CN204730969U - A kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system - Google Patents
A kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system Download PDFInfo
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- CN204730969U CN204730969U CN201520337898.1U CN201520337898U CN204730969U CN 204730969 U CN204730969 U CN 204730969U CN 201520337898 U CN201520337898 U CN 201520337898U CN 204730969 U CN204730969 U CN 204730969U
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- broach shell
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Abstract
A kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system, belong to numerically-controlled machine functional part Performance Detection field.This system is made up of physical construction module, control module, gas path module, data acquisition and procession module.This system dismounting can need the broach shell of detection easily, regulate the axial distance between handle of a knife, broach shell, controlled between broach shell, handle of a knife, to realize automatic slotting tool, action of drawing sword by small PLC, carry out data interaction by data collecting card recording detection data with industrial computer.This detection system not only can detect slotting tool power and power of drawing sword in real time when handle of a knife and broach shell plug cutter action, the data also contrasting same broach shell by front and back obtain its duty, and this detection system can carry out plugging cutter action continuously and detecting the fatigue effect obtaining broach shell for a long time.For professional production factory provides the scheme detecting broach shell slotting tool power, power of drawing sword and duty, for tool magazine slotting tool does not enter, falls the faults such as cutter and provide mechanics basis.
Description
Technical field
The utility model is a kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system, belongs to numerically-controlled machine functional part Performance Detection field.
Background technology
Tool magazine is the critical function parts of numerical control machining center, for depositing all kinds of process tool, mainly comprise disc type tool magazine, magazine, bamboo hat type tool holder, umbrella-type tool magazine etc., the broach shell that the utility model relates to is for disc type tool magazine and magazine, its reliability level directly affects the reliability level of tool magazine, and then affects the reliability level of complete machine tool.Usual tool magazine is when dispatching from the factory, and the locking spring in broach shell is all adjust with knowhow, as locking spring to handle of a knife slotting tool, draw sword action time the maximum resistance that applies, namely the measurement of slotting tool power and power of drawing sword lacks detection system easily and effectively.In addition, tool magazine is when long-time running, and the lock-screw in broach shell there will be loosening, and locking spring there will be fatigue phenomenon, causes slotting tool power, power of drawing sword is abnormal, so that occur falling the system failures such as cutter.Therefore, need to study a kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system, convenient and swiftly can detect the slotting tool power of broach shell, power of drawing sword and duty intuitively, to adjust in time or to change the locking spring in broach shell, thus improve the reliability level of tool magazine and machining center.
At present, high and the complex structure of external similar detection system cost, and the detection of domestic Jin You Jilin University to machining center ATC system slotting tool power and power of drawing sword had research, but no matter physical construction, System's composition and method of testing are all not identical, and testing process is extremely not convenient, directly perceived, its patent description is as follows.Chinese patent publication No. is CN104175179A, date of publication is 2014-12-03, denomination of invention is " machining center ATC system draw sword the detection system of power and slotting tool power and method ", in this patent, handle of a knife is done Transform Type design, the storage card of force cell and image data is all placed in remodeling handle of a knife, obtain slotting tool power, need during power of drawing sword first to stop testing the storage card taken out in remodeling handle of a knife, read storing card data by computing machine again to obtain through a series of analysis, very inconvenient, intuitively, and if broach shell internal locking spring need be adjusted, then need constantly to repeat aforementioned process, very loaded down with trivial details, have a strong impact on detection efficiency.
Summary of the invention
Deficient in order to solve Present Domestic tool magazine broach shell slotting tool power, power of drawing sword and duty detection system, and only detection system testing process is convenient not and directly perceived, solve high, the baroque problem of external this kind of detection system cost, the utility model provides a kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system simultaneously.The technical scheme taked is as described below:
Described tool magazine broach shell slotting tool power, power of drawing sword and duty detection system are made up of physical construction module, control module, gas path module, data acquisition and procession module; Described physical construction module comprises base, sliding support plate, lead rail axis, air cylinder support, handle of a knife guide frame, sensor mount, the first web member, the second web member, linear bearing, the handle of a knife axis of guide, chuck pressure cap, collet chuck, handle of a knife, broach shell, broach shell holder.Described control module comprises PLC, relay, 3 position-5 way solenoid directional control valve, the first magnetic switch, the second magnetic switch.
