CN2301433Y - Double-section rod jack - Google Patents
Double-section rod jack Download PDFInfo
- Publication number
- CN2301433Y CN2301433Y CN 97223428 CN97223428U CN2301433Y CN 2301433 Y CN2301433 Y CN 2301433Y CN 97223428 CN97223428 CN 97223428 CN 97223428 U CN97223428 U CN 97223428U CN 2301433 Y CN2301433 Y CN 2301433Y
- Authority
- CN
- China
- Prior art keywords
- piston rod
- oil return
- oil
- double
- utility
- 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 - Fee Related
Links
- 239000010720 hydraulic oil Substances 0.000 claims abstract description 14
- 238000010992 reflux Methods 0.000 claims abstract description 9
- 239000003921 oil Substances 0.000 claims description 39
- 241000719178 Carangoides ruber Species 0.000 claims description 8
- 239000000446 fuel Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Actuator (AREA)
Abstract
The utility model relates to a double-section rod jack, belonging to the field of hoisting equipment. The utility model comprises a cylinder, a lower piston rod, and an upper piston rod in the lower piston rod. The double-section rod jack is characterized in that one side on the upper end of an inner wall of the lower piston rod is provided with a spacing slot; the lower end of the upper piston rod is provided with an unloading hole corresponding to the spacing slot; a reflux pipeline of hydraulic oil is arranged in the upper piston rod. The utility model solves the problem of automatic unloading when the upper piston rod of the double-section rod jack is lifted to the tallest. Thus, the normal and safe operation of the double-section rod jack is ensured.
Description
The utility model relates to the weight-lifting equipment field, particularly a kind of jack.
In the prior art, binodal bar jack is when load-bearing, lower piston rod is gone up earlier and is lifted, go up behind the upper piston rod and lift, when upper piston rod rises to the extreme higher position, hydraulic oil can't automatic deloading, and adopt thin red line notices operation personnel to stop pump oil, therefore tends to because misoperation makes hydraulic oil from gushing out between the piston rod or not having the act placed restrictions on and cause inner structure to damage.
The purpose of this utility model just provides a kind of simple in structure, binodal bar jack that can automatic deloading.
For achieving the above object, the utility model adopts following technical scheme: it comprises oil cylinder, lower piston rod and is in upper piston rod within the lower piston rod, a side that it is characterized in that described lower piston rod inwall upper end is provided with position-limited trough, the lower end of upper piston rod is provided with and the corresponding unloading hole of position-limited trough, is provided with the hydraulic oil reflux line in the upper piston rod.
Hydraulic oil reflux line of the present utility model is made up of oil return piston rod and the oil return pipe that is within the oil return piston rod, oil return pipe and oil return piston rod bearing fit, and captive joint with the oil cylinder bottom in the lower end of oil return pipe.The oil return piston rod also can be made up of inside and outside two piston rods of bearing fit.
Owing to adopted technique scheme, when the utility model rises to most significant bit at upper piston rod, hydraulic oil is automatically through position-limited trough and unloading hole, and inflow is positioned at the hydraulic oil reflux line of upper piston rod and has realized automatic deloading, thereby has guaranteed the normal safe work of binodal bar jack.
The utility model will be further described below in conjunction with drawings and Examples.
Fig. 1 is the generalized section of the present utility model of embodiment 1.
Fig. 2 is the generalized section of the present utility model of embodiment 2.
