CN112628242B - High-frequency pulse test device and test method for long-stroke hydraulic cylinder of crane - Google Patents
High-frequency pulse test device and test method for long-stroke hydraulic cylinder of crane Download PDFInfo
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- CN112628242B CN112628242B CN202110017917.2A CN202110017917A CN112628242B CN 112628242 B CN112628242 B CN 112628242B CN 202110017917 A CN202110017917 A CN 202110017917A CN 112628242 B CN112628242 B CN 112628242B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses a high-frequency pulse test device and a high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane. Guide rails are arranged on two side plates of the test bed, and a walking trolley is arranged on the guide rails; the walking trolley is provided with a walking driving component; a plurality of pin shaft sleeves arranged along the direction of the guide rail are arranged on two side plates of the test bed; a front end plug pin mechanism matched with the pin shaft sleeve is installed on the walking trolley, and a vertical tool pin shaft matched with a piston rod earring of the tested cylinder is installed at one end of the walking trolley in a dismounting mode; and middle bolt devices matched with the grooves of the cylinder barrel shaft seat of the tested cylinder are also arranged on two side plates of the test bench. The reliability of key points such as hydraulic cylinder sealing, welding seam quality and the like is tested, so that the reliability of the product is improved; the testing method and the testing device have strong universality, can install and fix long-stroke hydraulic cylinders with different cylinder diameters and different length series, can manually finely adjust and position and adopt mechanical locking, and have stable and reliable structure and strong universality.
Description
Technical Field
The invention relates to the technical field of hydraulic cylinder tests, in particular to a high-frequency pulse test device and a high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane.
Background
Big cylinder diameter of hoist telescopic cylinder class, long stroke pneumatic cylinder are great (generally the cylinder diameter is greater than or equal to 160mm in the middle of) because of the area of no rod chamber or having the pole chamber, and the stroke is longer (generally 7M-14M stroke), lead to: when the oil cylinder extends out completely, the volume of the rodless cavity of the tested cylinder is larger; when the oil cylinder is fully retracted, the volume of the rod cavity of the tested cylinder is larger. A conventional oil cylinder delivery test bed generally controls the tested cylinder to extend out of a full stroke to withstand voltage or perform a pulse test or retract into the full stroke to perform the withstand voltage or the pulse test.
The existing patent mainly has a 'fatigue test method and device for a hydraulic cylinder (CN 103939421A)' applied by Beijing university of industry, adopts a test method of separating a seal ring from a containing cavity to evaluate the reliability of the hydraulic cylinder, tests the containing cavity under rated fatigue pressure, fixes a piston rod and a hydraulic cylinder barrel of the hydraulic cylinder to ensure that the piston and the cylinder barrel do not move relatively, the fixing device is equivalent to the load of the hydraulic cylinder, when hydraulic oil is led to two sides of the hydraulic cylinder through a hydraulic system, the pressure on the left side and the right side of the piston changes alternately, realizes the simulation of the actual working condition of the hydraulic cylinder, and can be used for testing the fatigue strength of the hydraulic cylinder, verifying the reliability of the hydraulic cylinder and the like.
The defects of the technology are as follows:
the hydraulic cylinder is only suitable for small cylinders with small cylinder diameter and short stroke, but not suitable for large-cylinder-diameter and long-stroke cylinders. According to a closed cavity formula: Δ P = E Δ Q Δ T/V (note: a: Δ P: the pressure change of the closed volume at time interval Δ T; b, Δ Q: the difference between the inflow and outflow flow rates of the closed volume at time interval Δ T; V: the total volume of the closed volume; E: the effective bulk modulus of the volume) it can be seen that: for the large-cylinder-diameter and long-stroke hydraulic cylinder, if a rapid pulse test is required, the installed flow and the installed power of the test bed are huge, the cost of the test bed is extremely high, and common enterprises cannot bear the test bed.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-frequency pulse test device and a high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane.