Described gas path module comprises air compressor, source of the gas process three linked piece, 3 position-5 way solenoid directional control valve, one-way throttle valve, cylinder.Described data acquisition and processing (DAP) module comprises pull pressure sensor, signal conditioner, data collecting card, industrial computer, the 3rd magnetic switch.
According to the tool magazine broach shell slotting tool power described in technical scheme, power of drawing sword and duty detection system, it is characterized in that: described physical construction module take base as benchmark, base is installed air cylinder support, pair of guide rails axle, handle of a knife guide frame and sensor mount, and cylinder is arranged on air cylinder support.Sliding support plate is passed by pair of guide rails axle after loading linear bearing, and cylinder projecting shaft and the nut lock of sliding support plate right-hand member through hole are connected, and sliding support plate are provided with broach shell holder and broach shell.The handle of a knife axis of guide is clamped by the combination of collet chuck and chuck pressure cap by handle of a knife, and the handle of a knife axis of guide is through the linear bearing on handle of a knife guide frame.Be threaded connection, successively the handle of a knife axis of guide, the first web member, pull pressure sensor, the second web member be connected from left to right, finally the second web member is also passed through a pair nut lock on sensor mount through sensor mount.
According to the tool magazine broach shell slotting tool power described in technical scheme, power of drawing sword and duty detection system, it is characterized in that: be connected by cylinder projecting shaft and sliding support plate, it can promote sliding support plate along the smooth and easy slip of lead rail axis, thus complete slotting tool with handle of a knife, action of drawing sword.
According to the tool magazine broach shell slotting tool power described in technical scheme, power of drawing sword and duty detection system, it is characterized in that: the axial distance of handle of a knife and broach shell can be regulated by the overhang of the second web member through sensor mount, handle of a knife is adjusted to and can normally complete slotting tool, by a pair nut, the second web member be locked on sensor mount behind the position of action of drawing sword.
According to the tool magazine broach shell slotting tool power described in technical scheme, power of drawing sword and duty detection system, it is characterized in that: in described control module, PLC output terminal is connected with the control end of two relays, two relay output ends are connected with the electromagnet at 3 position-5 way solenoid directional control valve two ends respectively, place the first magnetic switch and the second magnetic switch respectively at the two ends of cylinder column, two magnetic switchs are connected with PLC input end respectively simultaneously.
According to the tool magazine broach shell slotting tool power described in technical scheme, power of drawing sword and duty detection system, it is characterized in that: in described gas path module, air compressor gas outlet is connected with the air intake opening of source of the gas process three linked piece, the gas outlet of source of the gas process three linked piece is connected with the air intake opening of 3 position-5 way solenoid directional control valve, two gas outlets of 3 position-5 way solenoid directional control valve are connected with the air intake opening of one-way throttle valve respectively, and the gas outlet of one-way throttle valve is connected with the air intake opening of cylinder respectively.
According to the tool magazine broach shell slotting tool power described in technical scheme, power of drawing sword and duty detection system, it is characterized in that: in described data acquisition and processing (DAP) module, pull pressure sensor output terminal is connected with signal conditioner input end, signal conditioner output terminal is all connected with data collecting card input channel with the 3rd magnetic switch, data collecting card is inserted in the PCI slot of industrial computer, and wherein the 3rd magnetic switch is placed on cylinder column.
Compared with prior art the beneficial effects of the utility model are:
1, the utility model is the detection system that tool magazine factory provides a kind of broach shell slotting tool power, power of drawing sword, and is beneficial to factory and controls to dispatch from the factory the quality of broach shell.
2, the utility model can in the different operating moment of tool magazine, slotting tool power is carried out to same broach shell, power of drawing sword detect, obtain its duty, facilitate tool setting to pack into Row sum-equal matrix or replacing, make broach shell maintain a normal duty, improve the reliability level of tool magazine.
3, the utility model can carry out slotting tool, action simulation of drawing sword continuously, and obtain broach shell slotting tool power, power of drawing sword with the variation relation plugging cutter number of times, i.e. the fatigue effect of broach shell, for tool magazine factory provides some data.