Embodiment 1:
With reference to accompanying drawing 1.The utility model comprises that oil cylinder 1, lower piston rod 2 and upper piston rod 3, hydraulic oil fuel feed hole 15 be located at oil cylinder 1 bottom; Lower piston rod 2 is within the oil cylinder 1, upper piston rod 3 is within the lower piston rod 2, bearing fit between them, upper end at oil cylinder 1 inwall is provided with back-up ring 4, the lower end of lower piston rod 2 is provided with and back-up ring 4 corresponding piston heads 5, deviates from oil cylinder 1 to prevent lower piston rod 2, is provided with back-up ring 6 on the top of lower piston rod 2 inwalls, be provided with and back-up ring 6 corresponding piston heads 7 in the lower end of upper piston rod 3, deviate from lower piston rod 2 to prevent upper piston rod 3; One side of the inwall of lower piston rod 2 is provided with position-limited trough 8 below back-up ring 6, upper piston rod 3 is provided with above piston head 7 and position-limited trough 8 corresponding unloading holes 9; In upper piston rod 3, be provided with the hydraulic oil reflux line, the hydraulic oil reflux line is made up of oil return piston rod 10 and oil return pipe 11, oil return piston rod 10 and upper piston rod 3 bearing fits, oil return pipe 11 be within the oil return piston rod 10 and with oil return piston rod 10 bearing fits, captive joint with oil cylinder 1 in the lower end of oil return pipe 11, upper end at oil return pipe 11 outer walls is provided with back-up ring 12, be provided with and back-up ring 12 corresponding back-up rings 13 in the lower end of oil return piston rod 10 inwalls, in case oil return piston rod 10 is deviate from oil return pipe 11; Inwall at the outer wall of the outer wall of piston head 5, piston head 7 and inwall, back-up ring 13 is respectively equipped with seal ring 14 in case leakage of oil.
When the load-bearing of binodal bar jack, upper piston rod rises to most significant bit, and piston head 7 is in position-limited trough 8 pairing height, and hydraulic oil enters the hydraulic oil reflux line by position-limited trough 8, unloading hole 9, realizes automatic deloading.
Embodiment 2:
With reference to accompanying drawing 2.Backflow piston rod 10 is made up of inside and outside two piston rods 20 and 16 of bearing fit, piston rod 20 and upper piston rod 3 bearing fits, piston rod 16 and oil return pipe 11 bearing fits, be respectively equipped with back-up ring 17,18 in the lower end of piston rod 16 inwalls, the upper end of outer wall, lower end at piston rod 20 inwalls is provided with back-up ring 19, in case piston rod 20,16 is deviate from, the inwall of back-up ring 17,19 is provided with seal ring 14 in case leakage of oil.All the other structures are with embodiment 1.
Claims (3)
1. binodal bar jack, comprise oil cylinder (1), lower piston rod (2) and be in upper piston rod (3) within the lower piston rod (2), it is characterized in that a side of described lower piston rod (2) inwall upper end is provided with position-limited trough (8), the lower end of upper piston rod (3) is provided with and the corresponding unloading hole of position-limited trough (8) (9), and upper piston rod is provided with the hydraulic oil reflux line in (3).
2. binodal bar jack as claimed in claim 1, it is characterized in that described hydraulic oil reflux line is made up of oil return piston rod (10) and the oil return pipe (11) that is in the oil return piston rod (10), oil return pipe (11) and oil return piston rod (10) bearing fit, captive joint with oil cylinder (1) bottom in the lower end of oil return pipe (11).
3. binodal bar jack as claimed in claim 2 is characterized in that described oil return piston rod (10) is made up of inside and outside two piston rods (20), (16) of bearing fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97223428 CN2301433Y (en) | 1997-06-04 | 1997-06-04 | Double-section rod jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97223428 CN2301433Y (en) | 1997-06-04 | 1997-06-04 | Double-section rod jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2301433Y true CN2301433Y (en) | 1998-12-23 |
Family
ID=33938139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97223428 Expired - Fee Related CN2301433Y (en) | 1997-06-04 | 1997-06-04 | Double-section rod jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2301433Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102700094A (en) * | 2012-06-20 | 2012-10-03 | 无锡天惠塑机有限公司 | Mold matching device |
| CN102729436A (en) * | 2012-06-11 | 2012-10-17 | 无锡天惠塑机有限公司 | Mold clamping oil cylinder |
-
1997
- 1997-06-04 CN CN 97223428 patent/CN2301433Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102729436A (en) * | 2012-06-11 | 2012-10-17 | 无锡天惠塑机有限公司 | Mold clamping oil cylinder |
| CN102700094A (en) * | 2012-06-20 | 2012-10-03 | 无锡天惠塑机有限公司 | Mold matching device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |