CA1249353A - Method of discriminating fitting pressure for links on a track press - Google Patents
Method of discriminating fitting pressure for links on a track pressInfo
- Publication number
- CA1249353A CA1249353A CA000486585A CA486585A CA1249353A CA 1249353 A CA1249353 A CA 1249353A CA 000486585 A CA000486585 A CA 000486585A CA 486585 A CA486585 A CA 486585A CA 1249353 A CA1249353 A CA 1249353A
- Authority
- CA
- Canada
- Prior art keywords
- pressure
- press
- fitting
- time
- predetermined
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/08—Means for indicating or recording, e.g. for remote indication
- G01L19/12—Alarms or signals
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automatic Assembly (AREA)
- Control Of Presses (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A method to properly discriminate fitting pressure of articulated track links. Loading pressure in the ram of a track press is compared with both the lower and upper limit pressure values which are prescribed with reference to the range of fitting pressure specified for the links. Fitting of a link is determined acceptable when a sum of the press load-ing time is longer than a predetermined value while press pressure is maintained within the range between the lower and upper pressure values; whereas it is determined unacceptable when the sum of press loading time is shorter than the prede-termined one or when time in which press pressure exceeds the upper limit pressure is longer than a predetermined time.
A method to properly discriminate fitting pressure of articulated track links. Loading pressure in the ram of a track press is compared with both the lower and upper limit pressure values which are prescribed with reference to the range of fitting pressure specified for the links. Fitting of a link is determined acceptable when a sum of the press load-ing time is longer than a predetermined value while press pressure is maintained within the range between the lower and upper pressure values; whereas it is determined unacceptable when the sum of press loading time is shorter than the prede-termined one or when time in which press pressure exceeds the upper limit pressure is longer than a predetermined time.
Description
~9353 The present invention relates to a method of dis-criminating fitting pressure during an assembly operation of articulated track links on a track press and more particularly to a method of discriminating whether or not each of the links constituting a line of track chain is press fitted onto a pln rotatably held in a bushing within a properly determined range of fitting pressure when the track chain is assembled for tractor or the like track vehicles.
As is well known, fitting pressure for links is specified for each of the kinds of track vehicles such as a tractor. For this reason, pressure fitting is achieved within the specified pressure range when a line of articulated track chain is assembled.
Discriminating of fitting pressure is hitherto achieved by visually confirming that a pressure gauge for indicating ram pressure in a track press indicates the exist-ing pressure higher than the minimum value or lower than the maximum value. However, the conventional method of discrimi-nating fitting pressure has drawbacks in that discriminating20 is achieved at a lower operational efficiency and an lntensity of press fitting fluctuates from link to link because the pressure gauge fails to indicate actual fitting pressure because it indicates also instantaneous peak pressure.
When the conventional simple method of discriminat-ing fitting pressure is employed, a link is determined unac-ceptable if the press pressure detected by the pressure gauge instantaneously exceeds a predetermined upper limit but in practical press working there tends to be instantaneously gen-erated excessively high pressure due to existence of the burr30 or small projection on t~e fitting surface. However, experi-ences illustrate that the link which is subjected to press fitting with normal fitting pressure after removal of a burr $
~L29~353 or small projectlon is different from the case when a link is press fitted with excessively high f:Ltting pressure and there-fore the first mentioned link mainta:Lns a normal intensity of the press fitting.
The present invention is adapted not to detect that press pressure used for an assembly operation is held at a level higher than the upper limit value or lower than the lower limit value but to make a decision as to whether the applied fitting pressure is acceptable or unacceptable in lo dependence on the fact that the time in which pressure kept in the specified range of pressure is loaded within a predeter-mined pushing ti~e T or the press fitting distance is longer than a predetermined time. Further, the present invention is intended not to determine as unacceptable a press fitting immediately when it is found that pushing or press time is shorter than the predetermined time even when press pressure exceeds the upper limit value whereby an average intensity of press fitting or fitting pressure is utilized as a standard for making a decision.
Specifically, a basic principle of the present invention is such that the case where a predetermined press fitting time T, as measured from the point of time when the end faces of pins or bushings come in engagement to the fit-ting holes in a link to start a fitting operation or a sum Sta of press loading time for which press pressure is main-tained within a range, as defined between both the predeter-mined lower and upper limit pressures while press fitting is achieved by a press fittlng distance, is longer than a prede-termined value relative to the predetermined fitting time is determined acceptable and in the case where the same is shorter than the aforesaid value is determined unacceptable.
In addition to the fact that press fitting is deter-~2~93~i3 mined acceptable or unacceptable in accordance with the prin-ciple of the invention as described above, the case where tlme tb in which fitting pressure exceeds the upper limit pressure level is longer than a predetermined time R is as detected unacceptable.
According to the invention fitting time T is deter-mined in dependence on the length of the link fitting holes provided that an operational speed of the ram is maintained constant, and it has a certain relation relative to the dis-tance of press fitting of the links. For this reason either of the fitting time and fitting distance may be employed as a standard for carrying out the method of the invention. How-ever, the description will be made below as to the case where fitting time is employed as the standard for the purpose of simplification of illustration and description.
Predetermlned value S ls represented ln the form of percentages relative to fittlng time T and it ls normally determined ln the range of 55 to 88%.
Now, time ta in which press pressure exceeds the lower limit pressure value or lt is maintained within the range of pressure higher than the lower limit pressure and lower than the upper limit pressure during the step of press working, that is, for the period of fitting time T has a cer-tain relation relative to the fitting time T when the relation is represented in the form of ratio (Q%) as follows.
Q = ( ~ ta X 100 ) % --- (1) Thus, discrimination is carried out by comparing processing result Q with predetermined value S.
Further, according to the invention time R ln whlch pressure in excess of thè upper limit value PH is permissively loaded is experientially determined in dependence on the sur-~Z49353 face condition of the pin and other components. In practice, it is normally determined in the range of 0.3 to 0.5 second.
Thus according to the present invention there is provided a method of discriminating fltting pressure during an assembly operation for articulated track links on a track press essentially comprising the steps of: detecting loadtng pressure in a ram during assembly operation of a link, compar-ing the detected loading pressure with a lower limit pressure value as well as an upp~r limit pressure value both of which are predetermined with reference to a range of fitting pres-sure specified for the link, predetermining allowable time in which loading pressure in excess of the predetermined upper limit pressure value can be loaded, and carrying out discrimi-nation in dependence on whether or not a sum of pressure load-ing time at a level of loading pressure higher than the prede-termined lower limit pressure value during the pushing opera-tion of the track press is longer than a predetermined time, while excess pressure appearing within the allowable time dur-ing the pushing operation of the track press is neglected.
Suitably fitting of a link is determined acceptable when a sum of press loading time is longer than a predetermined value while press pressure is maintained within the range between the predetermined lower and upper pressure values and fitting of the link is determined unacceptable when the sum of press loading time is shorter than the predetermined one. Desirably fitting of a link is determined unacceptable when time in which press pressure exceeds the upper limit pressure value is longer than a predetermined time during a fitting operation.
The present invention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a fràgmentary plan view of a track press,illustrating how assembly is successively effected for links;
~L2~93~3 Fig. 2 is a block diagram illustrating electrical circuits for controlling operation o:E the fitting pressure discriminating apparatus; and Fig.s 3 to 6 are each a graph illustrating a rela-tion of fitting pressure versus time, respectively.
Referring flrst to Fig. 1, a line of track chaln 1 is successively assembled by way of the steps of causing fit-ting holes 7a and 7b on an opposing pair of track links 6 to come in fitting engagement onto both the end parts of pins 3 rotatably held in bushings ~ which are placed on the jaw insert 2 and repeating the foregoing operation for other llnks to be assembled articulated on the track chain 1.
In the drawing reference numeral 8 designates a pushing ram. AS is apparent from the drawlng, two pushing rams 8 are mounted in symmetrical relation relative to the ~aw lnsert 2 and they are actuated separately to move back and forth. Further, reference numeral 9 designates a pressure sensor which is disposed mldway of the hydraulic circuit for each of the rams 8.
An example of discrlminating apparatus to which the present invention is applied is illustrated in Fig. 2. An electrical output form the pressure sensor 9 is applied into a meter relay 10 in the illustrated embodiment.
The meter relay 10 includes a switching circuit 11 adapted to output ON signals after the pressure changing point tl is detected, outputting of ON signals is effected irrespec-tive of how the pushing pressure varies, a lower limit level switch 12 is adapted to output ON signals only when the input is compared with a predetermined lower limit value PL and lt is found that the former exceeds the latter and an upper limit level switch 13 is adapted to generate an output when it is found that the input exceeds a predetermined upper limit level ~Z~9353 switch 13. Output from each of the above-mentioned switches becomes a corresponding gate signal for respective pulse coun-ters 14, 15 and 16.
Incidentally, the gate signal for the pulse counter 15 may be a logic output comprising the output from the lower limit level switching circuit 12 and the output from the upper limit level switching circuit 13. Alternatively, it may be an output only from the lower limit level switching circuit 12, because the predetermined allowable time R is short and an NG
signal is outputted in such a manner as described later when an inequality R<tb is established.
In the drawing reference numeral 17 designates a clock pulse generator adapted to be activated by means of a pressure swltch 18 which serves to detect the pushing opera-tion of the ram and stop its operation in response to a signal output from a position switch 19 which serves to output a sig-nal which represents the completion of pushing operation (the extreme end of the fitting operation).
Further, in the drawing reference numeral 20 desig-nates a processing and discriminating circuit. This clrcuit 20 is adapted to calculate the time Ta in which an inequal-ity PH>PL is established during time T of the step of the pushing operation or in which the input exceeds PL and more-over carry out processing in accordance with the formula (1) to generate an OK signal when an inequality S<Q is established as a result of comparing Q (result of processing) with S
(predetermlned value) and generate an NG signal when an inequality S>Q is established in the same way whereby an alarm device such as buzzer, lamp or the like means is activated.
Specifically, when the press pressure varies prop-erly as illustrated in F~g. 3, this operating state is natu-rally represented by an OK signal but when time ta = tal +
1'~49353 ta2 + ~~~ in which press pressure is maintained within a spec-ified pressure range during time T of the step of the pushlng operation is short and the processing result Q is smaller than predetermined value S as illustrated in Fig. 4, an NG signal is outputted.
The counter 16 outputs a pulse signal equivalent to excessive time tb when press pressure exceeds PH. Further, the comparing circuit 21 makes a comparison between the excess time tb and the predetermined time R so that it outputs an NG
signal when an inequality tb>R is established and at the same time interrupts feeding of pressurized hydraulic oil to the ram cylinder. However, when an inequality tb_R is estab-lished, a signal is generated which clears the content con-tained in the counter 16.
For this reason the NG signal is generated in the case as illustrated in Fig. 5 but no NG signal is outputted in the case as illustrated in Fig. 6.
The position switch 19 disposed in the discriminat-ing apparatus as described above can be utilized as a limit switch for limiting press fitting length for a certain link, wherein the press fitting length varies in dependence on the type of track press used for the above-mentioned purpose.
It should, of course, be understood that the meter relay 10 may be fully replaced with an electronic circuit.
As is well known, fitting pressure for links is specified for each of the kinds of track vehicles such as a tractor. For this reason, pressure fitting is achieved within the specified pressure range when a line of articulated track chain is assembled.
Discriminating of fitting pressure is hitherto achieved by visually confirming that a pressure gauge for indicating ram pressure in a track press indicates the exist-ing pressure higher than the minimum value or lower than the maximum value. However, the conventional method of discrimi-nating fitting pressure has drawbacks in that discriminating20 is achieved at a lower operational efficiency and an lntensity of press fitting fluctuates from link to link because the pressure gauge fails to indicate actual fitting pressure because it indicates also instantaneous peak pressure.
When the conventional simple method of discriminat-ing fitting pressure is employed, a link is determined unac-ceptable if the press pressure detected by the pressure gauge instantaneously exceeds a predetermined upper limit but in practical press working there tends to be instantaneously gen-erated excessively high pressure due to existence of the burr30 or small projection on t~e fitting surface. However, experi-ences illustrate that the link which is subjected to press fitting with normal fitting pressure after removal of a burr $
~L29~353 or small projectlon is different from the case when a link is press fitted with excessively high f:Ltting pressure and there-fore the first mentioned link mainta:Lns a normal intensity of the press fitting.
The present invention is adapted not to detect that press pressure used for an assembly operation is held at a level higher than the upper limit value or lower than the lower limit value but to make a decision as to whether the applied fitting pressure is acceptable or unacceptable in lo dependence on the fact that the time in which pressure kept in the specified range of pressure is loaded within a predeter-mined pushing ti~e T or the press fitting distance is longer than a predetermined time. Further, the present invention is intended not to determine as unacceptable a press fitting immediately when it is found that pushing or press time is shorter than the predetermined time even when press pressure exceeds the upper limit value whereby an average intensity of press fitting or fitting pressure is utilized as a standard for making a decision.
Specifically, a basic principle of the present invention is such that the case where a predetermined press fitting time T, as measured from the point of time when the end faces of pins or bushings come in engagement to the fit-ting holes in a link to start a fitting operation or a sum Sta of press loading time for which press pressure is main-tained within a range, as defined between both the predeter-mined lower and upper limit pressures while press fitting is achieved by a press fittlng distance, is longer than a prede-termined value relative to the predetermined fitting time is determined acceptable and in the case where the same is shorter than the aforesaid value is determined unacceptable.
In addition to the fact that press fitting is deter-~2~93~i3 mined acceptable or unacceptable in accordance with the prin-ciple of the invention as described above, the case where tlme tb in which fitting pressure exceeds the upper limit pressure level is longer than a predetermined time R is as detected unacceptable.
According to the invention fitting time T is deter-mined in dependence on the length of the link fitting holes provided that an operational speed of the ram is maintained constant, and it has a certain relation relative to the dis-tance of press fitting of the links. For this reason either of the fitting time and fitting distance may be employed as a standard for carrying out the method of the invention. How-ever, the description will be made below as to the case where fitting time is employed as the standard for the purpose of simplification of illustration and description.
Predetermlned value S ls represented ln the form of percentages relative to fittlng time T and it ls normally determined ln the range of 55 to 88%.
Now, time ta in which press pressure exceeds the lower limit pressure value or lt is maintained within the range of pressure higher than the lower limit pressure and lower than the upper limit pressure during the step of press working, that is, for the period of fitting time T has a cer-tain relation relative to the fitting time T when the relation is represented in the form of ratio (Q%) as follows.
Q = ( ~ ta X 100 ) % --- (1) Thus, discrimination is carried out by comparing processing result Q with predetermined value S.
Further, according to the invention time R ln whlch pressure in excess of thè upper limit value PH is permissively loaded is experientially determined in dependence on the sur-~Z49353 face condition of the pin and other components. In practice, it is normally determined in the range of 0.3 to 0.5 second.
Thus according to the present invention there is provided a method of discriminating fltting pressure during an assembly operation for articulated track links on a track press essentially comprising the steps of: detecting loadtng pressure in a ram during assembly operation of a link, compar-ing the detected loading pressure with a lower limit pressure value as well as an upp~r limit pressure value both of which are predetermined with reference to a range of fitting pres-sure specified for the link, predetermining allowable time in which loading pressure in excess of the predetermined upper limit pressure value can be loaded, and carrying out discrimi-nation in dependence on whether or not a sum of pressure load-ing time at a level of loading pressure higher than the prede-termined lower limit pressure value during the pushing opera-tion of the track press is longer than a predetermined time, while excess pressure appearing within the allowable time dur-ing the pushing operation of the track press is neglected.