4, structure of the present utility model, operation are all very simple, slotting tool, draw sword action time can draw the curve of institute's Aerodynamic data in real time, and slotting tool, action of drawing sword obtain slotting tool power and power of drawing sword immediately after completing, very intuitively, improve detection efficiency.
5, in physical construction of the present utility model, broach shell only realizes location by two register pins and installs, and facilitates the dismounting of broach shell, installation and replacing.When particularly needing adjustment broach shell internal locking spring, repeatedly to broach shell dismounting, adjustment, installation, detection, the facility that structure is brought is more obvious.
Accompanying drawing explanation
Fig. 1 physical construction wiring layout
The partial enlarged drawing at broach shell place, left side in Fig. 1-1 Fig. 1
The partial enlarged drawing at right sensor place in Fig. 1-2 Fig. 1
The explosive view of Fig. 2 physical construction
The isometric view 1 of Fig. 3-1 physical construction wiring layout
The isometric view 2 of Fig. 3-2 physical construction wiring layout
Fig. 4 detection system structure composition diagram
Fig. 5 control module composition frame chart
Fig. 6 Pneumatic module composition frame chart
Fig. 7 data acquisition and procession module composition frame chart
In figure, 1---cylinder, 2---base, 3---sliding support plate, 4---lead rail axis, 5---air cylinder support, 6---handle of a knife guide frame, 7---sensor mount, 8---the first web member, 9---pull pressure sensor, 10---the second web member, 11---linear bearing, 12---the handle of a knife axis of guide, 13---chuck pressure cap, 14---collet chuck, 15---handle of a knife, 16---broach shell, 17---broach shell holder, 18---the 3rd magnetic switch, 19---left register pin, 20---right register pin, 21---the first magnetic switch, 22---the second magnetic switch, 23---air compressor, 24---source of the gas process three linked piece, 25---3 position-5 way solenoid directional control valve, 26---one-way throttle valve, 27---relay, 28---PLC, 29---signal conditioner, 30---data collecting card, 31---industrial computer.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described further:
Fig. 4 is detection system structure composition diagram, and this detection system is made up of physical construction module, control module, gas path module, data acquisition and procession module; Described physical construction module comprises base (2), sliding support plate (3), lead rail axis (4), air cylinder support (5), handle of a knife guide frame (6), sensor mount (7), the first web member (8), the second web member (10), linear bearing (11), the handle of a knife axis of guide (12), chuck pressure cap (13), collet chuck (14), handle of a knife (15), broach shell (16), broach shell holder (17).Described control module comprises PLC (28), relay (27), 3 position-5 way solenoid directional control valve (25), the first magnetic switch (21), the second magnetic switch (22).Described gas path module comprises air compressor (23), source of the gas process three linked piece (24), 3 position-5 way solenoid directional control valve (25), one-way throttle valve (26), cylinder (1).Described data acquisition and processing (DAP) module comprises pull pressure sensor (9), signal conditioner (29), data collecting card (30), industrial computer (31), the 3rd magnetic switch (18).
Fig. 1 is physical construction wiring layout, and Fig. 2 is the explosive view of physical construction, the isometric view 2 of Fig. 3-1 to be the isometric view 1, Fig. 3-2 of physical construction wiring layout be physical construction wiring layout.Physical construction module with base (2) for benchmark, in base (2) central slot, air cylinder support (5) is installed, is located by middle two register pins and use four bolts air cylinder support (5) and base (2) to be connected.The front end face of cylinder (1) and air cylinder support (5) pass on left four bolts and are connected, and the cylinder boss of cylinder (1) external part and the through hole of air cylinder support (5) are clearance fit.In the left side of base (2) right-hand member groove, handle of a knife guide frame (6) is installed, is located by the positioning key at middle part and use two bolts handle of a knife guide frame (6) and base (2) to be connected.On right side sensor installation erecting frame (7) of base (2) right-hand member groove, by two bolts, sensor mount (7) and base (2) are connected.Before and after sliding support plate (3) lower end, respectively there are two large through-holes both sides, be symmetric, respectively by each linear bearing (11) through each through hole, bearing outer wall and through-hole wall are transition fit, circlip for shaft is installed by linear bearing (11) constraint in through-holes by the groove before and after linear bearing (11), simultaneously by two lead rail axis (4) through two pairs of linear bearings (11), sliding support plate (3) can along lead rail axis (4) smooth and easy slip.A lead rail axis (4) is respectively installed in base (2) rear and front end, is located and use two bolts each lead rail axis (4) and base (2) to be connected by the register pin at two ends, left and right.Cylinder (1) projecting shaft and sliding support plate (3) through the small through hole on the right side of slidably supported plate lower end, and with former and later two nut locks two end faces about through hole, are connected by cylinder (1) projecting shaft.Broach shell holder (17) is positioned at sliding support plate (3) by positioning key go up and use four bolts broach shell holder (17) and sliding support plate (3) to be connected.Broach shell (16) is arranged on broach shell holder (17), locate by left register pin (19) and right register pin (20) and install, wherein left register pin (19) and through hole are clearance fit, having gap between right register pin (20) and through hole, can there is small deflection around left register pin (19) in broach shell (16).Collet chuck (14) the right conical surface and chuck pressure cap (13) inside surface are fitted and loads, make the two right side concordant, and chuck pressure cap (13) is threaded with handle of a knife (15) right-hand member.Little for the handle of a knife axis of guide (12) left end multidiameter is inserted in collet chuck (14) right-hand member circular hole, and by screwing being threaded between chuck pressure cap (13) with handle of a knife (15) multidiameter is locked.First web member (8) left end is threaded with the handle of a knife axis of guide (12) right-hand member, pull pressure sensor (9) left end is threaded with the first web member (8) right-hand member, the second web member (10) left end is threaded with pull pressure sensor (9) right-hand member.Make linear bearing (11) through handle of a knife guide frame (6) through hole, and the groove before and after linear bearing (11) install circlip for shaft by linear bearing (11) constraint in through-holes.By the handle of a knife axis of guide (12) through linear bearing (11), make the handle of a knife axis of guide (12) can linearly bearing (11) smooth and easy slip.By the through hole of the right-hand member major axis of the second web member (10) through sensor mount (7), major axis and through hole have gap, and with former and later two nut locks on the end face of two, the left and right of sensor mount (7), the second web member (10) and sensor mount (7) are connected.
Fig. 5 is control module composition frame chart.In control module, PLC (28) output terminal is connected with the control end of two relays (27), two relay (27) output terminals are connected with the electromagnet at 3 position-5 way solenoid directional control valve (25) two ends respectively, place the first magnetic switch (21) and the second magnetic switch (22) respectively at the two ends of cylinder (1) pillar, two magnetic switchs are connected with PLC (28) input end respectively simultaneously.
Fig. 6 is Pneumatic module composition frame chart.In gas path module, air compressor (23) gas outlet is connected with the air intake opening of source of the gas process three linked piece (24), the gas outlet of source of the gas process three linked piece (24) is connected with the air intake opening of 3 position-5 way solenoid directional control valve (25), two gas outlets of 3 position-5 way solenoid directional control valve (25) are connected with the air intake opening of one-way throttle valve (26) respectively, and the gas outlet of one-way throttle valve (26) is connected with the air intake opening of cylinder (1) respectively.
Fig. 7 is data acquisition and procession module composition frame chart.In data acquisition and processing (DAP) module, pull pressure sensor (9) output terminal is connected with signal conditioner (29) input end serial ports, signal conditioner (29) output terminal is all connected with data collecting card (30) input channel with the 3rd magnetic switch (18), data collecting card (30) is inserted in the PCI slot of industrial computer (31), and wherein the 3rd magnetic switch (18) is placed in the position near the first magnetic switch (21) between the first magnetic switch (21) and the second magnetic switch (22) on cylinder (1) pillar.
Build detection system according to the method described above, in physical construction now, handle of a knife (15) and sensor are all connected in base (2) right side, and broach shell (16) can move forward and backward along lead rail axis (4) under the effect of cylinder (1) projecting shaft.PLC (28) control cylinder (1) realizes forward, oppositely alternately air inlet automatically, thus realizes broach shell (16) and the slotting tool of handle of a knife (15), action of drawing sword.
