CN211401658U - Fatigue test device for forklift brake cylinder - Google Patents
Fatigue test device for forklift brake cylinder Download PDFInfo
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- CN211401658U CN211401658U CN202020251187.3U CN202020251187U CN211401658U CN 211401658 U CN211401658 U CN 211401658U CN 202020251187 U CN202020251187 U CN 202020251187U CN 211401658 U CN211401658 U CN 211401658U
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Abstract
The utility model discloses a fatigue test device of a forklift brake cylinder, which comprises a power mechanism for providing hydraulic pressure for the brake cylinder and a test bed for installing the brake cylinder, wherein the hydraulic output end of the power mechanism is connected with the brake cylinder; the test bed comprises a frame, a return mechanism and an adjusting assembly; a wheel cylinder mounting plate is mounted on one side of the frame, and a brake wheel cylinder is fixedly mounted on the wheel cylinder mounting plate and is positioned in a wheel cylinder cavity of the frame; piston rods of the wheel cylinders at two ends of the brake wheel cylinder are hinged with guide rods of the return mechanism, the guide rods are connected with guide plates of the adjusting assembly, and a first guide sleeve and a second guide sleeve are sleeved on the guide rods; one end of the second guide sleeve is connected with a limiting bolt of the adjusting assembly. The utility model discloses a brake wheel cylinder fatigue test platform simulation wheel cylinder actual work atress condition develops the tired examination in the product life cycle, verifies the reliability of wheel cylinder, and this fatigue test platform can satisfy the brake wheel cylinder detection of different specifications.
Description
Technical Field
The utility model relates to a fork truck braking wheel cylinder technical field especially relates to a fatigue test device of fork truck braking wheel cylinder.
Background
The forklift service brake is an important safety component of the forklift, and the reliability of the forklift service brake is very important. At present, in 1 ~ 10 tons of counter-weight formula fork truck brakes, mainly adopt drum brake, drum brake mainly comprises parts such as brake cylinder, return spring, brake shoe, lash adjuster and backing plate, and its theory of action is: applying a braking force on a pedal to act on a brake master cylinder, sending pressure oil in the brake master cylinder to a slave cylinder of a brake through a brake oil pipe at a certain pressure, moving pistons of the slave cylinder to two sides under the action of hydraulic oil to push left and right brake shoes to expand outwards so as to enable the left and right brake shoes to be in contact with the inner wall of a brake drum fixed on a car, and forcing the rotating speed of the brake drum to be reduced by the friction force between the brake shoes and the brake drum to generate a braking action; when the braking force is relieved, the hydraulic pressure of the hydraulic system is reduced, the piston of the brake cylinder returns under the action of the return spring, the left brake shoe and the right brake shoe also return, the brake shoes are separated from the brake drum, and the braking effect is eliminated.
The service life and reliability of the brake cylinder are key indexes of the brake, and a brake cylinder fatigue test bed is required for testing; meanwhile, the corresponding brake load specifications of the balance weight type forklift carrying different tonnages are different, for example, the 1-10 ton counter-balanced forklift brake comprises seven specifications of brake, namely 1-1.5 ton forklift brake, 2-2.5 ton forklift brake, 3-3.5 ton forklift brake, 4-5 ton forklift brake, 5-7.5 ton forklift brake, 2-2.5 ton electric forklift brake and 8-10 ton forklift brake, the seven forklift brakes correspondingly adopt brake cylinders with different specifications, the installation angles of the brake cylinders in the corresponding brakes are different from the actual use strokes of cylinder pistons, the actual working stress conditions of the brake cylinders with various specifications can not be simulated by the same brake cylinder fatigue test device, the reliability work of the brake cylinders can not be ensured, therefore, the existing brake cylinder fatigue test bed cannot meet the fatigue performance detection of brake cylinders with various specifications.
SUMMERY OF THE UTILITY MODEL
To above-mentioned defect or not enough, the utility model aims to provide a fatigue test device of fork truck brake wheel cylinder.
In order to achieve the above purpose, the technical scheme of the utility model is that:
a fatigue test device for a forklift brake cylinder comprises a power mechanism for providing hydraulic pressure for the brake cylinder and a test bed for mounting the brake cylinder, wherein the hydraulic output end of the power mechanism is connected with the brake cylinder; the test bed comprises a frame, a return mechanism for providing a load force and an adjusting assembly for adjusting the test stroke of the brake cylinder; a wheel cylinder mounting plate is mounted on one side of the cavity of the frame, the brake wheel cylinder is fixedly mounted on the inner side of the wheel cylinder mounting plate and is positioned in the frame, through holes are symmetrically formed in two ends of the frame, and the through holes are communicated with the cavity of the frame; the brake cylinder is characterized in that cylinder piston rods at two ends of the brake cylinder are both connected with return mechanisms with the same structure, guide rods of the return mechanisms are hinged with the cylinder piston rods, a first guide sleeve and a second guide sleeve are sleeved on the guide rods in a clearance fit manner, a return spring is arranged between the first guide sleeve and the second guide sleeve and sleeved on the guide rods, and the guide rods are connected with guide plates of the adjusting assembly; one end of the second guide sleeve is clamped with the outer side port of the frame through hole, and the other end of the second guide sleeve extends to the outer side of the frame and is connected with a limiting bolt of the adjusting assembly.
One end of the piston rod of the branch pump is hinged with the piston ball of the branch pump, and the other end of the piston rod of the branch pump is hinged with the guide rod pin shaft; one end of the first guide sleeve is connected with the return spring, and the other end of the first guide sleeve is matched with a shaft shoulder of the guide rod; one end of the guide rod, which is far away from the brake cylinder, penetrates through the through hole of the frame and extends to the outer side of the frame to be connected with the guide plate of the adjusting assembly.
An installation groove is radially formed in the extension section of the second guide sleeve, and the guide plate is located in the installation groove; a third guide sleeve is sleeved on the first guide sleeve, an inner hole of the third guide sleeve is in clearance fit with the outer wall of the first guide sleeve, and the third guide sleeve is located at the inner side port of the through hole of the frame.
The limiting bolt of the adjusting assembly comprises a first nut and a first bolt which are arranged at the end part of the second guide sleeve and matched with each other, and a second nut and a second bolt which are arranged at the outer side of the top end of the guide plate; the guide plate is fixedly arranged at the end part of the guide rod through a second screw, a threaded hole is axially formed in the upper end of the guide plate, a first screw is arranged in the threaded hole in a matched mode, the second screw is arranged in a second nut in a threaded fit mode, and the second screw is perpendicular to the first screw; the first nut is fixedly welded at the end part of the second guide sleeve, the first bolt is in threaded fit with the first nut, and one end of the first bolt penetrates through the first nut and is positioned in the mounting groove of the second guide sleeve; the first bolt is sleeved with a back nut used for locking the first bolt.
The power mechanism is a hydraulic oil hydraulic pump station, a hydraulic oil pressure output end of the hydraulic oil hydraulic pump station is connected with the brake cylinder through an oil conveying pipe, and an oil way of the hydraulic oil hydraulic pump station is connected with a hydraulic oil tank through a pressure oil control electromagnetic directional valve, an overflow valve and an oil pump in sequence; the oil inlet end of the overflow valve is connected with a first oil pressure gauge, and the oil inlet end of the oil pump is connected with an oil filter. When the power mechanism is a hydraulic oil hydraulic pump station, the hydraulic oil output end of the hydraulic oil hydraulic pump station is communicated with the oil inlet cavity of the brake cylinder through an oil conveying pipe.
The power mechanism is a brake fluid hydraulic pump station, the brake fluid output end of the brake fluid hydraulic pump station is connected with a brake branch pump through an oil conveying pipe, and the pneumatic energy of the brake fluid hydraulic pump station is connected with a workshop compressed air source through a forklift brake master cylinder, a cylinder and a compressed air control electromagnetic directional valve in sequence; the hydraulic input end of fork truck brake master cylinder is connected with the brake fluid liquid storage pot, and the hydraulic output end and the braking wheel cylinder of fork truck brake master cylinder are connected, the hydraulic output end of fork truck brake master cylinder still is connected with the second oil pressure gauge, the inlet end of workshop compressed air source is connected with the filtration combination, the power take off end of cylinder is connected with the piston of fork truck brake master cylinder, works as when power unit is brake fluid hydraulic power unit, the brake fluid output end of fork truck brake master cylinder is linked together through defeated oil pipe and the oil feed chamber of braking wheel cylinder.
And the electromagnetic reversing valve of the brake fluid hydraulic pump station and the electromagnetic reversing valve of the hydraulic oil hydraulic pump station are connected with an electric cabinet for controlling output pressure oil through wires.
The electric cabinet comprises touch-sensitive screen PLC all-in-one, circuit breaker, switching power supply, relay, pilot lamp.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a fatigue test device of fork truck brake cylinder, in order to detect the fatigue performance of multiple specification brake cylinder, simulate the actual work atress condition of cylinder through brake cylinder fatigue test bench, develop the fatigue examination in the product life cycle, verify the reliability of cylinder, this fatigue test bench can satisfy the brake cylinder detection of different specifications; the eccentric amount generated by hinging the brake cylinder and the guide rod ensures that a cylinder piston rod has an inclination angle alpha after being installed, the size of the inclination angle is the same as the installation angle of the brake cylinder during actual use, and the actual working stress condition of the brake cylinders with various specifications is simulated; the stroke of the piston rod of the branch pump is adjusted through the stroke adjusting screw and the nut, so that the stroke is the same as the actual use stroke, and the detection of brake branch pumps of different specifications is met.
Drawings
FIG. 1 is a schematic view of the structure of the device of the present invention;
FIG. 2 is a schematic view of the mounting structure of the test stand of FIG. 1;
FIG. 3 is a first schematic view of the mounting structure of the guide bar of FIG. 1;
FIG. 4 is a second schematic view of the mounting structure of the guide bar of FIG. 1;
fig. 5 is a schematic view of the installation structure of the adjusting assembly of the present invention;
FIG. 6 is a schematic circuit diagram of the electrical cabinet of FIG. 1;
FIG. 7 is a hydraulic schematic diagram of the hydraulic oil pumping station of FIG. 1;
fig. 8 is a schematic diagram of the hydraulic and pneumatic principles of the brake hydraulic pump station in fig. 1.
In the figure, 1, an electric cabinet; 2-brake hydraulic pump station; 21-a master cylinder of a forklift truck; 22-a cylinder; 23-compressed air control electromagnetic directional valve; 24-brake fluid reservoir; 25-a second oil pressure gauge; 26-air filtration combination; 3-hydraulic oil hydraulic pump station; 31-pressure oil control electromagnetic directional valve; 32-relief valve; 33-an oil pump; 34-a first oil pressure gauge; 35-an oil filter; 4, a guide rod; 51-a first guide sleeve; 52-second guide sleeve; 53-third guide sleeve; 6-cylinder piston rod; 7, braking a cylinder; 8-a return spring; 91 — a second bolt; 92-a second nut; 93 — a first screw; 94-a first nut; 95 — first bolt; 96-a guide plate; 97 — second screw; 98-back-tightened nut; 10-test bed; 11-a frame; 12-a wheel cylinder mounting plate; 13-end cap.
Detailed Description
The present invention will be described in detail with reference to the drawings, and it should be understood that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
As shown in fig. 1 to 8, the fatigue test device for the brake cylinder of the forklift comprises a power mechanism for providing hydraulic pressure for the brake cylinder 7 and a test bed 10 for mounting the brake cylinder 7, wherein the hydraulic output end of the power mechanism is connected with the brake cylinder 7; the test bed 10 comprises a frame 11, a return mechanism for providing a load force and an adjusting assembly for adjusting the test stroke of the brake cylinder, and the main body of the test bed 10 is the frame 11; a wheel cylinder mounting plate 12 is mounted on one side of a cavity of the frame 11, the wheel cylinder mounting plate 12 is fixedly mounted on the frame through screws, the wheel cylinder mounting plate 12 can be matched with wheel cylinder mounting plates 12 of different sizes according to the mounting positions and sizes of the wheel cylinders 7 of different types so as to be convenient to replace, the actual working stress condition of the wheel cylinders is simulated, fatigue check in the life cycle of a product is carried out, the reliability of the wheel cylinders of the brake is verified, the wheel cylinders 7 of the brake are fixedly mounted on the inner side of the wheel cylinder mounting plate 12 and located in the frame 11, through holes are symmetrically formed in two ends of the frame 11 and are communicated with the cavity of the frame 11; the brake cylinder 7 is characterized in that cylinder piston rods 6 at two ends of the brake cylinder 7 are respectively connected with a return mechanism with the same structure, a guide rod 4 of the return mechanism is hinged with the cylinder piston rods 6, a first guide sleeve 51 and a second guide sleeve 52 are sleeved on the guide rod 4 in a clearance fit manner, a return spring 8 is arranged between the first guide sleeve 51 and the second guide sleeve 52, the return spring 8 is sleeved on the guide rod 4, and the guide rod 4 is connected with a guide plate 96 of an adjusting assembly; one end of the second guide sleeve 52 is clamped with the outer side port of the through hole of the frame 11 through the end cover 13, the other end of the second guide sleeve extends to the outer side of the frame 11 and is connected with the limit bolt of the adjusting assembly, and the end cover 13 is fixed on the frame 11 through a screw and is positioned at the outer side of the through hole of the frame 11. Preferably, the extending section of the second guide sleeve 52 is radially opened with a mounting groove, and the guide plate 96 is located in the mounting groove.