Suitably fitting of a link is determined acceptable when a sum of press loading time is longer than a predetermined value while press pressure is maintained within the range between the predetermined lower and upper pressure values and fitting of the link is determined unacceptable when the sum of press loading time is shorter than the predetermined one. Desirably fitting of a link is determined unacceptable when time in which press pressure exceeds the upper limit pressure value is longer than a predetermined time during a fitting operation.
The present invention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a fràgmentary plan view of a track press,illustrating how assembly is successively effected for links;
~L2~93~3 Fig. 2 is a block diagram illustrating electrical circuits for controlling operation o:E the fitting pressure discriminating apparatus; and Fig.s 3 to 6 are each a graph illustrating a rela-tion of fitting pressure versus time, respectively.
Referring flrst to Fig. 1, a line of track chaln 1 is successively assembled by way of the steps of causing fit-ting holes 7a and 7b on an opposing pair of track links 6 to come in fitting engagement onto both the end parts of pins 3 rotatably held in bushings ~ which are placed on the jaw insert 2 and repeating the foregoing operation for other llnks to be assembled articulated on the track chain 1.
In the drawing reference numeral 8 designates a pushing ram. AS is apparent from the drawlng, two pushing rams 8 are mounted in symmetrical relation relative to the ~aw lnsert 2 and they are actuated separately to move back and forth. Further, reference numeral 9 designates a pressure sensor which is disposed mldway of the hydraulic circuit for each of the rams 8.
An example of discrlminating apparatus to which the present invention is applied is illustrated in Fig. 2. An electrical output form the pressure sensor 9 is applied into a meter relay 10 in the illustrated embodiment.
The meter relay 10 includes a switching circuit 11 adapted to output ON signals after the pressure changing point tl is detected, outputting of ON signals is effected irrespec-tive of how the pushing pressure varies, a lower limit level switch 12 is adapted to output ON signals only when the input is compared with a predetermined lower limit value PL and lt is found that the former exceeds the latter and an upper limit level switch 13 is adapted to generate an output when it is found that the input exceeds a predetermined upper limit level ~Z~9353 switch 13. Output from each of the above-mentioned switches becomes a corresponding gate signal for respective pulse coun-ters 14, 15 and 16.
Incidentally, the gate signal for the pulse counter 15 may be a logic output comprising the output from the lower limit level switching circuit 12 and the output from the upper limit level switching circuit 13. Alternatively, it may be an output only from the lower limit level switching circuit 12, because the predetermined allowable time R is short and an NG
signal is outputted in such a manner as described later when an inequality R<tb is established.
In the drawing reference numeral 17 designates a clock pulse generator adapted to be activated by means of a pressure swltch 18 which serves to detect the pushing opera-tion of the ram and stop its operation in response to a signal output from a position switch 19 which serves to output a sig-nal which represents the completion of pushing operation (the extreme end of the fitting operation).
Further, in the drawing reference numeral 20 desig-nates a processing and discriminating circuit. This clrcuit 20 is adapted to calculate the time Ta in which an inequal-ity PH>PL is established during time T of the step of the pushing operation or in which the input exceeds PL and more-over carry out processing in accordance with the formula (1) to generate an OK signal when an inequality S<Q is established as a result of comparing Q (result of processing) with S
(predetermlned value) and generate an NG signal when an inequality S>Q is established in the same way whereby an alarm device such as buzzer, lamp or the like means is activated.
Specifically, when the press pressure varies prop-erly as illustrated in F~g. 3, this operating state is natu-rally represented by an OK signal but when time ta = tal +
1'~49353 ta2 + ~~~ in which press pressure is maintained within a spec-ified pressure range during time T of the step of the pushlng operation is short and the processing result Q is smaller than predetermined value S as illustrated in Fig. 4, an NG signal is outputted.