The force data that pull pressure sensor (9) gathers finally is transferred to industrial computer (31) by signal conditioner (29), data collecting card (30).By the different operating moment at tool magazine, carry out as above slotting tool power, power of drawing sword for same broach shell (16) to detect, fore-and-aft survey result can be compared, determine the locking degree of broach shell (16) internal locking spring, to adjust in time, detect again after adjustment, until slotting tool power and the power of drawing sword are maintained in certain tolerance band, thus make locking spring maintain a normal duty.
Utilize this detection system, the concrete operation step of detection is as follows:
1, build detection system, physical construction module, control module, gas path module and data acquisition and processing (DAP) module are connected in order.
2, control cylinder (1) can realize forward, oppositely alternately air inlet automatically.
3, run PLC (28), observe slotting tool-action of drawing sword, by handle of a knife (15) along axis trimming to the position that normally can complete slotting tool-action of drawing sword.
4, automatic triggering collection when slotting tool action starts, after action of drawing sword completes, automatic triggering stops gathering, and in slotting tool-course of action of drawing sword real-time rendering stress curve, and automatic analysis obtains slotting tool power and power of drawing sword after action completes.
5, take off again after broach shell (16) being put back to tool magazine work a period of time, load this detection system and detect, testing result and result are before this compared, this broach shell can be obtained
(16) duty that internal locking spring is current.
In addition, also directly can carry out slotting tool-action 20000 times of drawing sword continuously in this detection platform, observe broach shell (16) slotting tool power, power of drawing sword with the change of action frequency, obtain the fatigue effect of broach shell (16).
Claims (4)
1. tool magazine broach shell slotting tool power, power of drawing sword and a duty detection system, this system is made up of physical construction module, control module, gas path module, data acquisition and procession module; It is characterized in that: described physical construction module comprises base (2), sliding support plate (3), lead rail axis (4), air cylinder support (5), handle of a knife guide frame (6), sensor mount (7), the first web member (8), the second web member (10), linear bearing (11), the handle of a knife axis of guide (12), chuck pressure cap (13), collet chuck (14), handle of a knife (15), broach shell (16), broach shell holder (17); Described physical construction module with base (2) for benchmark, base (2) is installed air cylinder support (5), pair of guide rails axle (4), handle of a knife guide frame (6) and sensor mount (7), and cylinder (1) is arranged on air cylinder support (5); Sliding support plate (3) is passed by pair of guide rails axle (4) after loading linear bearing (11), cylinder (1) projecting shaft and the nut lock of sliding support plate (3) right-hand member through hole are connected, and sliding support plate (3) are provided with broach shell holder (17) and broach shell (16); The handle of a knife axis of guide (12) is clamped by the combination of collet chuck (14) and chuck pressure cap (13) by handle of a knife (15), and the handle of a knife axis of guide (12) is through the linear bearing (11) on handle of a knife guide frame (6); Be threaded connection, successively the handle of a knife axis of guide (12), the first web member (8), pull pressure sensor (9), the second web member (10) are connected from left to right, finally by the second web member (10) through sensor mount (7) and by a pair nut lock on sensor mount (7).
2. according to tool magazine broach shell slotting tool power according to claim 1, power of drawing sword and duty detection system, it is characterized in that: described control module comprises PLC (28), relay (27), 3 position-5 way solenoid directional control valve (25), the first magnetic switch (21), the second magnetic switch (22); Described gas path module comprises air compressor (23), source of the gas process three linked piece (24), 3 position-5 way solenoid directional control valve (25), one-way throttle valve (26), cylinder (1); In described control module, PLC (28) output terminal is connected with the control end of two relays (27), two relay (27) output terminals are connected with the electromagnet at 3 position-5 way solenoid directional control valve (25) two ends respectively, place the first magnetic switch (21) and the second magnetic switch (22) respectively at the two ends of cylinder (1) pillar, two magnetic switchs are connected with PLC (28) input end respectively simultaneously.
3. according to tool magazine broach shell slotting tool power according to claim 1, power of drawing sword and duty detection system, it is characterized in that: in described gas path module, air compressor (23) gas outlet is connected with the air intake opening of source of the gas process three linked piece (24), the gas outlet of source of the gas process three linked piece (24) is connected with the air intake opening of 3 position-5 way solenoid directional control valve (25), two gas outlets of 3 position-5 way solenoid directional control valve (25) are connected with the air intake opening of one-way throttle valve (26) respectively, the gas outlet of one-way throttle valve (26) is connected with the air intake opening of cylinder (1) respectively.
4. according to tool magazine broach shell slotting tool power according to claim 1, power of drawing sword and duty detection system, it is characterized in that: described data acquisition and processing (DAP) module comprises pull pressure sensor (9), signal conditioner (29), data collecting card (30), industrial computer (31), the 3rd magnetic switch (18); In described data acquisition and processing (DAP) module, pull pressure sensor (9) output terminal is connected with signal conditioner (29) input end, signal conditioner (29) output terminal is all connected with data collecting card (30) input channel with the 3rd magnetic switch (18), data collecting card (30) is inserted in the PCI slot of industrial computer (31), and wherein the 3rd magnetic switch (18) is placed on cylinder (1) pillar.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520337898.1U CN204730969U (en) | 2015-05-24 | 2015-05-24 | A kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520337898.1U CN204730969U (en) | 2015-05-24 | 2015-05-24 | A kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system |
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| CN204730969U true CN204730969U (en) | 2015-10-28 |
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| CN201520337898.1U Expired - Fee Related CN204730969U (en) | 2015-05-24 | 2015-05-24 | A kind of tool magazine broach shell slotting tool power, power of drawing sword and duty detection system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106392731A (en) * | 2016-12-13 | 2017-02-15 | 吉林大学 | Tool-blocking tool-dropping fault early-warning device for circular disc type manipulator tool magazine |
| CN107101782A (en) * | 2017-06-15 | 2017-08-29 | 燕山大学 | It is a kind of to be used for the intelligent handle of a knife static demarcating device of two-dimentional Milling Force detection |
| CN108204924A (en) * | 2016-12-16 | 2018-06-26 | 丹东富田精工机械有限公司 | One kind is chosen power and the full-automatic detector of chimeric length |
| CN109702557A (en) * | 2019-02-25 | 2019-05-03 | 西南科技大学 | A kind of knife handle slotting tool power and power real-time detecting system of drawing sword |
| KR101979436B1 (en) * | 2018-03-06 | 2019-05-15 | 주식회사 우성마그네트 | Horizontal absorption force and internal pressure gauge using electronic magnetic chuck |
| CN114526300A (en) * | 2022-02-25 | 2022-05-24 | 中信戴卡股份有限公司 | Unidirectional automatic pneumatic system braking device |
| CN114526300B (en) * | 2022-02-25 | 2024-04-26 | 中信戴卡股份有限公司 | Unidirectional automatic pneumatic system braking device |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106392731A (en) * | 2016-12-13 | 2017-02-15 | 吉林大学 | Tool-blocking tool-dropping fault early-warning device for circular disc type manipulator tool magazine |
| CN108204924A (en) * | 2016-12-16 | 2018-06-26 | 丹东富田精工机械有限公司 | One kind is chosen power and the full-automatic detector of chimeric length |
| CN108204924B (en) * | 2016-12-16 | 2024-01-16 | 丹东富田精工机械有限公司 | Full-automatic detection method for extracting force and embedding length |
| CN107101782A (en) * | 2017-06-15 | 2017-08-29 | 燕山大学 | It is a kind of to be used for the intelligent handle of a knife static demarcating device of two-dimentional Milling Force detection |
| KR101979436B1 (en) * | 2018-03-06 | 2019-05-15 | 주식회사 우성마그네트 | Horizontal absorption force and internal pressure gauge using electronic magnetic chuck |
| CN109702557A (en) * | 2019-02-25 | 2019-05-03 | 西南科技大学 | A kind of knife handle slotting tool power and power real-time detecting system of drawing sword |
| CN114526300A (en) * | 2022-02-25 | 2022-05-24 | 中信戴卡股份有限公司 | Unidirectional automatic pneumatic system braking device |
| CN114526300B (en) * | 2022-02-25 | 2024-04-26 | 中信戴卡股份有限公司 | Unidirectional automatic pneumatic system braking device |
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