Preferably, one end of the piston rod 6 of the branch pump is hinged with the piston ball of the branch pump, and the other end is hinged with the guide rod 4 through a pin shaft; one end of the first guide sleeve 51 is connected with the return spring 8, and the other end of the first guide sleeve is matched with a shaft shoulder of the guide rod 4; the end of the guide rod 4 far away from the brake cylinder 7 extends to the outside of the frame 11 through the through hole of the frame 11 and is connected with the guide plate 96 of the adjusting assembly. It should be noted that one end of the cylinder piston rod 6 is hinged to the piston ball of the brake cylinder 7, and the other end is hinged to the guide rod 4, so that the center line of the brake cylinder 7 and the center line of the guide rod 4 are not on the same straight line, and an eccentric amount is provided, and an installation included angle inclination angle α is formed, so that the brake cylinder piston rod 6 has an inclination angle α after installation, and according to the actual installation conditions of different brake cylinders, the eccentric amount of the brake cylinder 7 during installation is changed, so that inclination angles α with different sizes can be obtained, and the actual working stress conditions of the brake cylinders with various specifications can be simulated.
Further, a third guide sleeve 53 is sleeved on the first guide sleeve 51, an inner hole of the third guide sleeve 53 is in clearance fit with an outer wall of the first guide sleeve 51, and the third guide sleeve 53 is located at an inner side port of the through hole of the frame 11.
Specifically, the adjusting mechanism includes a cylinder piston stroke adjusting assembly mounted at one end of the guide rod and the second guide sleeve 52 and used for adjusting the cylinder piston stroke: the guide rod 4 can slide in the guide sleeve, the sliding stroke is determined according to the actual use conditions of different brake cylinders, and the stroke adjustment assembly of the piston of the cylinder is adjusted according to the stroke requirements of different cylinders to realize stroke adjustment; the limiting bolt of the adjusting assembly comprises a first nut 94 and a first bolt 95 which are arranged at the end part of the second guide sleeve 52 and matched with each other, and a second nut 92 and a second bolt 91 which are arranged at the outer side of the top end of a guide plate 96; the guide plate 96 is fixedly installed at the end part of the guide rod 4 through a second screw 97, a threaded hole is axially formed in the upper end of the guide plate 96, a first screw 93 is installed in the threaded hole in a matched mode, the first screw 93 is used for adjusting the installation position of the guide plate 96 in the installation groove of the second guide sleeve 52, so that the stroke S of the brake cylinder test is adjusted, the second bolt 91 is installed in the second nut 92 in a threaded fit mode, the second bolt 91 is perpendicular to the first screw 93, the second bolt 91 is used for fastening the first screw 93 and limiting the guide plate 96, the guide rod 4 reciprocates in the test process, and the guide rod 4 is ensured to axially slide in the installation groove in the outer end of the second guide sleeve 52 and cannot rotate or rotate around the axis of the guide rod 4; the first nut 94 is fixedly welded to the end of the second guide sleeve 52, the first bolt 95 is in threaded fit with the first nut 94, and one end of the first bolt 95 penetrates through the first nut 94 and is located in the mounting groove of the second guide sleeve 52. The test stroke of the guide rod 4 is adjusted and limited, the distance of the first bolt 95 extending into the mounting groove of the second guide sleeve 52 is adjusted, and the test stroke S of the brake cylinder is further adjusted, so that the test stroke of the brake cylinders of various specifications is met. A back nut 98 for locking the first bolt 95 is sleeved on the first bolt 95; the distance between the end of the first bolt 95 and the second bolt 97 is the test stroke S of the wheel cylinder, and because the guide plate 96 is fixed at the end of the guide rod 4, and the guide plate can only slide in the groove at the outer end of the second guide sleeve 52 and can not rotate, the guide rod 4 can not rotate around the axis of the guide rod 4; the second screw 97 is a socket head cap screw.
In the embodiment 1 of the power mechanism in the device of the present invention, as shown in fig. 1 and 5, the power mechanism is a hydraulic oil hydraulic pump station 3, the hydraulic oil output end of the hydraulic oil hydraulic pump station 3 is connected to the brake cylinder 7 through an oil pipe, and the oil path of the hydraulic oil hydraulic pump station 3 is connected to the hydraulic oil tank sequentially through a pressure oil control electromagnetic directional valve 31, an overflow valve 32, and an oil pump 33; the oil inlet end of the overflow valve 32 is connected with a first oil pressure gauge 34, and the oil inlet end of the oil pump 33 is connected with an oil filter 35. When the power mechanism is the hydraulic oil hydraulic pump station 3, the output working medium is hydraulic oil, namely the working medium of the brake cylinder 7 is hydraulic oil, and the hydraulic oil output end of the hydraulic oil hydraulic pump station 3 is communicated with the oil inlet cavity of the brake cylinder 7 through an oil conveying pipe.
In the utility model discloses embodiment 2 of power unit in the device, as shown in fig. 1 and fig. 6, power unit is brake fluid hydraulic power unit 2, 2 brake fluid output ends of brake fluid hydraulic power unit are connected with brake wheel cylinder 7 through oil pipeline, the pneumatic energy of 2 brake fluid hydraulic power unit loops through fork truck brake master cylinder 21, cylinder 22, compressed air control electromagnetic directional valve 23 and is connected with workshop compressed air source; the hydraulic input end of the forklift brake master cylinder 21 is connected with a brake fluid storage tank 24, the hydraulic output end of the forklift brake master cylinder 21 is connected with the brake slave cylinder 7, the hydraulic output end of the forklift brake master cylinder 21 is further connected with a second oil pressure gauge 25, the air inlet end of the workshop compressed air source is connected with an air filtering combination 26, it needs to be explained that the air filtering combination 26 is an air filtering combination triplet, the power output end of the cylinder 22 is connected with the piston of the forklift brake master cylinder 21, and therefore the forklift brake master cylinder 21 is driven to work, brake fluid hydraulic pressure acts on the brake slave cylinder 7, and the brake slave cylinder 7 is driven to act. When the power mechanism is a brake fluid hydraulic pump station 2, the output working medium is brake fluid, namely the working medium of the brake cylinder 7 is brake fluid, and the brake fluid output end of the forklift brake master cylinder 21 is communicated with the oil inlet cavity of the brake cylinder 7 through an oil conveying pipe.
Preferably, as shown in fig. 1 and 4, the electromagnetic directional valve of the brake fluid hydraulic pump station 2 and the electromagnetic directional valve of the hydraulic oil hydraulic pump station 3 are both connected to the electric cabinet 1 for controlling the output pressure oil through a wire. Electric cabinet 1 is by the equipment in a box such as touch-sensitive screen PLC all-in-one (model is MM-30MR-4MT-700-FX-B), circuit breaker, switching power supply, relay and pilot lamp, and electric cabinet 1 does promptly the utility model discloses the electric system of device, control test bench 10 operating frequency, the count, experimental data record and storage adopt touch-sensitive screen PLC all-in-one to control, its convenient operation, experimental data record is accurate, and data display is directly perceived, makes the utility model discloses it is more automatic and intelligent. Specifically, the compressed air control electromagnetic directional valve 23 and the pressure oil control electromagnetic directional valve 31 are connected in parallel with the touch screen PLC all-in-one machine in the electric cabinet 1 through leads, the compressed air control electromagnetic directional valve 23 and the pressure oil control electromagnetic directional valve 31 are controlled through a switch, and the brake fluid hydraulic pump station 2 or the hydraulic oil hydraulic pump station 3 is selected to work; and the electromagnetic directional valves (the compressed air control electromagnetic directional valve 23 and the pressure oil control electromagnetic directional valve 31) are connected with a COM interface and a Y1 interface of the touch screen PLC all-in-one machine.
It should be noted that the electronic control system controls the brake hydraulic pump station 2 or the hydraulic oil hydraulic pump station 3 to output pressure oil, the pressure oil is input into a hydraulic cavity of the wheel cylinder 7 mounted on the mechanical part of the test bed 10 through an oil pipe, and the wheel cylinder piston is pushed to move towards two sides due to the action of the pressure oil, so that the wheel cylinder 7 starts to operate.
The electrical system controls the pressure oil to be output in a pulse mode, the time for keeping each output is shortest to 0.5 second and longest to be half an hour (for a pressure maintaining test), and the pressure oil is adjustable within the range, and the oil pressure unloading time between two outputs is shortest to 0.5 second and longest to be half an hour. The output frequency of the pressure oil is adjustable, and the output frequency of the common pressure oil is 1000 times/hour. Every time the test bed outputs pressure oil, the brake cylinder acts once, the counting is once, and the test stroke is as follows: the single side is 0-8 mm and is adjustable.
The utility model discloses a theory of operation and process:
1) during testing, the mounting position of the brake cylinder 7 is adjusted according to the specification and the actual using state of the brake cylinder 7, the brake cylinder 7 is fixedly mounted on the cylinder mounting plate 12, the cylinder mounting plates 12 with different sizes are matched according to different brake cylinder mounting positions and sizes, the cylinder mounting plate 12 can ensure that the inclination angle alpha of the brake cylinder piston rod 6 ensures the inclination angle alpha of the brake cylinder piston rod 6, and the cylinder piston stroke adjusting assembly is adjusted according to the testing stroke S of the tested brake cylinder, so that the sliding stroke of the guide rod 4 is equal to the using stroke of the brake cylinder.
2) Adjusting the test stroke S, specifically, after the wheel cylinder is mounted on a test bed, adjusting the lengths of first screws 93 at the left and right ends according to the mounting length L of the wheel cylinder, so that the distance from the groove bottoms of the left and right guide rods 4 to the symmetric center line of the test bed is L/2, and screwing down a second bolt 91 after adjustment, so that the lower end of the second bolt 91 is vertically pressed on the first screws 93 to prevent the first screws 93 from loosening; according to the test stroke S of the sub brake cylinder, the distance from the end of the first bolt 95 to the second screw 97 is adjusted to be S, the nut 98 is screwed to prevent the bolt 95 from loosening, and the test stroke is adjusted completely.
3) Selecting a working medium of the brake cylinder 7, for example, turning on the brake hydraulic pump station 2 and turning off the hydraulic oil hydraulic pump station 3, or turning on the hydraulic oil hydraulic pump station 3 and turning off the brake hydraulic pump station 2; and the hydraulic output end is connected with an oil inlet of the brake cylinder 7.
4) The test bed 10 is electrified, a start button on the electric cabinet 1 is operated, and a start instruction is sent to the brake fluid hydraulic pump station 2 or the hydraulic oil hydraulic pump station 3, so that the brake fluid hydraulic pump station 2 or the hydraulic oil hydraulic pump station 3 starts to work, and hydraulic oil or brake fluid is provided for the brake cylinder 7.
5) According to the test requirement, the frequency of pulse oil supply and the pressure maintaining and releasing time are set on the control panel of the electric cabinet 1.
6) And releasing the air release valve on the wheel cylinder 7, exhausting air in the wheel cylinder 7 and the oil way, and then screwing.
7) According to the test requirements of the brake cylinder 7, the overflow pressure of an overflow valve 32 on a hydraulic oil path (when the cylinder working medium is hydraulic oil) or the compressed air output pressure of the air filtering combination 26 (when the cylinder working medium is brake oil) is adjusted to set the pressure oil output pressure of the hydraulic pump station.
8) And operating a control panel on the electric cabinet 1, resetting the test times, restarting counting of the test stand, and formally starting the fatigue test.
9) When the pressure maintaining test is needed, parameters of the touch screen can be changed, the time for keeping the pressure oil output each time is prolonged (half an hour at the longest), and the pressure maintaining test is carried out.
10) And after the test is finished, pressing a stop button, recording test data, and comparing with the brake cylinder fatigue test standard to judge whether the product is qualified.
It should be apparent to those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and therefore, the modifications and changes that can be made by those skilled in the art to some parts of the present invention still embody the principles of the present invention, and the objects of the present invention are achieved, all falling within the scope of the present invention.
Claims (8)
1. The fatigue test device for the forklift brake cylinder is characterized by comprising a power mechanism for providing hydraulic pressure for the brake cylinder (7) and a test bed (10) for mounting the brake cylinder (7), wherein the hydraulic output end of the power mechanism is connected with the brake cylinder (7); the test bed (10) comprises a frame (11), a return mechanism for providing a load force and an adjusting assembly for adjusting the test stroke of the brake cylinder; a wheel cylinder mounting plate (12) is mounted on one side of a cavity of the frame (11), the brake wheel cylinder (7) is fixedly mounted on the inner side of the wheel cylinder mounting plate (12) and is located in the frame (11), through holes are symmetrically formed in two ends of the frame (11), and the through holes are communicated with the cavity of the frame (11); the brake cylinder is characterized in that cylinder piston rods (6) at two ends of the brake cylinder (7) are connected with return mechanisms with the same structure, guide rods (4) of the return mechanisms are hinged with the cylinder piston rods (6), a first guide sleeve (51) and a second guide sleeve (52) are sleeved on the guide rods (4) in a clearance fit manner, a return spring (8) is arranged between the first guide sleeve (51) and the second guide sleeve (52), the return spring (8) is sleeved on the guide rods (4), and the guide rods (4) are connected with guide plates (96) of the adjusting assembly; one end of the second guide sleeve (52) is clamped with the outer side port of the through hole of the frame (11), and the other end of the second guide sleeve extends to the outer side of the frame (11) and is connected with a limiting bolt of the adjusting assembly.
2. The fatigue testing device according to claim 1, wherein one end of the cylinder piston rod (6) is hinged with the cylinder piston ball, and the other end is hinged with the guide rod (4) through a pin shaft; one end of the first guide sleeve (51) is connected with the return spring (8), and the other end of the first guide sleeve is matched with a shaft shoulder of the guide rod (4); one end of the guide rod (4) far away from the brake cylinder (7) penetrates through the through hole of the frame (11) to extend to the outer side of the frame (11) to be connected with a guide plate (96) of the adjusting assembly.
3. The fatigue testing device according to claim 1 or 2, wherein the extension section of the second guide sleeve (52) is radially provided with a mounting groove, and the guide plate (96) is positioned in the mounting groove; the cover is equipped with third uide bushing (53) on first uide bushing (51), the hole and the first uide bushing (51) outer wall clearance fit of third uide bushing (53), and third uide bushing (53) are located the interior side port of frame (11) through-hole.
4. The fatigue testing device of claim 1, wherein the limiting bolt of the adjusting assembly comprises a first nut (94) and a first bolt (95) which are matched and arranged at the end part of the second guide sleeve (52), and a second nut (92) and a second bolt (91) which are arranged at the outer side of the top end of the guide plate (96); the guide plate (96) is fixedly arranged at the end part of the guide rod (4) through a second screw (97), a threaded hole is axially formed in the upper end of the guide plate (96), a first screw (93) is arranged in the threaded hole in a matched mode, the second bolt (91) is arranged in the second nut (92) in a threaded fit mode, and the second bolt (91) is perpendicular to the first screw (93); the first nut (94) is fixedly welded at the end part of the second guide sleeve (52), the first bolt (95) is in threaded fit with the first nut (94), and one end of the first bolt (95) penetrates through the first nut (94) and is positioned in the mounting groove of the second guide sleeve (52); a back nut (98) used for locking the first bolt (95) is sleeved on the first bolt (95).
5. The fatigue test device according to claim 1, wherein the power mechanism is a hydraulic oil hydraulic pump station (3), a hydraulic oil output end of the hydraulic oil hydraulic pump station (3) is connected with the brake cylinder (7) through an oil pipeline, and an oil path of the hydraulic oil hydraulic pump station (3) is connected with a hydraulic oil tank sequentially through a pressure oil control electromagnetic directional valve (31), an overflow valve (32) and an oil pump (33); the oil inlet end of overflow valve (32) is connected with first oil pressure table (34), the oil inlet end of oil pump (33) is connected with oil filter (35), works as power unit is hydraulic pressure oil hydraulic power unit (3) time, the hydraulic oil output of hydraulic pressure oil hydraulic power unit (3) is linked together through defeated oil pipe and the oil feed chamber of braking wheel cylinder (7).
6. The fatigue test device according to claim 1, wherein the power mechanism is a brake fluid hydraulic pump station (2), the brake fluid output end of the brake fluid hydraulic pump station (2) is connected with a brake branch pump (7) through an oil pipeline, and the pneumatic energy of the brake fluid hydraulic pump station (2) is connected with a workshop compressed air source through a forklift brake master cylinder (21), a cylinder (22) and a compressed air control electromagnetic directional valve (23) in sequence; the hydraulic input end of fork truck braking master cylinder (21) is connected with brake fluid liquid storage pot (24), and the hydraulic output end and the braking wheel cylinder (7) of fork truck braking master cylinder (21) are connected, the hydraulic output end of fork truck braking master cylinder (21) still is connected with second oil pressure table (25), the inlet end of workshop compressed air supply is connected with air filter combination (26), the power take off end of cylinder (22) is connected with the piston of fork truck braking master cylinder (21), works as power unit is when brake fluid hydraulic power unit (2), the brake fluid output end of fork truck braking master cylinder (21) is linked together through the oil feed chamber of defeated oil pipe with braking wheel cylinder (7).
7. The fatigue test device according to claim 6, wherein the electromagnetic directional valve of the brake fluid hydraulic pump station (2) and the electromagnetic directional valve of the hydraulic oil hydraulic pump station (3) are connected with the electric control box (1) for controlling the output pressure oil through wires.
8. The fatigue testing device according to claim 7, wherein the electric control box (1) is composed of a touch screen PLC integrated machine, a circuit breaker, a switch power supply, a relay and an indicator lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020251187.3U CN211401658U (en) | 2020-03-04 | 2020-03-04 | Fatigue test device for forklift brake cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020251187.3U CN211401658U (en) | 2020-03-04 | 2020-03-04 | Fatigue test device for forklift brake cylinder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211401658U true CN211401658U (en) | 2020-09-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020251187.3U Active CN211401658U (en) | 2020-03-04 | 2020-03-04 | Fatigue test device for forklift brake cylinder |
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| Country | Link |
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| CN (1) | CN211401658U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485023A (en) * | 2020-12-23 | 2021-03-12 | 芜湖稳乐制动系统有限公司 | Fatigue performance detection device for double-acting brake pump of automobile brake system |
| CN112611519A (en) * | 2020-12-23 | 2021-04-06 | 芜湖稳乐制动系统有限公司 | Power-assisted oil cylinder detection device of automobile braking system |
-
2020
- 2020-03-04 CN CN202020251187.3U patent/CN211401658U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485023A (en) * | 2020-12-23 | 2021-03-12 | 芜湖稳乐制动系统有限公司 | Fatigue performance detection device for double-acting brake pump of automobile brake system |
| CN112611519A (en) * | 2020-12-23 | 2021-04-06 | 芜湖稳乐制动系统有限公司 | Power-assisted oil cylinder detection device of automobile braking system |
| CN112485023B (en) * | 2020-12-23 | 2022-11-15 | 芜湖稳乐制动系统有限公司 | Fatigue performance detection device for double-acting brake pump of automobile brake system |
| CN112611519B (en) * | 2020-12-23 | 2024-04-02 | 芜湖稳乐制动系统有限公司 | Power-assisted cylinder detection device of automobile braking system |
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Effective date of registration: 20210625 Address after: No. 127, Baofu Road, Jintai District, Baoji City, Shaanxi Province Patentee after: Baoji Heli forklift Co.,Ltd. Address before: No. 127, Baofu Road, Baoji City, Shaanxi Province Patentee before: ANHUI HELI Co.,Ltd. BAOJI HELI FORKLIFT TRUCK PLANT |
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