The invention is realized by the following technical scheme: a high-frequency pulse test device for a long-stroke hydraulic cylinder of a crane comprises a test bench, guide rails are arranged on two side plates of the test bench, and a walking trolley is mounted on the guide rails; the walking trolley is provided with a walking driving assembly for driving the walking trolley to move along the guide rail; a plurality of pin shaft sleeves arranged along the direction of the guide rail are arranged on two side plates of the test bed; a front end plug pin mechanism matched with the pin shaft sleeve is installed on the walking trolley, and a vertical tool pin shaft matched with a piston rod earring of the tested cylinder is detachably installed at one end of the walking trolley; and middle bolt devices matched with the grooves of the cylinder barrel shaft seat of the tested cylinder are also arranged on two side plates of the test bench.
It further comprises the following steps: the test bench is of a cuboid box-shaped structure, and the guide rail comprises a pair of racks correspondingly arranged on two side plates of the test bench; the walking driving assembly comprises a hydraulic motor, and the hydraulic motor is connected with a test bed hydraulic system; the hydraulic motor spindle is connected with a gear, and the gear is meshed with the rack.
The pin shaft sleeves on the two side plates of the test bed are arranged oppositely one by one; the front end bolt mechanism comprises a duplex transverse pin shaft arranged on the walking trolley and a pneumatic motor driving device used for driving the duplex transverse pin shaft to stretch.
A pair of vertical bolt ear plates are fixed at one end of the walking trolley, and positioning holes matched with the vertical tool pin shafts are formed in the vertical bolt ear plates; a pressing plate cross beam is arranged above the vertical bolt ear plate and is opposite to the positioning hole of the vertical bolt ear plate up and down; and front plug pin cylinders are respectively fixed at two ends of the pressure plate cross beam and are fixed on the walking trolley.
And two ends of the pressure plate cross beam are respectively hinged with the telescopic ends of the corresponding front plug pin cylinders through small pin shafts.
The middle bolt devices on the two side plates of the test bed are oppositely arranged; the middle bolt device comprises a pin shaft tool guide sleeve fixed on a side plate of the test bed and a hand wheel screw rod rotatably arranged on the side plate of the test bed; a middle transverse tool pin shaft is arranged in the pin shaft tool guide sleeve in a matched manner, a guide groove is formed in the pin shaft tool guide sleeve, and a guide strip matched with the guide groove is arranged at the side part of the middle transverse tool pin shaft; the inner end of the hand wheel lead screw is connected with a middle transverse tool pin shaft.
A high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane comprises the following steps:
(1) placing the cylinder to be tested into a test bench, controlling the middle bolt device to extend out and be inserted into the cylinder shaft seat groove of the cylinder to be tested in a matched manner, and fixing the cylinder of the cylinder to be tested;
(2) the tested cylinder is connected with a test bed hydraulic system and drives the tested cylinder to retract to the bottom;
(3) the walking driving component controls the walking trolley to be close to a piston rod earring of the tested cylinder; the front end bolt mechanism is controlled to extend out and be inserted into the bolt shaft sleeves on the two side plates of the test bed in a matched mode, and the walking trolley is fixed;
(4) a piston rod lug of the tested cylinder is fixed at one end of the walking trolley through a vertical tooling pin shaft;
(5) and starting a power source of the test bed to perform a rodless cavity high-frequency pulse test.
A high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane comprises the following steps:
(1) placing the cylinder to be tested into a test bench, controlling the middle bolt device to extend out and be inserted into the cylinder shaft seat groove of the cylinder to be tested in a matched manner, and fixing the cylinder of the cylinder to be tested;
(2) the tested cylinder is connected with a test bed hydraulic system and drives the tested cylinder to extend out of the test bed hydraulic system;
(3) the walking driving component controls the walking trolley to approach the piston rod earrings of the tested cylinder; the front end bolt mechanism is controlled to extend out and be inserted into the bolt shaft sleeves on the two side plates of the test bed in a matched mode, and the walking trolley is fixed;
(4) a piston rod lug of the tested cylinder is fixed at one end of the walking trolley through a vertical tooling pin shaft;
(5) and starting a power source of the test bed to perform a high-frequency pulse test of the rod cavity.
Compared with the prior art, the invention has the beneficial effects that: the rapid high-frequency pulse test of the large-cylinder-diameter long-stroke hydraulic cylinder of the telescopic oil cylinder of the hoisting crane is carried out, the reliability of key points such as the sealing of the hydraulic cylinder, the quality of a welding seam and the like is tested, and the reliability of a product is improved; the testing method and the testing device have strong universality, can install and fix long-stroke hydraulic cylinders with different cylinder diameters and different length series, realize variable stroke, manual fine adjustment and positioning of the tested cylinder by adopting the mechanism travelling device and adopt mechanical locking, and have stable and reliable structure and strong universality.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
FIG. 2 is an enlarged view of the walking cart of FIG. 1;
FIG. 3 is a schematic view of a vertical tooling pin structure;
FIG. 4 is an enlarged view of FIG. 1 at the intermediate latch mechanism;
FIG. 5 is a schematic view of the structure of a cylinder to be tested;
in the figure: 1. a traveling trolley; 2. a rack; 3. a pin bush; 4. a middle latch device; 5. a test bed; 6. a travel drive assembly; 7. a front end latch mechanism; 8. a duplex transverse pin shaft; 9. a platen beam; 10. a vertical plug pin ear plate; 11. a front plug pin cylinder; 12. a small pin shaft; 13. a vertical tooling pin shaft; 14. a hand wheel lead screw ejector rod mechanism; 15. a pin shaft tool guide sleeve; 16. middle horizontal frock round pin axle.
Detailed Description
The following are specific embodiments of the present invention, and the present invention will be further described with reference to the accompanying drawings.
Example one
Referring to fig. 1 to 5, a high-frequency pulse test device for a long-stroke hydraulic cylinder of a crane,
the test bench 5 is of a cuboid box-shaped structure, guide rails are arranged on two side plates of the test bench 5, and each guide rail comprises a pair of racks 2 which are correspondingly arranged on the two side plates of the test bench 5. A walking driving component 6 is arranged on the walking trolley 1, the walking driving component 6 comprises a hydraulic motor, and the hydraulic motor is connected with a test bed hydraulic system; the main shaft of the hydraulic motor is connected with a gear which is meshed with the rack 2. The test bed hydraulic system controls the hydraulic motor to rotate forward and backward, and then the gear mechanism connected to the main shaft of the hydraulic motor is meshed with the rack 2, so that the walking trolley 1 is driven to walk forwards and backwards.
The two side plates of the test bed 5 are provided with a plurality of pin shaft sleeves 3 arranged along the direction of the guide rail, and the pin shaft sleeves 3 on the two side plates of the test bed 5 are arranged oppositely one by one. The walking trolley 1 is provided with a front end bolt mechanism 7, and the front end bolt mechanism 7 is matched with the pin shaft sleeve 3 and used for positioning the walking trolley 1 and the test bed 5. The front end bolt mechanism 7 comprises a duplex transverse pin shaft 8 arranged on the walking trolley 1 and a pneumatic motor driving device used for driving the duplex transverse pin shaft 8 to stretch. When the walking trolley 1 walks along the length direction of the sequence test bench 5, the duplex transverse pin shaft 8 is driven by the pneumatic motor driving device to perform plugging or pin pulling operation towards the pin shaft sleeves 3 at different positions in the length direction of the test bench 5. When the driving duplex transverse pin shaft 8 is inserted into two outer side pins, the walking trolley 1 and the test bed 5 can be fixed; when the driving duplex transverse pin shaft 8 is retracted inwards to pull the pin, the walking trolley 1 can be separated from the test bed 5, and the walking trolley can freely walk.
A pair of vertical bolt ear plates 10 are fixed at one end of the walking trolley 1, positioning holes matched with a vertical tool pin shaft 13 are formed in the vertical bolt ear plates 10, and the vertical tool pin shaft 13 is used for positioning a piston rod ear ring of a tested cylinder on the vertical bolt ear plates 10. And a pressing plate cross beam 9 is arranged above the vertical bolt ear plate 10, and the pressing plate cross beam 9 is vertically opposite to the positioning hole of the vertical bolt ear plate 10. Two ends of the pressure plate cross beam 9 are respectively hinged on front plug pin cylinders 11 on two sides through small pin shafts 12, and the front plug pin cylinders 11 are fixed on the walking trolley 1. After the small pin shaft 12 on one side is pulled out manually, the pressing plate cross beam 9 can rotate 90 degrees around the small pin shaft 12 on the other side as an axis, and the installation space of the vertical tool pin shaft 13 is left. When a large-cylinder-diameter long-stroke hydraulic cylinder is used for pulse tests, the earrings (connected to the piston rod) of the tested cylinder are required to be fixed and connected with 10 vertical bolt earplates through vertical tooling pin shafts 13, and then the walking trolley 1 is fixed and connected.
Two side plates of the test bench 5 are provided with middle bolt devices 4 matched with the grooves of the cylinder shaft seat of the tested cylinder, and the middle bolt devices 4 on the two side plates are oppositely arranged. The middle bolt device 4 comprises a pin shaft tool guide sleeve 15 fixed on a side plate of the test bench 5 and a hand wheel screw 14 rotatably installed on the side plate of the test bench 5; a middle transverse tool pin 16 is installed in the pin tool guide sleeve 15 in a matched manner, a guide groove is formed in the pin tool guide sleeve 15, and a guide strip matched with the guide groove is arranged on the side part of the middle transverse tool pin 16; the inner end of the hand wheel lead screw 14 is connected with a middle transverse tool pin 16. The hand wheel screw 14 can be manually rotated forward and backward to control the screw ejector rod to push the middle transverse tool pin shafts 16 at two sides to extend towards the center of the test bench 5, and the middle transverse tool pin shafts are propped in the shaft seat grooves of the telescopic oil cylinder barrels of the tested crane to fix the cylinder barrels of the tested cylinder. In addition, middle horizontal frock round pin axle 16 is placed at round pin axle frock uide bushing 15 hole, and round pin axle frock uide bushing 15 mainly plays the guide effect, guarantees the exactness of middle horizontal frock round pin axle 16 extension and withdrawal direction.
Example two
A high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane adopts the high-frequency pulse test device for the long-stroke hydraulic cylinder of the crane in the embodiment I,
the rodless cavity high-frequency pulse test comprises the following steps:
(1) the tested cylinder is placed into a test bench 5, the middle bolt device 4 is controlled to extend out to be inserted into a cylinder barrel shaft seat groove of the tested cylinder in a matched mode, and the cylinder barrel of the tested cylinder is fixed;
(2) the tested cylinder is connected with a test bed hydraulic system and drives the tested cylinder to retract to the bottom;
(3) the walking driving component 6 controls the walking trolley 1 to approach the piston rod earrings of the tested cylinder; a duplex transverse pin shaft 8 in the front-end pin mechanism 7 is controlled to extend out and be inserted into the pin shaft sleeves 3 on the two side plates of the test bed 5 in a matched mode, and the walking trolley 1 is fixed; in the process, the position of the walking trolley 1 can be controlled by a manual remote controller matched with the test bed to carry out manual fine adjustment and alignment;
(4) a piston rod lug ring of the tested cylinder is fixed at one end of the walking trolley 1 through a vertical tool pin shaft 13, and at the moment, the rodless cavity of the tested cylinder is ensured to be as small as possible;
(5) and starting a power source of the test bed to perform a rodless cavity high-frequency pulse test.
When the rodless cavity pulse test of the tested cylinder is carried out, the cylinder barrel must be fixed firstly, then the tested cylinder retracts to be close to complete retraction to the bottom as much as possible, and then a piston rod of the tested cylinder is fixed through a machine test bench mechanism, so that the minimum volume of the cavity of the rodless cavity is ensured. On the basis, the flow (300-400L/Min) and the installed power (200 KW-400 KW) of a conventional test bed are realized, the rapid pulse test is realized, and the pulse frequency is improved.
The high-frequency pulse test of the rod cavity comprises the following steps:
(1) placing the cylinder to be tested into a test bench 5, controlling the middle bolt device 4 to extend out and be inserted into a cylinder barrel shaft seat groove of the cylinder to be tested in a matched manner, and fixing the cylinder barrel of the cylinder to be tested;
(2) the tested cylinder is connected with a test bed hydraulic system and drives the tested cylinder to extend out of the test bed hydraulic system;
(3) the walking driving component 6 controls the walking trolley 1 to approach the piston rod earrings of the tested cylinder; a duplex transverse pin shaft 8 in the front end plug pin mechanism 7 is controlled to extend out and be inserted into the pin shaft sleeves 3 on the two side plates of the test bed 5 in a matching manner, and the walking trolley 1 is fixed; in the process, the position of the walking trolley 1 can be controlled by a manual remote controller matched with the test bed to carry out manual fine adjustment and alignment;
(4) a piston rod lug ring of the tested cylinder is fixed at one end of the walking trolley 1 through a vertical tooling pin shaft 13, so that the cavity of the rod cavity of the tested cylinder is ensured to be as small as possible;
(5) and starting a power source of the test bed to perform a high-frequency pulse test of the rod cavity.
When the tested cylinder is subjected to the rod cavity pulse test, the cylinder barrel must be fixed firstly, then the tested cylinder extends out as close as possible to completely extend out to the head, and then a piston rod of the tested cylinder is fixed through a machine test bench mechanism, so that the minimum volume of a cavity with a rod cavity is ensured. On the basis, the flow (300-400L/Min) and the installed power (200 KW-400 KW) of a conventional test bed are realized, the rapid pulse test is realized, and the pulse frequency is improved.
This embodiment can effectual promotion hoist telescopic cylinder class (product structure is one end earring, one end is cylinder middle part area axle bed fixed knot structure) big cylinder diameter, long stroke pneumatic cylinder's quick high frequency pulse test, tests to the reliability of key point such as pneumatic cylinder seal, welding seam quality, has promoted the reliability of product. The testing method and the testing device have strong universality, can install and fix long-stroke hydraulic cylinders with different cylinder diameters and different length series, realize variable stroke, manual fine adjustment and positioning of the tested cylinder by adopting the mechanism travelling device and adopt mechanical locking, and have stable and reliable structure and strong universality.
Claims (7)
1. A high-frequency pulse test device for a long-stroke hydraulic cylinder of a crane,
the method is characterized in that:
the test bed comprises a test bed frame (5), guide rails are arranged on two side plates of the test bed frame (5), and a walking trolley (1) is arranged on the guide rails; the walking trolley (1) is provided with a walking driving component (6) for driving the walking trolley (1) to move along the guide rail;
a plurality of pin shaft sleeves (3) arranged along the direction of the guide rail are arranged on two side plates of the test bed (5); a front end plug pin mechanism (7) matched with the pin shaft sleeve (3) is installed on the walking trolley (1), and a vertical tooling pin shaft (13) matched with a piston rod earring of the tested cylinder is detachably installed at one end of the walking trolley (1);
two side plates of the test bench (5) are also provided with middle bolt devices (4) matched with the grooves of the cylinder shaft seat of the tested cylinder;
the test bed (5) is of a cuboid box-shaped structure, and the guide rail comprises a pair of racks (2) correspondingly arranged on two side plates of the test bed (5); the walking driving assembly (6) comprises a hydraulic motor, and the hydraulic motor is connected with a test bed hydraulic system; the hydraulic motor spindle is connected with a gear, and the gear is meshed with the rack (2).
2. The high-frequency pulse test device for the long-stroke hydraulic cylinder of the crane according to claim 1, characterized in that: the pin shaft sleeves (3) on the two side plates of the test bed (5) are arranged oppositely one by one; the front end bolt mechanism (7) comprises a duplex transverse pin shaft (8) arranged on the walking trolley (1) and a pneumatic motor driving device used for driving the duplex transverse pin shaft (8) to stretch.
3. The high-frequency pulse test device for the long-stroke hydraulic cylinder of the crane according to claim 1, characterized in that: a pair of vertical plug pin ear plates (10) is fixed at one end of the walking trolley (1), and positioning holes matched with the vertical tool pin shafts (13) are formed in the vertical plug pin ear plates (10); a pressing plate cross beam (9) is arranged above the vertical bolt ear plate (10), and the pressing plate cross beam (9) is vertically opposite to a positioning hole of the vertical bolt ear plate (10); and front plug pin cylinders (11) are respectively fixed at two ends of the pressure plate cross beam (9), and the front plug pin cylinders (11) are fixed on the walking trolley (1).
4. The high-frequency pulse test device for the long-stroke hydraulic cylinder of the crane according to claim 3, wherein: and two ends of the pressure plate cross beam (9) are respectively hinged with the telescopic ends of the corresponding front plug pin cylinders (11) through small pin shafts (12).
5. The high-frequency pulse test device for the long-stroke hydraulic cylinder of the crane according to claim 1, characterized in that: the middle bolt devices (4) on the two side plates of the test bed (5) are oppositely arranged; the middle bolt device (4) comprises a pin shaft tool guide sleeve (15) fixed on a side plate of the test bench (5) and a hand wheel screw (14) rotatably installed on the side plate of the test bench (5); a middle transverse tool pin (16) is installed in the pin tool guide sleeve (15) in a matched manner, a guide groove is formed in the pin tool guide sleeve (15), and a guide strip matched with the guide groove is arranged on the side part of the middle transverse tool pin (16); the inner end of the hand wheel lead screw (14) is connected with a middle transverse tool pin shaft (16).
6. A high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane, which adopts the high-frequency pulse test device for the long-stroke hydraulic cylinder of the crane of any one of claims 1 to 5, is characterized in that,
the rodless cavity high-frequency pulse test comprises the following steps:
(1) the tested cylinder is placed into a test bench (5), the middle bolt device (4) is controlled to extend out and be inserted into a cylinder barrel shaft seat groove of the tested cylinder in a matched mode, and a cylinder barrel of the tested cylinder is fixed;
(2) the tested cylinder is connected with a test bed hydraulic system and is driven to retract to the bottom;
(3) the walking driving component (6) is used for controlling the walking trolley (1) to be close to a piston rod earring of the tested cylinder; the front end plug pin mechanism (7) is controlled to extend out and be inserted into the pin shaft sleeves (3) on the two side plates of the test bed (5) in a matching manner, and the walking trolley (1) is fixed;
(4) a piston rod earring of the tested cylinder is fixed at one end of a walking trolley (1) through a vertical tooling pin shaft (13);
(5) and starting a power source of the test bed to perform a rodless cavity high-frequency pulse test.
7. A high-frequency pulse test method for a long-stroke hydraulic cylinder of a crane, which adopts the high-frequency pulse test device for the long-stroke hydraulic cylinder of the crane of any one of claims 1 to 5, is characterized in that,
the high-frequency pulse test of the rod cavity comprises the following steps:
(1) the tested cylinder is placed into a test bench (5), the middle bolt device (4) is controlled to extend out and be inserted into a cylinder barrel shaft seat groove of the tested cylinder in a matched mode, and the cylinder barrel of the tested cylinder is fixed;
(2) the tested cylinder is connected with a test bed hydraulic system and drives the tested cylinder to extend out of the test bed hydraulic system;
(3) the walking driving component (6) is used for controlling the walking trolley (1) to be close to a piston rod earring of the tested cylinder; the front end plug pin mechanism (7) is controlled to extend out and be inserted into the pin shaft sleeves (3) on the two side plates of the test bed (5) in a matching manner, and the walking trolley (1) is fixed;
(4) a piston rod earring of the tested cylinder is fixed at one end of the walking trolley (1) through a vertical tool pin shaft (13);
(5) and starting a power source of the test bed to perform a high-frequency pulse test of the rod cavity.
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| CN202110017917.2A CN112628242B (en) | 2021-01-07 | 2021-01-07 | High-frequency pulse test device and test method for long-stroke hydraulic cylinder of crane |
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| DE3830049C1 (en) * | 1988-09-03 | 1989-11-16 | Daimler-Benz Aktiengesellschaft, 7000 Stuttgart, De | Flat track unit for motor vehicle test stands |
| CN203081904U (en) * | 2012-12-19 | 2013-07-24 | 天津工程机械研究院 | Hydraulic cylinder testing bed |
| CN204113809U (en) * | 2014-09-09 | 2015-01-21 | 徐州徐工液压件有限公司 | A kind of Full-automatic cylinder barrel impulse test device |
| CN104697779B (en) * | 2015-03-23 | 2016-06-15 | 煤炭科学技术研究院有限公司 | A kind of comprehensive mining hydraulic bracket column testing table |
| CN210461261U (en) * | 2019-05-17 | 2020-05-05 | 浙江理工大学 | Detachable is to top jar test bench pneumatic cylinder connecting device |
| CN110207979B (en) * | 2019-06-21 | 2020-12-22 | 中国煤炭科工集团太原研究院有限公司 | Comprehensive performance test bed for walking mechanism of mining equipment |
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