Bearing type telescopic support with locking and releasing functions

Abstract

The invention provides a bearing type telescopic support with locking and releasing functions. Automatic control over limiting, locking and releasing is achieved through a mechanical structure. The bearing type telescopic support comprises a mounting base, a hydraulic cylinder, a bearing supporting rod, a guide base, a locking device, a releasing device and a base. A cylinder body base of the hydraulic cylinder is fixedly connected to the mounting seat, and a piston rod end is vertically downward; bearing supporting rods are symmetrically and vertically arranged on the two sides of the hydraulic cylinder, and the bottoms of the two bearing supporting rods are connected with the base through releasing devices correspondingly. A guide base is arranged outside each bearing supporting rod, and the guide bases are fixedly connected with a cylinder body base of the hydraulic cylinder; the lower ends of the two bearing supporting rods are fixedly connected through a supporting rod connecting base. An upper flange of the stroke limiting seat is fixedly connected to the piston rod end of the hydraulic cylinder through a control rod connecting seat, and a center shaft penetrates through a center hole of the supporting rod connecting seat. The locking device is arranged on the side face of the guide base and used for axial locking and limiting of the bearing supporting rod on the corresponding side.

Description

Technical Field

[0001] The invention relates to a telescopic bracket, in particular to a load-bearing telescopic bracket with a locking and releasing function, and belongs to the technical field of mechanical automation. Background Art

[0002] In engineering machinery and automation equipment, electric or hydraulic linear actuators are often used as drive solutions to achieve linear reciprocating motion such as telescopic movement. Especially under low-speed, heavy-load, and harsh working conditions, single-stage or multi-stage hydraulic cylinders are generally used as drives, such as common engineering machinery, lifting equipment, etc., and are widely used.

[0003] For working conditions with continuous heavy loads along the direction of hydraulic cylinder movement, such as the design of hydraulic support base, etc. In order to ensure axial load and limit requirements and withstand radial loads, a strengthening structure is designed along the driving direction of the hydraulic cylinder, such as sleeves, slide rails and other similar structures, to withstand axial and radial load impacts and improve the overall strength and rigidity of the structure.

[0004] The hydraulic cylinder bears the axial load, and the axial limit is mainly realized by the self-locking of the hydraulic circuit. To further improve the reliability and prevent the failure of the self-locking after the hydraulic system fails, a mechanical limit structure is added to the external structure of the limit position, and a latch locking method can be adopted. At the same time, in order to avoid getting stuck due to the change of load during the execution process, a release device is designed at the end of the execution end.

[0005] To realize the automatic control function of the above self-locking and limit actions, the conventional solution is to add corresponding electric or hydraulic actuators. At the same time, in order to ensure the reliability of the system, it is necessary to detect whether these actions are executed in place, and it is also necessary to add corresponding position detection sensors.

[0006] Taking the electric actuator solution as an example, an electric latch locking device is required at the initial position of the hydraulic cylinder and the end position of the hydraulic cylinder's stroke. The device should also have a position feedback function to determine whether it is locked in place; an electric release device is required at the hydraulic cylinder's actuator connection point. The entire electrical control system requires three power supplies, two position detections, and a controller to control the three devices. The system composition is relatively complex and the implementation cost is high. This solution is particularly uneconomical, especially in scenarios where the project budget is small and the system resources are particularly limited. If the hydraulic actuator solution is adopted, it is necessary to add three additional hydraulic cylinders, corresponding pipelines, control valve groups, hydraulic source interfaces, etc. The system composition is more complex and the implementation cost is higher. Summary of the invention

[0007] In view of this, the present invention provides a load-bearing telescopic bracket with locking and releasing functions, which uses a mechanical structure to realize automatic control of limiting, locking and releasing, and has the characteristics of small control system resource requirements, reliable operation and low implementation cost.