The counter 16 outputs a pulse signal equivalent to excessive time tb when press pressure exceeds PH. Further, the comparing circuit 21 makes a comparison between the excess time tb and the predetermined time R so that it outputs an NG
signal when an inequality tb>R is established and at the same time interrupts feeding of pressurized hydraulic oil to the ram cylinder. However, when an inequality tb_R is estab-lished, a signal is generated which clears the content con-tained in the counter 16.
For this reason the NG signal is generated in the case as illustrated in Fig. 5 but no NG signal is outputted in the case as illustrated in Fig. 6.
The position switch 19 disposed in the discriminat-ing apparatus as described above can be utilized as a limit switch for limiting press fitting length for a certain link, wherein the press fitting length varies in dependence on the type of track press used for the above-mentioned purpose.
It should, of course, be understood that the meter relay 10 may be fully replaced with an electronic circuit.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A method of discriminating fitting pressure dur-ing an assembly operation for articulated track links on a track press essentially comprising the steps of: detecting loading pressure in a ram during assembly operation of a link, comparing the detected loading pressure with a lower limit pressure value as well as an upper limit pressure value both of which are predetermined with reference to a range of fit-ting pressure specified for the link, predetermining allowable time in which loading pressure in excess of the predetermined upper limit pressure value can be loaded, and carrying out discrimination in dependence on whether or not a sum of pres-sure loading time at a level of loading pressure higher than the predetermined lower limit pressure value during the push-ing operation of the track press is longer than a predeter-mined time, while excess pressure appearing within the allow-able time during the pushing operation of the track press is neglected.
2. A method as defined in claim 1, wherein fitting of a link is determined acceptable when a sum of press loading time is longer than a predetermined value while press pressure is maintained within the range between the predetermined lower and upper pressure values and fitting of the link is deter-mined unacceptable when the sum of press loading time is shorter than the predetermined one.
3. A method as defined in claim 1, wherein fitting of a link is determined unacceptable when time in which press pressure exceeds the upper limit pressure value is longer than a predetermined time during a fitting operation.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP95647/85 | 1985-05-07 | ||
| JP60095647A JPS61253200A (en) | 1985-05-07 | 1985-05-07 | Method for discriminating pressure for assembling and fitting track link of track press |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1249353A true CA1249353A (en) | 1989-01-24 |
Family
ID=14143297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000486585A Expired CA1249353A (en) | 1985-05-07 | 1985-07-10 | Method of discriminating fitting pressure for links on a track press |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPS61253200A (en) |
| KR (1) | KR900000662B1 (en) |
| CA (1) | CA1249353A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110449545A (en) * | 2019-08-29 | 2019-11-15 | 青岛征和链传动有限公司 | A kind of thin repacking of chain assembly machine goes out device and method |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63237825A (en) * | 1987-03-25 | 1988-10-04 | Honda Motor Co Ltd | Oil seal press-fit device |
| JPH0220700A (en) * | 1988-07-08 | 1990-01-24 | Fanuc Ltd | Method for controlling press with safety function |
| JP5466582B2 (en) * | 2010-06-08 | 2014-04-09 | 株式会社神戸製鋼所 | Bush press-fitting inspection device, inspection method, inspection program, and bush press-fitting device |
| JP5849709B2 (en) * | 2012-01-11 | 2016-02-03 | トヨタ自動車株式会社 | Control method of press-fitting device |
-
1985
- 1985-05-07 JP JP60095647A patent/JPS61253200A/en active Granted
- 1985-06-29 KR KR1019850004684A patent/KR900000662B1/en not_active IP Right Cessation
- 1985-07-10 CA CA000486585A patent/CA1249353A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110449545A (en) * | 2019-08-29 | 2019-11-15 | 青岛征和链传动有限公司 | A kind of thin repacking of chain assembly machine goes out device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61253200A (en) | 1986-11-11 |
| JPH0334440B2 (en) | 1991-05-22 |
| KR860009300A (en) | 1986-12-22 |
| KR900000662B1 (en) | 1990-02-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |