阅读说明：本技术 一种用于齿轨卡轨车的超速制动车 (Overspeed braking vehicle for rack rail clamping vehicle ) 是由 尚绪海 于 2020-12-23 设计创作，主要内容包括：本发明属于矿山机械技术领域,具体涉及一种用于齿轨卡轨车的超速制动车。包括：底架,底架的两端均设有承载轮组和驱动组件；承载轮组置于卡轨上；驱动组件与齿轨适配；顶架,顶架设于底架的上方,且两端均设有制动组件,制动组件位于卡轨的外侧,适于在顶架下移时压紧卡轨；弹性组件,设于底架和顶架之间；超速保护器,包括限速组件和执行部件；执行部件的一端与顶架连接,另一端与底架连接,适于驱动所述顶架上下移动；限速组件设于底架上,并与执行部件连接,适于在底架超速时驱动执行部件。上述结构的制动结构紧凑,整个超速制动车的重心较低,从而避免了制动车因输送重物时头重脚轻而导致的侧翻现象,继而使齿轨卡轨车行驶稳固。(The invention belongs to the technical field of mining machinery, and particularly relates to an overspeed brake vehicle for a rack rail clamping vehicle. The method comprises the following steps: the device comprises a chassis, a driving component and a driving component, wherein both ends of the chassis are provided with bearing wheel sets and the driving component; the bearing wheel set is arranged on the clamping rail; the driving component is matched with the rack; the top frame is arranged above the bottom frame, and two ends of the top frame are provided with brake components which are positioned on the outer side of the clamping rail and are suitable for pressing the clamping rail when the top frame moves downwards; the elastic component is arranged between the bottom frame and the top frame; the overspeed protector comprises a speed limiting assembly and an execution component; one end of the execution component is connected with the top frame, and the other end of the execution component is connected with the bottom frame and is suitable for driving the top frame to move up and down; the speed limiting assembly is arranged on the underframe, is connected with the executing component and is suitable for driving the executing component when the underframe exceeds the speed. The braking structure of the structure is compact, and the center of gravity of the whole overspeed braking vehicle is lower, so that the side turning phenomenon caused by the fact that the head is heavy and the feet are light when the braking vehicle conveys heavy objects is avoided, and the rack rail clamping vehicle can stably run.)

1. An over-speed brake car for a rack-and-pinion railcar, comprising:

the braking assemblies are arranged at the two ends of the bottom frame and positioned at the outer sides of the clamping rails and are suitable for pressing the clamping rails when the bottom frame moves upwards;

the top frame is arranged above the bottom frame, and both ends of the top frame are provided with a bearing wheel set and a driving assembly; the bearing wheel set is arranged on the clamping rail; the driving assembly is matched with the clamping rail and is suitable for driving the top frame to move on the clamping rail;

the elastic component comprises a piston cylinder and an elastic body; the piston cylinder is positioned below the bottom frame, and a piston penetrates through the bottom frame to be connected with the top frame; one end of the elastic body is connected with the bottom frame, the other end of the elastic body is connected with a base of the piston cylinder, and when the piston extends, the elastic body is in a compressed state;

the overspeed protector comprises a speed limiting assembly and an execution component; one end of the execution component is connected with the top frame, and the other end of the execution component is connected with the bottom frame and is suitable for driving the top frame to move up and down; the speed limiting assembly is arranged on the underframe, is connected with the executing component and is suitable for driving the executing component when the underframe exceeds the speed.

2. The overspeed brake vehicle for a rack and pinion railcar according to claim 1, wherein said overspeed protector further comprises a hydraulic control assembly, said hydraulic control assembly comprising an oil tank assembly, a control oil circuit, an implement oil circuit, and a quick release valve; the control oil circuit is arranged between the oil tank assembly and the speed limiting assembly, and the execution oil circuit is arranged between the oil tank assembly and the execution component; the quick release valve is respectively communicated with the control oil way and the execution oil way and used for adjusting the oil pressure of the execution oil way according to the oil pressure of the control oil way.

3. The overspeed braking car for rack rail trucks of claim 2,

an overflow valve, a first control valve and a second control valve are arranged on the control oil path, and the overflow valve is used for controlling the pressure of the control oil path; the first control valve is connected with the speed limiting assembly, one end of the second control valve is connected with the quick release valve, and the other end of the second control valve is linked with the first control valve.