[0008] The technical solution of the present invention is: a load-bearing telescopic bracket with locking and releasing functions, comprising: a mounting seat, a hydraulic cylinder, a load-bearing support rod, a guide base, a locking device, a releasing device and a base;

[0009] The cylinder base of the hydraulic cylinder is fixedly connected to the mounting seat, and the piston rod end is vertically downward;

[0010] The two sides of the hydraulic cylinder are symmetrically and vertically provided with load-bearing support rods, and the bottoms of the two load-bearing support rods are respectively connected to the base through release devices, and the release devices can realize the release between the load-bearing support rods and the base;

[0011] Each load-bearing support rod is provided with a guide base outside for guiding the movement of the load-bearing support rod; the guide base is fixedly connected to the cylinder base of the hydraulic cylinder;

[0012] The lower ends of the two load-bearing support rods are fixedly connected through a support rod connecting seat; the travel limit seat has a central axis and upper and lower flanges; the upper flange of the travel limit seat is fixedly connected to the piston rod end of the hydraulic cylinder through a control rod connecting seat, and the central axis passes through the central hole of the support rod connecting seat;

[0013] The locking device is arranged on the side of the guide base, and is used for axial locking and limiting when the corresponding side bearing support rod is in an extended or retracted state.

[0014] As a preferred embodiment of the present invention: the two sides of the control rod connecting seat are respectively fixedly connected to the ejector control rod; the locking device cooperates with the ejector control rod on the corresponding side to achieve axial locking and limiting of the load-bearing support rod;

[0015] The load-bearing support rod is provided with an upper locking hole and a lower locking hole;

[0016] The locking device comprises: a lock pin fixing cylinder, a buffer pin, a buffer pin fixing seat, a locking spring A, a preload spring B and a lock pin;

[0017] The locking device is vertically mounted on the side of the guide base through a buffer pin fixing seat; the guide base is a hollow cylindrical structure with one end open and the other end provided with a through hole, and the open end is fixedly connected to the side of the guide base; the buffer pin is arranged in the buffer pin fixing seat and cooperates with the axial hole of the punching pin fixing seat; the buffer pin has a sliding portion that slides with the buffer pin fixing seat and a cylindrical protrusion arranged on the end surface of the sliding portion, and the cylindrical protrusion of the buffer pin can extend from the through hole of the buffer pin fixing seat to contact the surface of the ejector control rod on the corresponding side; a preload spring B is arranged between the end surface of the sliding portion of the buffer pin and the side of the guide base;

[0018] The end surface of the buffer pin sliding part has a blind hole with an internal thread, which is used to be coaxially connected with a lock pin fixing cylinder with openings at both ends through a thread; a through hole is provided at a position corresponding to the lock pin fixing cylinder on the side surface of the guide base, and the other end of the lock pin fixing cylinder is located in the through hole; one end of the lock pin is located inside the lock pin fixing cylinder, and is slidably matched with the lock pin fixing cylinder, and can move axially along the lock pin fixing cylinder; the other end can be extended into the upper locking hole or the lower locking hole of the corresponding side bearing support rod; a locking spring A is provided between the end surface of the lock pin located inside the lock pin fixing cylinder and the inner bottom surface of the blind hole of the end surface of the buffer pin sliding part;

[0019] The ejector control rod includes a small diameter section in the middle and large diameter sections at both ends. The large diameter section at the upper end cooperates with the upper locking hole to achieve locking in the expanded state, and the large diameter section at the lower end cooperates with the lower locking hole to achieve locking in the retracted state.

[0020] As a preferred embodiment of the present invention: a vertically arranged guide cylinder is installed on each side of the hydraulic cylinder on the mounting seat, the ejector control rod is slidably matched with the guide cylinder, and the guide cylinder is used for guiding the ejector control rod.

[0021] As a preferred embodiment of the present invention: the release device comprises: a locking lug, a locking spring C, a pin, a steel ball and a connecting shaft seat;

[0022] The top of the locking ear is hingedly connected to the bottom end surface of the bearing support rod, and the connecting shaft seat is located below the locking ear, and its shaft end extends into the central hole of the locking ear and cooperates with the shaft hole between the locking ears;

[0023] The locking ear is provided with four radial through holes distributed along the circumferential direction; a locking spring C, a steel ball and a pin are installed in each radial through hole, and the locking spring C is located in the radial through hole, one end of which is in contact with the steel ball at the bottom of the hole, and the other end is limited by the pin, and the pin is used to adjust the preload force of the locking spring C;

[0024] The bottom of the connecting shaft seat is fixedly connected to the base, and an arc-shaped groove is designed on the connecting shaft seat at a position corresponding to the steel ball. The steel ball can be inserted into the connecting shaft seat under the force of the locking spring C to achieve the connection between the base and the lower end of the load-bearing support rod.

[0025] As a preferred embodiment of the present invention: the load-bearing support rod is a square tube structure, the guide base is coaxially sleeved on the outside of the lower end of the load-bearing support rod, and the contact surfaces around the guide base and the load-bearing support rod are provided with roller structures.

[0026] Beneficial effects:

[0027] (1) The load-bearing telescopic bracket of the present invention fully adopts a mechanical structure design while meeting the functional requirements. That is, the locking, unlocking, and releasing actions and the timing of each action do not require the participation of an additional electrical control system, but are completely realized by the mechanical linkage generated by the movement of the hydraulic cylinder; replacing the original solution that requires an electric actuator, greatly simplifies the design of the entire control system and electrical system, and reduces the demand for system resources; compared with the electrical control solution, due to the simplification of the composition, the electrical actuator and control system are omitted, the external interface is simplified, and the production and manufacturing cost of the entire system is reduced, with obvious cost advantages; a purely mechanical structure design solution is adopted to meet the functional requirements. Under the same functional performance, the system has higher reliability and lower use and maintenance costs.

[0028] (2) In the load-bearing telescopic bracket of the present invention, the locking device utilizes structural design to convert axial linear motion into 90-degree insertion and extraction pin motion, and controls the timing of locking and unlocking actions through the stroke difference of the axial parallel mechanism.

[0029] (3) In the load-bearing telescopic bracket of the present invention, the release device adopts an assembly connection method of a spring, a steel ball and a pin, and the magnitude of the release force is adjustable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the telescopic bracket of the present invention in a retracted state;

[0031] Figure 2 A side view of the telescopic bracket of the present invention in a retracted state;

[0032] Figure 3 It is a schematic diagram of the positions of the support rod connecting seat and the travel limit seat when the telescopic bracket of the present invention is in the retracted state;

[0033] Figure 4 It is a schematic diagram of the positions of the support rod connecting seat and the travel limit seat when the telescopic bracket of the present invention is in the unfolded state;

[0034] Figure 5 for Figure 1 The enlarged view at A in the middle is a schematic diagram of the structure of the locking device;

[0035] Figure 6 It is a structural schematic diagram of the telescopic bracket of the present invention when it is in an unfolded state;

[0036] Figure 7 A side view of the telescopic bracket of the present invention in an unfolded state;

[0037] Figure 8 It is a schematic diagram of the structure of the release device;

[0038] Fig. 9 A top view of the release device.

[0039] Among them: 1-mounting seat, 2-hydraulic cylinder, 3-bearing support rod, 4-guide cylinder, 5-guide base, 6-locking device, 7-top pin control rod, 8-release device, 9-base, 10-support rod connecting seat, 11-travel limit seat, 12-control rod connecting seat, 13-fixed seat, 14-locking pin fixing cylinder, 15-buffer pin, 16-buffer pin fixing seat, 17-locking spring A, 18-preload spring B, 19-locking pin, 20-locking lifting ear, 21-locking spring C, 22-pin, 23-steel ball, 24-connecting shaft seat. DETAILED DESCRIPTION

[0040] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0041] Embodiment 1;

[0042] The present embodiment provides a load-bearing telescopic bracket with locking and releasing functions. The telescopic bracket has the functions of automatic axial locking and limiting, unlocking, automatic base release, etc., and also has the characteristics of large axial load-bearing capacity and strong driving ability.

