional buffer tube structure provided for an embodiment of the present invention;

[0038] Figure 4 A schematic diagram of hydraulic oil flowing through the unidirectional buffer tube during the buffering process of a buffer with a unidirectional buffer tube structure provided for an embodiment of the present invention.

[0039] Figure 5 A schematic diagram of the backflow situation of a buffer with a unidirectional buffer tube structure provided for an embodiment of the present invention;

[0040] Figure 6 A schematic diagram of a buffer with a unidirectional buffer tube structure provided for another embodiment of the present invention.

[0041] In the picture:

[0042] X, Vertical direction; 1. Buffer cylinder; 11. Piston; 12. Cylinder body; 13. Buffer rod; 14. Buffer chamber; 15. Oil inlet; 2. One-way buffer pipe; 21. Buffer inlet; 22. Buffer outlet; 3. Buffer device; 31. Buffer chamber; 4. Switch plate; 5. Limit switch; 51. Contact head; 6. Compression spring; 7. Guide pipe; 8. Speed ​​sensor; 9. Switch control valve; 10. Controller.

[0043] 101. First oil pipeline section; 102. Second oil pipeline section; 103. Third oil pipeline section; 104. Fourth oil pipeline section; 105. Fifth oil pipeline section; 106. Sixth oil pipeline section; 107. Seventh oil pipeline section; 108. Eighth oil pipeline section; 109. Ninth oil pipeline section; 110. Tenth oil pipeline section; 111. Eleventh oil pipeline section; 112. Twelfth oil pipeline section; 113. Thirteenth oil pipeline section; 114. Fourteenth oil pipeline section; 115. Fifteenth oil pipeline section;

[0044] 201. First reflux section; 202. Second reflux section; 203. Third reflux section; 204. Fourth reflux section; 205. Fifth reflux section; 206. Sixth reflux section; 207. Seventh reflux section; 208. Eighth reflux section; 209. Ninth reflux section; 210. Tenth reflux section; 211. Eleventh reflux section; 212. Twelfth reflux section; 213. Thirteenth reflux section; 214. Fourteenth reflux section. Detailed Implementation

[0045] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0046] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0047] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0048] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0049] This application provides a buffer with a one-way buffer tube structure, and also provides an elevator with the buffer having the one-way buffer tube structure, including a lifting device, a transmission device, and a safety device; the lifting device can be a car. The transmission device is connected to the lifting device and is used to drive the lifting device to perform lifting movements; the safety device includes the buffer with a one-way buffer tube structure as mentioned in any of the above embodiments, and the buffer with the one-way buffer tube structure is configured to buffer the lifting device from falls. The buffer with the one-way buffer tube structure can be installed at the bottom of the elevator shaft.

[0050] For details, please refer to Figure 1-3The buffer with a one-way buffer tube structure includes a buffer cylinder 1, a one-way buffer tube 2, and a buffer device 3. The buffer cylinder 1 includes a cylinder body 12 with a piston 11 and a buffer rod 13 connected to the piston 11. The cylinder body 12 has a buffer chamber 14 for containing hydraulic oil. The buffer rod 13 can drive the piston 11 to reciprocate and retract relative to the cylinder body 12. The cylinder body 12 also has an oil supply hole 15 communicating with the buffer chamber 14. The one-way buffer tube 2 has a buffer inlet 21 and a buffer outlet 22, and the buffer inlet 21 communicates with the oil supply hole 15. The buffer device 3 includes a buffer chamber 31, which communicates with the buffer outlet 22. The buffer chamber 31 is used to buffer the hydraulic oil flowing out through the oil supply hole 15 and the one-way buffer tube 2.

[0051] The implementation method of this application effectively utilizes the unidirectional flow and reverse flow restriction characteristics of the unidirectional buffer tube 2, realizing the buffering of the unidirectional buffer tube 2 when the buffer rod 13 is subjected to high-speed impact and retracts. At the same time, the buffer device 3 can buffer the hydraulic oil that is pressed in, thereby realizing the repeated use of hydraulic oil. It can be widely used for buffer protection when the elevator falls, and can absorb the instantaneous impact force when the car falls to the ground, reduce the damage of the impact force to the car, is not easy to age, and can flexibly set the structure of the unidirectional buffer tube 2 according to different buffering needs, with good versatility.

[0052] In some implementations, reference Figure 1-3 The buffer with a unidirectional buffer tube structure also includes a switch plate 4 and a limit switch 5; the switch plate 4 is configured to switch relative to the limit switch 5, and the switch plate 4 is configured to withstand the impact thrust in order to disconnect the limit switch 5.

[0053] Specifically, in some implementation methods, refer to Figure 1-3 The switch plate 4 is fixed to the buffer rod 13, and the limit switch 5 has a contact head 51, which is configured to disconnect by abutting against the switch plate 4. More specifically, the switch plate 4 includes a first plate extending vertically, i.e., the X direction in the figure. The top of the first plate is fixedly connected to the top of the buffer rod 13, and the bottom of the first plate is connected to a second plate. The second plate is an inclined plate with a certain angle of inclination relative to the first plate, and the end of the second plate away from the first plate is closer to the cylinder 12. At the same time, the limit switch 5 is located on one side of the cylinder 12, and the contact head 51 will disconnect when subjected to horizontal pressure perpendicular to the vertical direction. Specifically, when the buffer rod 13 is subjected to impact pressure and retracts vertically, the second plate will abut against the contact head 51 during the synchronous descent. Since the second plate is an inclined sliding plate, the contact head 51 will be subjected to horizontal pressure and thus undergo compression until the contact head 51 slides to the limit position of the compression movement of the first plate, forming the disconnection process of the contact head 51.

[0054] Furthermore, in some embodiments, the unidirectional buffer tube 2 comprises multiple tubes, which are connected in parallel between the buffer cylinder 1 and the buffer device 3. Designing multiple unidirectional buffer tubes 2 facilitates individual miniaturization and allows for adjustment of the buffering effect by flexibly adjusting the number of tubes 2. Furthermore, in some embodiments, the buffer inlet 21 and buffer outlet 22 of each unidirectional buffer tube 2 can be detachably fitted with sealing plugs, allowing for flexible adjustment of whether the corresponding unidirectional buffer tube 2 is opened or blocked as needed.

[0055] Furthermore, in some implementations, reference is made to... Figure 1-3 The buffer cylinder 1 also includes a compression spring 6, which is sleeved on the buffer rod 13. The compression spring 6 is configured to push the buffer rod 13 to perform a tensile reset movement. When the buffer rod 13 no longer bears the load, it can rely on the elastic restoring force of the compression spring 6 to reset to the tensile state.

[0056] Furthermore, in some implementation methods, reference is made to Figure 1-3 Along the vertical direction X, the buffer cylinder 1 is positioned above the buffer device 3. The buffer with a one-way buffer tube structure also includes a guide pipe 7 disposed within the buffer device 3. One end of the guide pipe 7 connects to the bottom of the buffer chamber 14, and the other end connects to the buffer outlet 22. This allows for better re-drawing of hydraulic oil back into the buffer cylinder 1. Of course, in other embodiments, along the vertical direction X, the buffer cylinder 1 is positioned below the buffer device 3, allowing the buffer device 3 to flow into the buffer cylinder 1 by gravity. Regardless of whether it is positioned above or below, the buffer cylinder 1 can conceive of the aforementioned compression spring 6 to assist the buffer lever 13 in returning to its stretched state.

[0057] In some other implementations, reference is made to Figure 1-3 The buffer device 3 is a sealed reflux cylinder, which can also rely on the internal high pressure generated after compression to help the buffer rod 13 return to the stretched state.

[0058] Specifically, in some implementation methods, refer to Figure 1-3 The unidirectional buffer tube 2 includes multiple valve tube segments connected in series. Each valve tube segment includes a main pipeline and a valve return pipeline connected in parallel with the main pipeline. In the direction from the buffer inlet 21 to the buffer outlet 22, one end of the main pipeline is the inlet and the other end is the outlet. One end of the valve return pipeline is connected to the inlet and the other end is connected to the outlet. The discharge direction of the valve return pipeline at the outlet is different from that of the outlet of the main pipeline to form buffer turbulence, thereby achieving the effect of hydraulic buffering.

[0059] For more specific details, please refer to Figure 4 To illustrate the specific principle of hydraulic oil flow through the one-way buffer pipe 2 during the buffering process, when hydraulic oil flows in from the first oil pipe section 101, it is split into the third oil pipe section 103 and the fourth oil pipe section 104 at the second oil pipe section 102. At this split, the speed resistance of the hydraulic oil is minimal or essentially unchanged. When the fourth oil pipe section 104 curves to the fifth oil pipe section 105, it experiences a counterforce in the direction of the third oil pipe section 103, which cancels out some energy, thus generating some resistance. At this point, the fifth oil pipe section 105 performs a first-stage deceleration. After the counterforce, the remaining hydraulic oil flows through the sixth oil pipe section 106 and then splits again at the seventh oil pipe section 107, becoming the eighth oil pipe section 108 and the ninth oil pipe section 109. At this split, the speed assistance of the hydraulic oil is minimal or essentially unchanged. The eighth oil pipe section 108 flows through an arc-shaped channel and then connects with the ninth oil pipe section 109. The hydraulic oil converges at the tenth oil pipe segment 110. Here, the eighth oil pipe segment 108 generates a counteracting force in the opposite direction to the ninth oil pipe segment 109, which cancels out most of the hydraulic oil flow. The tenth oil pipe segment 110 performs a second-stage deceleration, which cancels out some energy, thus generating some resistance. After the counteracting, the remaining hydraulic oil flows through the eleventh oil pipe segment 111 and then splits again at the twelfth oil pipe segment 112, where it splits into the thirteenth oil pipe segment 113 and the fourteenth oil pipe segment 114. The split here has little or no effect on the speed of the hydraulic oil. After the fourteenth oil pipe segment 114 flows through the arc-shaped channel, it merges with the hydraulic oil in the thirteenth oil pipe segment 113 channel at the fifteenth oil pipe segment 115. Here, the fourteenth oil pipe segment 114 generates a counteracting force in the opposite direction to the thirteenth oil pipe segment 113, which cancels out most of the hydraulic oil flow. The fifteenth oil pipe segment 115 performs a third-stage deceleration.

[0060] This entire process is the compression and deceleration process of hydraulic oil passing through the one-way buffer pipe 2. This process requires specific quantitative adjustment parameters based on the actual rated load and rated speed. The remaining flow rate of the counterforce, the width and number of channels can be adjusted by adjusting the size ratio of the diversion port, the channel slope at the confluence point, etc.

[0061] refer to Figure 5When hydraulic oil flows in from the first return section 201, it splits into the second return section 202 and the third return section 203. At this point, the speed and resistance of the hydraulic oil are very small or basically unchanged. The two channels converge at the fourth return section 204. Here, there are no opposing forces, and the hydraulic oil in the two channels generates a resultant force. That is, the kinetic energy of the hydraulic oil at the fourth return section 204 is basically the same as that at the first return section 201. It flows without resistance through the fifth return section 205 and splits at the sixth return section 206. At this point, a small portion flows through the eighth return section 208, while most flows straight through the seventh return section 207 and then into the ninth return section. The hydraulic fluids converge at section 209, where there are no opposing forces between the two channels. The hydraulic fluids in the two channels generate a resultant force, meaning the kinetic energy of the hydraulic fluid at the ninth return section 209 is basically the same as that at the first return section 201. After passing through the tenth return section 210 without resistance, the fluid splits at the eleventh return section 211. At this point, a small portion flows through the twelfth return section 212, while most flows straight through the thirteenth return section 213 and converges at the fourteenth return section 214. Here, there are no opposing forces between the two channels, and the hydraulic fluids in the two channels generate a resultant force. That is, the kinetic energy of the hydraulic fluid at the fourteenth return section 214 is basically the same as that at the first return section 201.

[0062] That is, when the hydraulic oil flows back, there is no resistance. After the upper pressure is removed, the hydraulic oil in the buffer device 3 flows back into the cylinder 12 automatically under the action of atmospheric pressure in the cylinder, or under the action of negative pressure in the cavity generated when the compression spring is reset, or under the action of its own gravity in some embodiments. The piston 11, buffer rod 13, switch plate 4, and limit switch 5 are automatically reset.

[0063] Furthermore, in some implementations, reference is made to... Figure 6 The buffer with a unidirectional buffer tube structure may also include a speed sensor 8 for detecting the retraction speed of the buffer rod 13. A switch control valve 9, which adjusts the opening of the buffer inlet 21, can be installed at the buffer inlet 21 of the unidirectional buffer tube 2. The switch control valve 9 is a normally open valve. The switch control valve 9 and the speed sensor 8 are electrically connected to the controller 10. The controller 10 is configured to dynamically control the opening of the switch control valve 9 based on the speed of the buffer rod 13 fed back by the speed sensor 8, thereby dynamically adjusting the buffering performance of the buffer with the unidirectional buffer tube structure. For example, when the speed of the buffer rod 13 is greater than a first preset speed, the opening is fully open; when the speed of the buffer rod 13 is greater than a second preset speed, the opening is half-open. The first preset speed is greater than the second preset speed, forming a two-stage controlled buffer. That is, it is fully open when the speed is high and the opening is reduced when the speed is low to maintain good buffering performance. More detailed designs can be made with more opening controls to achieve three-stage or more levels of controlled buffering, making it more flexible.

[0064] Further, refer to Figure 6The controller 10 can be connected to the limit switch 5. Under normal conditions, the controller 10 is de-energized and does not work. When a fall accident occurs, the controller 10, speed sensor 8 and switch control valve 9 are energized by receiving the signal from the limit switch 5, thereby achieving high efficiency and energy saving.

[0065] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A buffer with a unidirectional buffer tube structure, characterized in that, include: A buffer cylinder (1) includes a cylinder body (12) with a piston (11) and a buffer rod (13) connected to the piston (11). The cylinder body (12) has a buffer chamber (14) for containing hydraulic oil. The buffer rod (13) can drive the piston (11) to reciprocate the stretching and retracting motion relative to the cylinder body (12). The cylinder body (12) also has an oil supply hole (15) communicating with the buffer chamber (14). A one-way buffer tube (2) has a buffer inlet (21) and a buffer outlet (22). The buffer inlet (21) is connected to the oil inlet (15). The one-way buffer tube (2) includes multiple valve tube segments connected in series. Each valve tube segment includes a main pipeline and a valve return pipeline connected in parallel with the main pipeline. In the direction from the buffer inlet (21) to the buffer outlet (22), one end of the main pipeline is the inlet and the other end is the outlet. One end of the valve return pipeline is connected to the inlet and the other end is connected to the outlet. The liquid outlet direction of the valve return pipeline connected to the outlet is different from the liquid outlet direction of the main pipeline to form buffer turbulence. The buffer device (3) includes a buffer chamber (31) which is connected to the buffer outlet (22). The buffer chamber (31) is used to buffer the hydraulic oil flowing out through the oil supply hole (15) and the one-way buffer pipe (2).

2. The buffer with a unidirectional buffer tube structure according to claim 1, characterized in that, Also includes: Switch stop plate (4); Limit switch (5), the switch plate (4) is configured to perform switching motion relative to the limit switch (5), the switch plate (4) is configured to withstand impact thrust to perform disconnecting motion of the limit switch (5).

3. The buffer with a unidirectional buffer tube structure according to claim 2, characterized in that, The switch plate (4) is fixed to the buffer rod (13), and the limit switch (5) has a contact head (51) configured to perform the disconnection movement by abutting against the switch plate (4); and / or, The buffer with a unidirectional buffer tube structure further includes a controller (10), a speed sensor (8) for detecting the retraction speed of the buffer rod (13), and a switch control valve (9) installed at the buffer inlet (21). The switch control valve (9) is a normally open valve. The switch control valve (9) and the speed sensor (8) are electrically connected to the controller (10), respectively. The controller (10) is configured to dynamically control the switch control valve based on the speed of the buffer rod (13) fed back by the speed sensor (8). The opening degree of (9) is as follows: when the speed of the buffer rod (13) is greater than the first preset speed, the opening degree is fully open; when the speed of the buffer rod (13) is greater than the second preset speed, the opening degree is half open. The first preset speed is greater than the second preset speed. The controller (10) is connected to the limit switch (5) by signal. Under normal conditions, the controller (10) is de-energized and does not work. When a fall accident occurs, the controller (10), the speed sensor (8) and the switch control valve (9) are energized and put into operation by receiving the signal from the limit switch (5).

4. The buffer with a unidirectional buffer tube structure according to claim 1, characterized in that, The unidirectional buffer tube (2) includes multiple tubes, which are connected in parallel between the buffer cylinder (1) and the buffer device (3).

5. The buffer with a unidirectional buffer tube structure according to claim 1, characterized in that, The buffer cylinder (1) also includes: A compression spring (6) is sleeved on the buffer rod (13), and the compression spring (6) is configured to push the buffer rod (13) to perform a tensile reset motion.

6. The buffer with a unidirectional buffer tube structure according to claim 5, characterized in that, Along the vertical direction (X), the buffer cylinder (1) is configured above the buffer device (3), and the buffer with a unidirectional buffer tube structure further includes: A guide tube (7) is disposed in the buffer device (3). One end of the guide tube (7) is connected to the bottom of the buffer cavity (14), and the other end is connected to the buffer outlet (22).

7. The buffer with a unidirectional buffer tube structure according to claim 1, characterized in that, Along the vertical direction (X), the buffer cylinder (1) is configured below the buffer device (3) such that the buffer device (3) flows into the buffer cylinder (1) by gravity; and / or, The buffer device (3) is a sealed reflux cylinder.

8. The buffer with a unidirectional buffer tube structure according to claim 1, characterized in that, The main pipeline includes a first oil pipe segment (101), a second oil pipe segment (102), a third oil pipe segment (103), a fifth oil pipe segment (105), a sixth oil pipe segment (106), a seventh oil pipe segment (107), a ninth oil pipe segment (109), a tenth oil pipe segment (110), an eleventh oil pipe segment (111), a twelfth oil pipe segment (112), a thirteenth oil pipe segment (113), and a fifteenth oil pipe segment (115) connected in sequence, and the valve return pipeline includes a fourth oil pipe segment (104), an eighth oil pipe segment (108), and a fourteenth oil pipe segment (114); Hydraulic oil flowing in from the first oil pipe section (101) is diverted at the second oil pipe section (102) to the third oil pipe section (103) and the fourth oil pipe section (104). After flowing through the fourth oil pipe section (104) in a certain arc to the fifth oil pipe section (105), it counteracts the hydraulic oil flowing out of the third oil pipe section (103). The remaining hydraulic oil after counteracting flows through the sixth oil pipe section (106) and then through the seventh oil pipe section (107) to the eighth oil pipe section (108) and the ninth oil pipe section (109). After flowing through the arc-shaped channel, the hydraulic oil of the eighth oil pipe section (108) merges with the hydraulic oil of the ninth oil pipe section (109) at the tenth oil pipe section (110) and generates a counter-force in opposite directions. After the counter-force, the remaining hydraulic oil flows through the eleventh oil pipe section (111) and then splits at the twelfth oil pipe section (112) to the thirteenth oil pipe section (113) and the fourteenth oil pipe section (114). After flowing through the arc-shaped channel, the hydraulic oil of the fourteenth oil pipe section (114) merges with the hydraulic oil of the thirteenth oil pipe section (113) at the fifteenth oil pipe section (115).

9. An elevator, characterized in that, include: Lifting equipment; A transmission device, connected to the lifting equipment, is used to drive the lifting equipment to perform lifting movements; A safety device comprising a buffer having a unidirectional buffer tube structure as described in any one of claims 1-8, the buffer having the unidirectional buffer tube structure being configured to provide drop cushioning for the lifting device.

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