4. An overspeed braking car for rack rail trucks according to claim 3,

the driving assembly comprises a motor and a driving wheel, the motor is arranged on the top frame, and an output shaft is connected with the driving wheel;

the speed limiting assembly comprises a centrifugal releaser and a throwing wheel valve group; the throwing wheel valve group comprises a valve body and a valve block; the valve block is provided with the valve body and the first control valve, the valve body can slide relative to the valve block to be far away from or close to the valve block, and when the valve body is close to the valve block, a valve core of the first control valve is driven to control the first control valve; the centrifugal releaser is arranged on the output shaft, the outer periphery of the centrifugal releaser is positioned on the outer side of the valve body, and the centrifugal releaser is suitable for driving the valve body.

5. The overspeed braking car for rack rail trucks of claim 4,

the number of the first control valves is two, and the two control valves are connected to the control oil circuit in parallel.

6. Overspeed braking vehicle for rack-rail trucks according to claim 5,

a groove, a protrusion and an inclined plane are arranged on the working surface of the valve body, and the inclined plane is positioned between the groove and the protrusion; the groove corresponds to one first control valve, and the bulge corresponds to the other first control valve;

and a manual actuator is further arranged on the side wall of the valve body and is suitable for pulling the valve body, so that the inclined surface drives the valve core of the first control valve to control the first control valve.

7. An overspeed braking car for rack rail trucks according to claim 3,

the overspeed protector is also provided with a minimum pressure valve, one end of the minimum pressure valve is communicated with the control oil way, and the other end of the minimum pressure valve is communicated with the execution oil way;

and the execution oil path is also provided with a first stop valve and a second stop valve which are connected in series.

8. The overspeed braking car for rack rail trucks of claim 7,

the brake assembly comprises a brake arm, a brake shoe and an installation clamp; the brake arm is including being swing arm and the brake arm of L type connection, the tip of swing arm install in on the chassis, the upper surface of brake arm passes through the installation card is installed the brake hoof, the brake hoof upper surface with the adaptation of card rail.

9. The overspeed brake vehicle for a rack rail truck according to claim 8, wherein said top frame is further provided with a guide assembly, said guide assembly comprises a connecting frame and a guide wheel, the upper end of said connecting frame is mounted on said top frame, the lower end of said connecting frame is mounted with said guide wheel, said guide wheel is located outside said truck rail, and a gap is provided between the rim of said guide wheel and said truck rail.

10. The overspeed brake vehicle for a rack and pinion railcar according to claim 9, wherein said top frame is two in number, one under frame being provided at the bottom of each of said top frames; two bearing wheel sets and one driving assembly are arranged on each top frame, and each of the two driving assemblies corresponds to one clamping rail; and four brake assemblies are arranged on each underframe and are respectively arranged at two ends of the underframe.

Technical Field

The invention belongs to the technical field of mining machinery, and particularly relates to an overspeed brake vehicle for a rack rail clamping vehicle.

Background

In the aspect of domestic coal mine auxiliary transportation, rail transportation is more and more emphasized, wherein a rail clamping rail system developed on the basis of a ground rail is also widely used in China. The rack rail locomotive is characterized in that a rack parallel to two common rails is additionally arranged between the two common rails to serve as a rack rail by utilizing the principle of gear and rack transmission, and 1-2 sets of driving gears (and braking devices) are additionally arranged to be meshed with the rack rail to increase traction force and braking force besides traction force formed by the adhesive force of wheels and the rails during the operation of the locomotive. Thus, the locomotive still uses the common rail on the flat road, and pulls the train to run by the adhesive force; on the ramp, the driving force formed by the gear rack and the adhesive force are used for traction at a lower speed (actually, the former is taken as the main part), so that the traction device has the characteristics of compact structure, high transmission efficiency, safety, reliability, good maneuverability, large traction force, long transportation distance, strong adaptability to roadways and the like.

However, the driving of the prior rack rail clamping vehicle is realized by driving a gear meshed with a rack rail through a hydraulic motor, and the braking is realized through a brake caliper and a brake disc which are arranged on the outer side of the gear, such as Chinese patent CN 109532923A. The driving device and the braking device of this structure have the following disadvantages: 1) when the running speed of the rack rail clamping vehicle is fixed, the power of the hydraulic motor is in inverse proportion to the diameter of the gear, so that the diameter of the driving gear in the driving device is larger, the diameter of the gear is larger, the gravity center of the rack rail braking vehicle is improved, and the condition that the head and feet are light is easy to occur during loading, and further safety accidents such as rollover and the like occur; 2) braking is realized through drive braking pincers and brake disc and walking gear meshing, in case when the structure of brake disc, braking pincers or drive braking pincers or brake disc goes wrong, whole rack rail card rail car will unable realization braking, and then can lead to rack rail card rail car incident such as derailment appearing.

Therefore, in view of the above disadvantages, the present invention is urgently needed to provide an overspeed braking vehicle for a rack rail clamping vehicle.

Disclosure of Invention

The invention aims to provide an overspeed braking vehicle for a rack rail clamping vehicle, which aims to solve the problem of potential safety hazards of the rack rail clamping vehicle caused by the defects of a driving structure and a braking structure in the prior art.

The invention provides an overspeed brake vehicle for a rack rail clamping vehicle, which comprises: the braking assemblies are arranged at the two ends of the bottom frame and positioned at the outer sides of the clamping rails and are suitable for pressing the clamping rails when the bottom frame moves upwards; the top frame is arranged above the bottom frame, and both ends of the top frame are provided with a bearing wheel set and a driving assembly; the bearing wheel set is arranged on the clamping rail; the driving assembly is matched with the clamping rail and is suitable for driving the top frame to move on the clamping rail; the elastic component comprises a piston cylinder and a spring; the piston cylinder is positioned below the bottom frame, and a piston penetrates through the bottom frame to be connected with the top frame; one end of the spring is connected with the bottom frame, the other end of the spring is connected with a base of the piston cylinder, and when the piston extends, the spring is in a compressed state; the overspeed protector comprises a speed limiting assembly and an execution component; one end of the execution component is connected with the top frame, and the other end of the execution component is connected with the bottom frame and is suitable for driving the top frame to move up and down; the speed limiting assembly is arranged on the underframe, is connected with the executing component and is suitable for driving the executing component when the underframe exceeds the speed.

The overspeed brake vehicle for the rack rail clamping vehicle as described above, further preferably, the overspeed protector further comprises a hydraulic control assembly, and the hydraulic control assembly comprises an oil tank assembly, a control oil path, an execution oil path and a quick release valve; the control oil circuit is arranged between the oil tank assembly and the speed limiting assembly, and the execution oil circuit is arranged between the oil tank assembly and the execution component; the quick release valve is respectively communicated with the control oil way and the execution oil way and used for adjusting the oil pressure of the execution oil way according to the oil pressure of the control oil way.

In the overspeed brake vehicle for a rack rail railcar according to the above, it is further preferable that an overflow valve, a first control valve, and a second control valve are provided on the control oil path, and the overflow valve is used for controlling the pressure of the control oil path; the first control valve is connected with the speed limiting assembly, one end of the second control valve is connected with the quick release valve, and the other end of the second control valve is linked with the first control valve.

The overspeed brake vehicle for a rack rail truck as described above, further preferably, the drive assembly includes a motor and a drive wheel, the motor is mounted on the head frame, and an output shaft is connected with the drive wheel; the speed limiting assembly comprises a centrifugal releaser and a throwing wheel valve group; the throwing wheel valve group comprises a valve body and a valve block; the valve block is provided with the valve body and the first control valve, the valve body can slide relative to the valve block to be far away from or close to the valve block, and when the valve body is close to the valve block, a valve core of the first control valve is driven to control the first control valve; the centrifugal releaser is arranged on the output shaft, the outer periphery of the centrifugal releaser is positioned on the outer side of the valve body, and the centrifugal releaser is suitable for driving the valve body.

In the overspeed brake vehicle for a rack rail railcar as described above, it is further preferable that the number of the first control valves is two, and the two control valves are connected in parallel to the control oil passage.

The overspeed brake vehicle for the rack rail clamping vehicle is further preferably characterized in that a groove, a protrusion and an inclined plane are arranged on the working surface of the valve body, and the inclined plane is positioned between the groove and the protrusion; the groove corresponds to one first control valve, and the bulge corresponds to the other first control valve; and a manual actuator is further arranged on the side wall of the valve body and is suitable for pulling the valve body, so that the inclined surface drives the valve core of the first control valve to control the first control valve.

In the overspeed brake vehicle for a rack rail stuck vehicle as described above, it is further preferable that the overspeed protector is further provided with a minimum pressure valve, one end of the minimum pressure valve is communicated with the control oil passage, and the other end of the minimum pressure valve is communicated with the execution oil passage; and the execution oil path is also provided with a first stop valve and a second stop valve which are connected in series.

The overspeed brake vehicle for a rack and rail truck as described above, further preferably, said brake assembly comprises a brake arm, a brake shoe and a mounting clip; the brake arm is including being swing arm and the brake arm of L type connection, the tip of swing arm install in on the chassis, the upper surface of brake arm passes through the installation card is installed the brake hoof, the brake hoof upper surface with the adaptation of card rail.

The overspeed brake vehicle for the rack rail clamping vehicle further preferably comprises a main machine body, wherein the main machine body comprises two top frames and four bottom frames, each bottom frame is provided with one driving assembly and one bearing wheel set, and each top frame is provided with two braking assemblies; the four bottom frames are divided into two groups, and the two bottom frames in each group are connected through a pivot and are used for being matched with the two clamping rails; each group of the underframe is provided with one top frame.

The overspeed brake vehicle for the rack rail clamping vehicle is further preferably characterized in that the top frame is further provided with a guide assembly, the guide assembly comprises a connecting frame and a guide wheel, the upper end of the connecting frame is mounted on the top frame, the lower end of the connecting frame is mounted with the guide wheel, the guide wheel is located on the outer side of the clamping rail, and a gap is formed between the rim of the guide wheel and the clamping rail.

The overspeed brake vehicle for the rack rail clamping vehicle is further preferably characterized in that the number of the top frames is two, and the bottom of each top frame is provided with one underframe; two bearing wheel sets and one driving assembly are arranged on each top frame, and each of the two driving assemblies corresponds to one clamping rail; and four brake assemblies are arranged on each underframe and are respectively arranged at two ends of the underframe.

The invention discloses an overspeed brake vehicle for a rack rail clamping vehicle, which comprises an underframe, a pricing and overspeed protector, wherein two ends of a top frame are respectively provided with a bearing wheel set and a driving assembly; the underframe is arranged below the underframe, and two ends of the underframe are provided with brake components; an elastic component is arranged between the top frame and the bottom frame, and the positions of the top frame and the bottom frame can be changed by the compression of the elastic component or not; the overspeed protector comprises a speed limiting assembly and an executing component, wherein one end of the executing component is connected with the top frame, the other end of the executing component is connected with the bottom frame and is suitable for driving the top frame to move up and down, and the speed limiting assembly is arranged on the bottom frame, is connected with the executing component and is suitable for driving the executing component when the bottom frame is overspeed. In the structure, the actuating component, the speed limiting component and the elastic component which can drive the top frame to move up and down are arranged to drive the top frame to move up and down relative to the bottom frame, so that the braking component is driven to move up and down, and the clamping and braking with the clamping rail are realized. The braking structure of the structure is compact, and the center of gravity of the whole overspeed braking vehicle is lower, so that the side turning phenomenon caused by the fact that the head is heavy and the feet are light when the heavy object is conveyed in the braking vehicle in the prior art is avoided, and the whole structure is stable.

According to the invention, the brake arm and the guide assembly of the brake assembly are arranged on two sides of the clamping rail and can be matched with the top surface of the clamping rail, so that the clamping rail can be clamped when the overspeed brake vehicle inclines, and the side turning is avoided.

In the invention, the overspeed protector also comprises a hydraulic control assembly which controls the large pressure loop by using the small pressure loop, so that the precision and the sensitivity of the control loop are improved; in addition, a plurality of valves and triggers which can be manually controlled are arranged in the hydraulic control assembly, so that the combination of manual control and automatic control is realized, and the operation safety of the hydraulic control assembly is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a front view of an over speed brake for a rack and pinion railcar according to the present invention;

FIG. 2 is a top plan view of an over speed brake application for a rack and pinion railcar in accordance with the present invention;

FIG. 3 is a bottom view of an over speed brake for a rack and pinion railcar according to the present invention;

FIG. 4 is a left side view of the overspeed brake rigging for a rack rail railcar according to the present invention;

FIG. 5 is a sectional view taken along line A-A of FIG. 2 in a braking state;

FIG. 6 is a cross-sectional view taken along line A-A of FIG. 2 in a non-braking state;

fig. 7 is a control diagram of the hydraulic control system of the present invention.

Description of reference numerals:

1-rail, 2-clip rail, 3-tooth rail, 4-top frame, 5-bottom frame, 6-driving wheel, 7-bearing wheel, 8-brake arm, 9-brake shoe, 10-connecting frame, 11-guide wheel, 12-connecting bolt, 13-brake oil cylinder, 14-elastic component, 15-motor, 16-oil tank, 17-disc spring, 18-piston cylinder, 19-output shaft, 20-centrifugal releaser, 21-valve body, 22-mounting clip, 23-first control valve, 24-flail wheel valve group, 25-mounting block, 26-cross bar, 27-manual actuator, 28-manual pump, 29-pneumatic pump, 30-hydraulic oil tank, 31-pressure gauge, 32-throttle valve; 33-a second control valve; 34-minimum pressure valve, 35-high pressure filter, 37-quick release valve; 38-a pressure limiting valve, 39-a first intermediate valve, 40-a second intermediate valve.

Detailed Description

The overspeed brake vehicle disclosed in this embodiment is mainly used for a rack rail truck, wherein a track 1 for carrying the rack rail truck comprises two truck rails 2 and a rack rail 3, and the two truck rails 2 are respectively located on two sides of the rack rail 3.

Fig. 1 is a front view of an overspeed brake vehicle for a rack rail clamp in the present embodiment, fig. 2 is a top view of the overspeed brake vehicle for a rack rail clamp in the present embodiment, and fig. 3 is a bottom view of the overspeed brake vehicle for a rack rail clamp in the present invention; fig. 4 is a left side view of the overspeed brake car for rack rail trucks of the present invention. As shown in fig. 1 to 4, the overspeed brake vehicle for a rack rail truck disclosed in the present embodiment includes:

the brake device comprises a base frame 5, wherein brake components are arranged at two ends of the base frame 5, are positioned at the outer side of the clamping rail 2 and are suitable for pressing the clamping rail 2 when the base frame 5 moves upwards;

the top frame 4 is arranged above the bottom frame 5, and two ends of the top frame 4 are provided with a bearing wheel set and a driving assembly; the bearing wheel set is arranged on the clamping rail 2; the driving component is matched with the clamping rail 2 and is suitable for driving the top frame 4 to move on the clamping rail 2;

an elastomeric assembly 14 including a piston cylinder 18 and an elastomer; the piston cylinder 18 is positioned below the bottom frame 5, and a piston penetrates through the bottom frame 5 to be connected with the top frame 4; one end of the elastic body is connected with the bottom frame 5, the other end of the elastic body is connected with a base of the piston cylinder, and when the piston extends, the elastic body is in a compressed state;

the overspeed protector comprises a speed limiting assembly and an execution component; one end of the executing component is connected with the top frame 4, and the other end of the executing component is connected with the bottom frame 5 and is suitable for driving the top frame 4 to move up and down; the speed limiting assembly is arranged on the underframe 5, is connected with the executing component and is suitable for driving the executing component when the underframe 5 exceeds the speed.

Specifically, in this embodiment, the number of the top frames 4 is two, two top frames 4 are connected front and back (with reference to the advancing direction of the overspeed brake vehicle) through a pivot, and each top frame 4 is connected with one underframe 5 through an actuating component and an elastic component 14. The above-mentioned connection is used to adapt the overspeed brake vehicle to different shapes of the track 1, so that the overspeed brake vehicle can normally run. Furthermore, each top frame 4 is provided with one driving assembly and two bearing wheel sets, the two bearing wheel sets on each top frame 4 are respectively matched with the two clamping rails 2, and the two driving assemblies on the two bottom frames 5 are respectively matched with the two clamping rails 2; two ends of each underframe 5 are provided with two brake assemblies. The number of the speed limiting assemblies is two, the speed limiting assemblies correspond to the two driving assemblies respectively, and the speed limiting assemblies are used for monitoring the two driving assemblies respectively.

Further, the bearing wheel set comprises a bearing wheel 7, a cross rod 26 and a cushion block, the bearing wheel 7 is installed at one end of the cross rod 26 through the rolling bearing, the other end of the cross rod 26 is installed on an adjusting block of the top frame 4 through a screw, the adjusting block is used for adjusting the height between the cross rod 26 and the top frame 4, and the cushion block is arranged between the cross rod 26 and the adjusting block. In the above structure, the cross bar 26 is rotatable with respect to the upper frame 4, and the carrier wheel 7 is rotatable with respect to the cross bar 26. Through the arrangement of the structure, the bearing wheel set can bear the overspeed brake vehicle and the load, and can adjust the relative position of the top frame 4 according to the shape of the track 1, so that the bearing wheel set is matched with the two clamping rails 2, and the bearing wheel set is convenient for handling uneven, inclined or bent tracks 1.

The driving assembly comprises a motor 15 and a driving wheel 6, the motor 15 is arranged on the top frame 4, and an output shaft 19 is connected with the driving wheel 6; the driving wheel 6 is contacted with the top surface of the clamping rail 2 and drives the overspeed brake vehicle to move on the clamping rail 2 of the gear rail 3 through friction.

Further, in the above structure, the brake assembly includes a brake arm 8, a brake shoe 9 and a mounting clip 22; brake arm 8 is including being swing arm and the brake arm of L type connection, the tip of swing arm install in on the chassis 5, the upper surface of brake arm passes through installation card 22 is installed brake shoe 9, brake shoe 9 upper surface with the adaptation of card rail 2. In this embodiment, the swing arm moves up and down under the action of the elastic component 14 along with the base frame 5, and presses the top of the clamping rail 2 when moving upwards, so as to realize braking.

Further, in the above structure, the actuating unit is a brake cylinder 13, a base of the brake cylinder 13 is connected to the top frame 4, a piston rod is connected to the bottom frame 5, a piston and a piston rod in the brake cylinder 13 divide a hydraulic chamber into two parts, and one of the hydraulic chambers is communicated with the oil tank assembly through an actuating oil path.

Further, in the structure, still be equipped with the direction subassembly on roof-rack 4, the direction subassembly includes link 10 and leading wheel 11, the upper end fixed mounting of link 10 is in on roof-rack 4, it is concrete, the upper end fixed mounting of link 10 in on the installation piece 25 of roof-rack 4 lower surface, the lower extreme is installed leading wheel 11, leading wheel 11 is located the card rail 2 outside, just the rim of leading wheel 11 with be equipped with the clearance between the card rail 2. Preferably, the guide wheel 11 is mounted obliquely with its inner rim inclined upwards and adapted to engage with the corner of the outer side of the clamping rail 2 in the driving state of the overspeed braking vehicle, and to have clearance with the outer side of the clamping rail 2 in the braking state of the overspeed braking vehicle.

Two brake cylinders 13 and four elastic assemblies 14 are arranged between each top frame 4 and the bottom frame 5, the two brake cylinders 13 and the four elastic assemblies 14 are arranged in a rectangle, one brake cylinder 13 and the two elastic assemblies 14 form one side in the rectangle, and the two brake cylinders 13 are positioned at the opposite corners of the rectangle.

Furthermore, the elastic body in the elastic component 14 is a plurality of disc springs 17, and the disc springs 17 are sleeved outside the piston cylinder 18.

Further, the two ends of the overspeed brake car of this embodiment are also provided with connecting structures, and connecting bolts 12 are arranged in the connecting structures and used for connecting the overspeed brake car with other parts of the rail clamping car.

Further, in the above structure, the overspeed protector further comprises a hydraulic control assembly, and the hydraulic control assembly comprises an oil tank assembly, a control oil path, an execution oil path, and a quick release valve 37; the control oil circuit is arranged between the oil tank assembly and the speed limiting assembly, and the execution oil circuit is arranged between the oil tank assembly and the execution component; the quick release valve 37 is respectively communicated with the control oil path and the execution oil path, and is used for adjusting the oil pressure of the execution oil path according to the oil pressure of the control oil path.

In this embodiment, the oil tank assembly includes a hydraulic oil tank 30, a pneumatic pump 29 and a manual pumping pump, wherein the pneumatic pump 29 and the manual pumping pump are respectively communicated with the hydraulic oil tank 30. The pneumatic pump 29 is of an electric structure, the manual pressurizing pump is of a manual structure, the functions of the pneumatic pump and the manual pressurizing pump are the same, and the hydraulic oil tank 30 can be independently pressurized to improve the oil pressure of a control oil path and an execution oil path.

The quick release valve 37 is mainly used for adjusting the ratio of input pressure to output pressure, and in this embodiment, the pressure difference between the execution oil path and the control oil pressure is realized by using the characteristic of the quick release valve 37, so that the large oil pressure in the execution oil path is controlled by the small oil pressure in the control oil path. Specifically, two oil paths are arranged in the quick release valve 37, one oil path is communicated with the control oil path, the other oil path is communicated with the execution oil path, and the pressures at the two ends of the quick release valve 37, namely the pressures in the control oil path and the execution oil path, are kept balanced when the oil tank assembly is pressed, so that the quick release valve 37 is kept in a closed state. Wherein the limit of the pressurizing pressure of the tank assembly is determined by the control oil passage. The actuating oil circuit can adjust the brake cylinder 13 to extend a piston rod of the brake cylinder, so that the bottom frame 5 moves downwards relative to the top frame 4 to compress the elastic body, and then the brake assembly is opened, and the overspeed brake vehicle is in a normal running state, as shown in fig. 6. When the pressure relief event occurs in the control oil path, the pressure at the two ends of the quick release valve 37 is unbalanced and opened, so that the pressure of the execution oil path is quickly relieved, the pressure at the two ends of the brake oil cylinder 13 is changed, the piston rod of the brake oil cylinder 13 loses the supporting action and moves, the elastic body resets, the chassis 5 moves upwards, and the brake assembly is pressed on the track 1 to realize braking; in the process, the elastic body acts on the bottom frame 5 and the top frame 4 simultaneously, when the bottom frame 5 moves upwards to drive the brake assembly to compress the track 1, the bottom frame 5 does not move, the elastic body starts to pull the top frame 4 downwards through the piston rod, so that the top frame 4 is driven to move downwards, the top frame 4 moves downwards to drive the guide assembly to move downwards simultaneously, and a gap exists between the guide wheel 11 and the clamping rail 2, as shown in fig. 5.

In the above structure, an overflow valve, the first control valve 23 and the second control valve 33 are arranged on the control oil path, and the overflow valve is used for controlling the pressure of the control oil path; the first control valve 23 is connected with the speed limiting assembly, one end of the second control valve 33 is connected with the quick release valve 37, and the other end of the second control valve is linked with the first control valve 23.

The pressure of the control oil way is limited by the overflow valve in the control oil way, on one hand, the pressure does not exceed a limit value, and then the ratio of the pressures at two ends of the quick release valve 37 is controlled, on the other hand, the pressure of the control oil way is reduced, so that the difficulty of changing the pressure of the control oil way is reduced, and the precision of the control oil way is improved. In order to realize the accurate control of the oil pressure of the control oil circuit, a pressure gauge 31 is also arranged in the control oil circuit to check the pressure of the control oil circuit. The control circuit controls the pressure relief event by providing a first control valve 23. When the specific first control valve 23 is opened, rapid pressure relief can be realized. The second control valve 33 is used for adjusting the pressure on the side where the quick release valve 37 communicates with the control oil passage. First control valve 23 and second control valve 33 all locate control oil is last, can the high-speed joint movement, keep the uniformity of pressure release.

In the above structure, the driving assembly comprises a motor 15 and a driving wheel 6, the motor 15 is mounted on the top frame 4, and an output shaft 19 is connected with the driving wheel 6; the speed limiting assembly comprises a centrifugal releaser 20 and a throwing wheel valve group 24; the throwing wheel valve group 24 comprises a valve body 21 and a valve block; the valve block is provided with the valve body 21 and the first control valve 23, and the valve body 21 can slide relative to the valve block to be far away from or close to the valve block and drive a valve core of the first control valve 23 to control the first control valve 23 when the valve body is close to the valve block; the centrifugal releaser 20 is mounted on the output shaft 19, and the outer circumference edge is located outside the valve body 21 and is adapted to drive the valve body 21. In the above structure, the centrifugal releaser 20 is a finished structure, and its main structure is a centrifugal flyweight, when the rotor assembly rotates at high speed, the centrifugal flyweight is similar to a conical pendulum, and generates a centrifugal phenomenon to move outwards, and the sliding shaft coupled with the centrifugal flyweight also moves outwards, and the distance of the outward movement of the sliding shaft has a corresponding relation with the speed of rotation of the rotor assembly shaft, and then the starting of the brake switch is controlled by the device installed in the axial direction of the sliding shaft, so as to achieve the purpose of triggering the safety brake response. In this embodiment, the centrifugal releaser is mounted on the output shaft 19 and is used for detecting the rotation speed of the driving wheel 6, and further triggering the valve body 21 when the rotation speed of the driving wheel 6 exceeds a certain range, so that the valve body 21 moves towards the valve block, and then the valve core of the first control valve 23 is triggered, so that the valve core of the first control valve 23 moves to open the first control valve 23, and the pressure of the first control valve 23 is rapidly released.

In the above configuration, the number of the first control valves 23 is two, and the two control valves are connected in parallel to the control oil path. The present embodiment ensures that when a problem occurs in one first control valve 23, the other first control valve 23 can also operate the control oil path safely and reliably by providing two first control valves 23.

In the structure, a groove, a protrusion and an inclined plane are arranged on the working surface of the valve body 21, and the inclined plane is positioned between the groove and the protrusion; the groove corresponds to one first control valve 23, and the protrusion corresponds to the other first control valve 23; a manual actuator 27 is further disposed on the side wall of the valve body 21, and the manual actuator 27 is adapted to pull the valve body 21 so that the inclined surface drives the spool of the first control valve 23 to control the first control valve 23. In the embodiment, by optimizing the structure of the valve body 21, when the relative distance between the valve body 21 and the valve block is not changed, the valve core of the first control valve 23 is triggered by pulling the valve body 21, and then the first control valve 23 is manually controlled.

In the above structure, the overspeed protector is further provided with a minimum pressure valve 34, one end of the minimum pressure valve 34 is communicated with the control oil path, and the other end is communicated with the execution oil path; and a first check valve 39 and a second check valve 40 are further arranged on the execution oil path, and the first check valve 39 and the second check valve 40 are connected in series. The present embodiment prevents the control oil passage and the actuation oil passage from being damaged by the instantaneous pressurization of the tank assembly by providing the minimum pressure valve 34, thereby protecting the control oil passage and the actuation oil passage. The first check valve 39 is arranged on the top frame 4, the second check valve 40 is arranged in the operation chamber, and the first check valve 39 and the second check valve 40 are used for releasing pressure of a control oil path through manual operation, so that the manual operation of the hydraulic control assembly is realized.

In this embodiment, the overspeed protector, the control valve and the actuator which are arranged on the whole oil circuit form a hydraulic control system, and in addition, in order to perfect the performance of the hydraulic control system and ensure the normal operation of the hydraulic control system, other valve bodies are also arranged. Specifically, a control diagram of the entire hydraulic control system is shown in fig. 7.

After being filtered by a high-pressure filter 35, hydraulic oil from the hydraulic oil tank is divided into a control oil path and an execution oil path at the throttle valve 32, wherein the hydraulic oil in the execution oil path flows to the two brake cylinders through two quick release valves 37 respectively; the hydraulic oil in the execution oil path flows to the first control valve 23 and the second control valve 33 after being limited by the pressure limiting valve 38, and is connected with the quick release valve 37 through the second control valve 33, and a pressure gauge 31 is further arranged on the oil path in order to ensure the normal operation of the control oil path. In addition, a minimum pressure valve 34 is provided between the control oil passage and the execution oil passage, and a first check valve and a second check valve are provided on the execution oil passage.

Further, the embodiment also discloses a use method of the overspeed braking vehicle for the gear rack 3 vehicle, which comprises the following steps:

first, the limit brake car for the gear rack 3 car is assembled in the above manner and placed on the gear rack 3 with the carrier wheel 7 and the drive wheel 6 placed on top of the truck rail 2, the guide wheel 11 and the brake shoe 9 located outside the truck rail 2, while the elastic assembly 14, the speed limiting assembly, the actuator assembly and the hydraulic control assembly are checked to ensure proper operation.

The operation state is as follows: the hydraulic oil tank 30 is pressurized by the pneumatic pump 29 or the manual pump 28, the pressure in the initial stage of pressurization decreases, the minimum pressure valve 34 is opened, and the control oil passage and the execution oil passage are communicated. When the pressure in the oil passage gradually rises and exceeds the set value of the minimum pressure valve 34, the minimum pressure valve 34 is closed. The oil pumped out by the pumping pump passes through the high pressure filter 35 and then flows to the control oil path and the execution oil path respectively. Because the control oil path is provided with the throttle valve 32, most of oil flows into the execution oil path during pressurizing and flows into the brake oil cylinder 13 through the quick release valve 37 in the execution oil path, and after the pressure reaches a set value, the piston of the brake oil cylinder 13 moves to drive the underframe 5 to move downwards, so that the elastic body is compressed, the brake assembly is separated from the clamping rail 2, and the brake assembly does not work. The hydraulic oil passing through the throttle valve 32 flows to the first control valve 23 and the second control valve 33 through a pressure limiting valve 38, at this time, the first control valve 23 and the second control valve 33 are both in a closed state, and because one end of the second control valve 33 is communicated with the quick release valve 37, the pressure in the upper and lower control cavities of the quick release valve 37 is kept balanced, and then the hydraulic oil is in a closed state. When the pressures in the execution oil passage and the control oil passage reach set values, the pneumatic pump 29 or the manual pump 28 stops pressurizing, and the whole system pressure is kept within a certain value.

A braking state: when the speed of the output shaft 19 in the driving assembly exceeds a set value, the flyweight of the centrifugal releaser 20 is thrown out, the valve body 21 is driven to move towards the valve block, the valve core of the first control valve 23 is opened when the valve block is approached, the first control valve 23 is in an open state, the control oil way is rapidly decompressed at the moment, the second control valve 33 is driven to synchronously decompress, then the pressures of the upper end and the lower end of the quick release valve 37 are unbalanced, the pressure of the lower end is large, the valve core of the quick release valve 37 moves to an open position, the quick release valve 37 rapidly decompresses, the oil way is rapidly decompressed, the brake oil cylinder 13 cannot realize pressure balance, the piston rod moves, the spring resets, the bottom plate is driven to move upwards, and then the brake assembly is driven to move upwards to compress the track 1 through.

In addition, the first check valve 39 and the second check valve 40 arranged on the execution oil path and the manual actuator 27 arranged on the wheel throwing valve group 24 can realize rapid pressure relief, so that braking is realized; the overspeed braking vehicle can also be in a braking state under the action of the elastic body when the braking system fails.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.