[0043] like Figure 1 and Figure 2 As shown, the load-bearing telescopic bracket includes: a mounting seat 1, a hydraulic cylinder 2, a load-bearing support rod 3, a guide cylinder 4, a guide base 5, a locking device 6, a top pin control rod 7, a release device 8, a base 9, a support rod connecting seat 10, a travel limit seat 11, a control rod connecting seat 12 and a fixed seat 13.

[0044] The mounting seat 1 is the external mounting interface of the entire device. The cylinder body base of the hydraulic cylinder 2 is fixedly mounted in the middle of the lower end surface of the mounting seat 1, so that the piston rod end of the hydraulic cylinder 2 is vertically downward. On the mounting seat 1, a vertically arranged guide cylinder 4 is installed on both sides of the hydraulic cylinder 2. The vertically arranged bearing support rods 3 are symmetrically arranged outside the two guide cylinders 4; the bearing support rods 3 mainly play the role of bearing reinforcement; the bottoms of the two bearing support rods 3 are respectively connected to the base 9 through the release device 8. The release device 8 can realize the release between the bearing support rod 3 and the base 9.

[0045] An upper locking hole and a lower locking hole are designed on the load-bearing support rod 3, which are respectively used for axial locking and limiting of the load-bearing support rod 3 after it is fully deployed and in the axial locking and limiting state in the retracted state.

[0046] A guide base 5 is provided at the lower end of each load-bearing support rod 3, and its function is to provide guidance for the linear motion of the load-bearing support rod 3, and at the same time cooperate with the locking device 6 to constrain the side of the load-bearing support rod 3 to achieve locking and limiting of the motion direction. As an example, the load-bearing support rod 3 is a square tube structure, and the guide base 5 is coaxially sleeved on the outside of the lower end of the load-bearing support rod 3. The guide base 5 and the surrounding contact surfaces of the load-bearing support rod 3 are provided with roller structures, which can reduce the friction of the motion, so that the load-bearing support rod 3 can only move flexibly along the telescopic direction of the hydraulic cylinder 2. The two guide bases 5 are installed in a mirror image along the hydraulic cylinder 4, and the cylinder base of the hydraulic cylinder 2, the guide cylinder 4, etc. are fixedly connected together through the fixing seat 13 in the middle.

[0047] The lower ends of the two bearing support rods 3 are fixedly connected together through the support rod connecting seat 10. The middle of the support rod connecting seat 10 has a center hole at a position corresponding to the piston rod end of the hydraulic cylinder 2. The travel limit seat 11 is a structure with a center axis and upper and lower flanges; the upper flange of the travel limit seat 11 is fixedly connected to the piston rod end of the hydraulic cylinder 2 through the control rod connecting seat 12; the center axis of the travel limit seat 11 passes through the center hole of the support rod connecting seat 10 and is connected to the travel limit seat 11 through the shaft hole; the center axis of the travel limit seat 11 can slide up and down in the center hole of the support rod connecting seat 10.

[0048] The two sides of the control rod connecting seat 12 are respectively fixedly connected to the ejector control rod 7, and the upper part of the ejector control rod 7 is coaxially sleeved in the corresponding guide cylinder 4 and slidably cooperates with the guide cylinder 4. The guide cylinder 4 is used to guide the ejector control rod 7; when the piston rod of the hydraulic cylinder 3 moves, it can drive the two ejector control rods 7 to move synchronously along the guide cylinder 4; at the same time, the piston rod of the hydraulic cylinder 3 can drive the two bearing support rods 3 to move through the stroke limit seat 11.

[0049] like Figure 5 As shown, the two ejector control rods 7 are in contact with locking devices 6 respectively installed on the sides of the two guide bases 5; that is, each ejector control rod 7 is matched with a locking device 6, and the locking device 6 is used for axial locking and limiting of the corresponding side load-bearing support rod 3.

[0050] The locking device 6 includes: a locking pin fixing cylinder 14, a buffer pin 15, a buffer pin fixing seat 16, a locking spring A17, a preload spring B18 and a locking pin 19; the locking device 6 is vertically mounted on the side of the guide base 5 through the buffer pin fixing seat 16, that is, the buffer pin fixing seat 16 is mounted on the guide base 5 along the normal direction of the side of the guide base 5; the guide base 5 is a hollow cylindrical structure with one end open and the other end provided with a through hole, and its open end is fixedly connected to the side of the guide base 5. The buffer pin 15 is arranged in the buffer pin fixing seat 16 and cooperates with the axial hole of the punching pin fixing seat 16; the buffer pin 15 has a sliding portion that slidably cooperates with the buffer pin fixing seat 16 and a cylindrical protrusion arranged on the end surface of the sliding portion, and the cylindrical protrusion of the buffer pin 15 can extend from the through hole of the buffer pin fixing seat 16 to contact the surface of the ejector control rod 7 on the corresponding side. A preload spring B18 is provided between the end surface of the sliding portion of the buffer pin 15 and the side surface of the guide base 5 to ensure that the cylindrical protrusion of the buffer pin 15 is always in contact with the surface of the ejector control rod 7 under the action of the spring preload force.

[0051] The end face of the sliding part of the buffer pin 15 has a blind hole with an internal thread, which is used to be coaxially connected with the locking pin fixing cylinder 14 with openings at both ends through threads; a through hole is provided at a position corresponding to the locking pin fixing cylinder 14 on the side of the guide base 5, and the other end of the locking pin fixing cylinder 14 is located in the through hole; one end of the locking pin 19 is located inside the locking pin fixing cylinder 14, slidingly cooperates with the locking pin fixing cylinder 14, and can move axially along the locking pin fixing cylinder 14; the other end can be extended into the locking hole of the corresponding side bearing support rod 3; a locking spring A17 is provided between the end face of the locking pin 19 located inside the locking pin fixing cylinder 14 and the bottom surface of the blind hole on the end face of the sliding part of the buffer pin 15; the locking pin 19 can be inserted into the locking hole (upper locking hole or lower locking hole) of the bearing support rod 3 under the action of the locking spring A17 to realize the axial locking and limiting function of the bearing support rod 3.

[0052] The ejector pin control rod 7 adopts a variable diameter design, which can move axially with the piston rod of the hydraulic cylinder 2 to change the matching state of the buffer pin 15 therewith, thereby realizing the state switching between locking and unlocking. Specifically: the ejector pin control rod 7 includes a small diameter section in the middle and large diameter sections at both ends, and the large diameter section and the small diameter section are transitioned by a truncated cone section. The large diameter section at the upper end cooperates with the upper locking hole to realize locking in the unfolded state, and the large diameter section at the lower end cooperates with the lower locking hole to realize locking in the retracted state. When the large diameter section of the ejector pin control rod 7 conflicts with the buffer pin 15, and the locking hole of the bearing support rod 3 corresponds to the position of the locking pin 19, the buffer pin 15 moves in the buffer pin fixing seat 16, and the locking pin 19 is clamped into the locking hole of the bearing support rod 3 under the force of the locking spring A17 to realize the axial locking and limiting function of the bearing support rod 3. When the small diameter section of the ejector pin control rod 7 conflicts with the buffer pin 15, the locking pin 19 withdraws from the locking hole of the bearing support rod 3.

[0053] The working principle of the telescopic bracket is as follows:

[0054] (I) Development process

[0055] like Figure 1 As shown, initially, the entire bracket is in a retracted state, at which time the buffer pin 15 presses against the large diameter surface at the lower end of the ejector control rod 7 to compress the preload spring 18, thereby squeezing the internal locking spring 17, and the locking pin 19 enters the lower locking hole of the bearing support rod 3 under the action of the spring, and the support rod 3 is axially limited and in an axially limited locking state. At this time, the support rod connecting seat 10 contacts the lower flange surface of the travel limit seat 11, as shown in FIG. Figure 3 shown.

[0056] When the piston rod of the hydraulic cylinder 2 starts to move, that is, when the piston rod of the hydraulic cylinder 2 is extended downward, since the support rod connecting seat 10 contacts the lower flange surface of the travel limit seat 11, there is a gap between the upper and lower flange surfaces of the travel limit seat 11, so the piston rod of the hydraulic cylinder 2 will first drive the control rod connecting seat 12 and the support rod connecting seat 10 to drive the top pin control rod 7 to move downward. In this process, the contact part between the top pin control rod 7 and the buffer pin 15 will gradually change from a large diameter state to a small diameter state (that is, the large diameter section gradually changes to a small diameter section). Since the buffer pin 15 is always subjected to the force of the preload spring 18, the whole will move axially along the buffer pin fixing seat 16, causing the lock pin 19 to come out of the lower locking hole of the support rod 3 and thus release the lock. In this process, the support rod connecting seat 10 does not contact the upper flange of the travel limit seat 11 and is always in a static state. Therefore, before the unlocking action is completed, the load-bearing support rod 3 is always in a static state, so the unlocking process will not be stuck due to relative movement.

[0057] Then the piston rod of the hydraulic cylinder 2 continues to move, and when the support rod connecting seat 10 contacts the upper flange of the travel limit seat 11 (such as Figure 4 As shown), the support rod connecting seat 10 drives the top pin control rod 7 and the load-bearing support rod 3 and the release device 8 at the bottom, and the releasable base 9 to move. At this time, the locking device 6 is in an unlocked state, and the load-bearing support rod 3 will move along the guide base 5 (i.e., unfold downward).

[0058] Before the piston rod of the hydraulic cylinder 2 reaches the final position, the ejector control rod 7 gradually changes its diameter to a large diameter state, causing the buffer pin 15 to compress the preload spring 18, and then squeeze the internal locking spring 17, applying a preload force to the lock pin 19. At this time, the load-bearing support rod 3 has not yet reached the limit position (i.e., the position of the upper locking hole), and the lock pin 19 will push against the outer surface of the load-bearing support rod 3 under the action of the spring preload force, and perform a sliding friction movement until the piston rod of the hydraulic cylinder 2 drives the load-bearing support rod 3 to the final position. At this time, the upper locking hole of the load-bearing support rod 3 is in place, and the lock pin 19 is stuck in the upper locking hole under the action of the spring force. The load-bearing support rod 3 is in a locked state and cannot continue to move axially. Figure 7 and Figure 8 shown.

[0059] (II) Retraction process

[0060] The working principle of the retraction process is similar to that of the deployment process. When the piston rod of the hydraulic cylinder 2 drives the ejector control rod 7 to move upward first, the ejector control rod 7 enters the small diameter section to cause the locking device 6 to unlock. After that, the support rod connecting seat 10 contacts the lower flange of the travel limit seat 11, and the load-bearing support rod 3 starts to move from a static state. Before reaching the retraction end position, the ejector control rod 7 gradually changes from a small diameter to a large diameter state, and a pre-tightening force is applied to the lock pin 19 in advance, until the lock pin 19 is in place and is stuck in the lower locking hole of the load-bearing support rod 3, realizing the locking limit of the retracted state.

[0061] Embodiment 2:

[0062] Based on the above-mentioned embodiment 1, this embodiment provides a preferred structural form of the release device (8).

[0063] The bottoms of the two bearing support rods 3 are connected to the base 9 via release devices 8 , respectively. The release devices 8 are used for release between the base 9 and the bearing support rods 3 .

[0064] The release device 8 includes: a locking ear 20, a locking spring C21, a pin 22, a steel ball 23 and a connecting shaft seat 24; wherein the top of the locking ear 20 is hingedly connected to the bottom end surface of the bearing support rod 3, and the connecting shaft seat 24 is located below the locking ear 20, and its axial end extends into the center hole of the locking ear 20 and cooperates with the axial hole between the locking ear 20; there are four radial through holes distributed circumferentially on the locking ear 20 (that is, the radial through hole is connected to the center hole of the locking ear 20), and the four radial holes are distributed in an X shape; a locking spring C21, a steel ball 23 and a pin 22 are assembled in each radial through hole, and the locking spring C21 is located in the radial through hole, one end of which is in contact with the steel ball 23 at the bottom of the hole, and the other end is limited by the pin 22.

[0065] The bottom of the connecting shaft seat 24 is fixedly connected to the base 9, and the top is matched with the shaft hole between the locking ear 20; the position corresponding to the steel ball 23 on the connecting shaft seat 24 is designed with an arc groove, and the steel ball 23 can be inserted into the connecting shaft seat 24 under the force of the locking spring C21 to achieve the connection between the base 9 and the lower end of the load-bearing support rod 3. The main function of the pin 22 is to indirectly adjust the pre-tightening force of the locking spring C21 by adjusting the screwing stroke, thereby adjusting the release force of the connection between the base 9 and the load-bearing support rod 3.

[0066] Base release process:

[0067] After the entire bracket is deployed, the base 9 is in contact with the ground and subjected to force. During the process of retracting from the deployed state, the base 9 bears the supporting force of the system and may sink due to excessive load (such as when the bracket is used as a fulcrum for an unmanned vehicle to contact the seabed). The locking force between the release base 9 and the load-bearing support rod 3 connected by the release device 8 is provided by the axial friction force generated by the groove of the connecting shaft seat 24 where the locking spring 21 squeezes the steel ball 23. When the sinking adsorption force on the base 9 is greater than the axial locking force, the steel ball 23 will be squeezed out of the groove to overcome the spring force preload, thereby separating the release base 9 from the load-bearing support rod 3, thereby realizing the release function of the base.

[0068] The locking, unlocking, releasing actions and the timing of each action during the entire unfolding, retracting and releasing process of the bracket do not require the participation of an additional electrical control system, but are completely realized by the mechanical linkage generated by the movement of the hydraulic cylinder 2. The entire device system is simple, reliable in control, and low in implementation cost.

[0069] Although the present invention has been described in detail above by general description and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all belong to the scope of protection claimed by the present invention.

Claims

1. A load-bearing telescopic bracket with locking and releasing function, characterized in that: include: A mounting seat (1), a hydraulic cylinder (2), a bearing support rod (3), a guide base (5), a locking device (6), a release device (8) and a base (9); The cylinder base of the hydraulic cylinder (2) is fixedly connected to the mounting seat (1), and the piston rod end is vertically downward; The two sides of the hydraulic cylinder (2) are symmetrically and vertically provided with load-bearing support rods (3), the bottoms of the two load-bearing support rods (3) are respectively connected to the base (9) via release devices (8), and the release devices (8) can realize the release between the load-bearing support rods (3) and the base (9); Each load-bearing support rod (3) is provided with a guide base (5) outside thereof, which is used for guiding the movement of the load-bearing support rod (3); the guide base (5) is fixedly connected to the cylinder body base of the hydraulic cylinder (2); The lower ends of the two load-bearing support rods (3) are fixedly connected via a support rod connecting seat (10); the travel limit seat (11) has a central axis and upper and lower flanges; the upper flange of the travel limit seat (11) is fixedly connected to the piston rod end of the hydraulic cylinder (2) via a control rod connecting seat (12), and the central axis passes through the central hole of the support rod connecting seat (10); The locking device (6) is arranged on the side of the guide base (5) and is used for axial locking and limiting of the corresponding side bearing support rod (3) in the expanded or retracted state.

2. The load-bearing telescopic bracket with locking and releasing function as claimed in claim 1, characterized in that: The two sides of the control rod connecting seat (12) are respectively fixedly connected to the ejector pin control rod (7); the locking device (6) cooperates with the ejector pin control rod (7) on the corresponding side to achieve axial locking and limiting of the load-bearing support rod (3); The load-bearing support rod (3) is provided with an upper locking hole and a lower locking hole; The locking device (6) comprises: a locking pin fixing cylinder (14), a buffer pin (15), a buffer pin fixing seat (16), a locking spring A (17), a preload spring B (18) and a locking pin (19); The locking device (6) is vertically mounted on the side of the guide base (5) through a buffer pin fixing seat (16); the guide base (5) is a hollow cylindrical structure with one end open and the other end provided with a through hole, and the open end is fixedly connected to the side of the guide base (5); the buffer pin (15) is arranged in the buffer pin fixing seat (16) and cooperates with the axial hole of the punching pin fixing seat (16); the buffer pin (15) has a sliding portion that slidably cooperates with the buffer pin fixing seat (16) and a cylindrical protrusion arranged on the end face of the sliding portion, and the cylindrical protrusion of the buffer pin (15) can extend from the through hole of the buffer pin fixing seat (16) and contact the surface of the ejector control rod (7) on the corresponding side; a preload spring B (18) is arranged between the end face of the sliding portion of the buffer pin (15) and the side of the guide base (5); The end surface of the sliding part of the buffer pin (15) has a blind hole with an internal thread, which is used to be coaxially connected to the lock pin fixing cylinder (14) with two ends opened through the thread; a through hole is provided on the side surface of the guide base (5) at a position corresponding to the lock pin fixing cylinder (14), and the other end of the lock pin fixing cylinder (14) is located in the through hole; one end of the lock pin (19) is located inside the lock pin fixing cylinder (14), and is slidably matched with the lock pin fixing cylinder (14) and can move axially along the lock pin fixing cylinder (14); the other end can extend into the upper locking hole or the lower locking hole of the corresponding side bearing support rod (3); a locking spring A (17) is provided between the end surface of the lock pin (19) located inside the lock pin fixing cylinder (14) and the inner bottom surface of the blind hole of the end surface of the sliding part of the buffer pin (15); The ejector control rod (7) comprises a small diameter section in the middle and large diameter sections at both ends, wherein the large diameter section at the upper end cooperates with the upper locking hole to achieve locking in the deployed state, and the large diameter section at the lower end cooperates with the lower locking hole to achieve locking in the retracted state.

3. The load-bearing telescopic bracket with locking and releasing function as claimed in claim 2, characterized in that: On the mounting seat (1), a vertically arranged guide cylinder (4) is respectively installed on both sides of the hydraulic cylinder (2), the ejector control rod (7) is slidably matched with the guide cylinder (4), and the guide cylinder (4) is used to guide the ejector control rod (7).

4. The load-bearing telescopic bracket with locking and releasing function as claimed in claim 1, characterized in that: The release device (8) comprises: a locking lug (20), a locking spring C (21), a pin (22), a steel ball (23) and a connecting shaft seat (24); The top of the locking ear (20) is hingedly connected to the bottom end surface of the bearing support rod (3), and the connecting shaft seat (24) is located below the locking ear (20), and its shaft end extends into the central hole of the locking ear (20) and cooperates with the shaft hole between the locking ear (20); The locking ear (20) is provided with four radial through holes distributed along the circumferential direction; a locking spring C (21), a steel ball (23) and a pin (22) are installed in each radial through hole; the locking spring C (21) is located in the radial through hole, one end of the locking spring C (21) is in contact with the steel ball (23) at the bottom of the hole, and the other end is limited by the pin (22); the pin (22) is used to adjust the preload force of the locking spring C (21); The bottom of the connecting shaft seat (24) is fixedly connected to the base (9); an arc-shaped groove is designed on the connecting shaft seat (24) at a position corresponding to the steel ball (23); the steel ball (23) can be inserted into the connecting shaft seat (24) under the action of the locking spring C (21), thereby realizing the connection between the base (9) and the lower end of the bearing support rod (3).

5. The load-bearing telescopic bracket with locking and releasing function according to any one of claims 1 to 4, characterized in that: The load-bearing support rod (3) is a square tube structure, the guide base (5) is coaxially sleeved on the outside of the lower end of the load-bearing support rod (3), and the contact surfaces around the guide base (5) and the load-bearing support rod (3) are provided with roller structures.

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