Crankshaft toggle rod transmission mechanism of overhead oil cylinder press

Abstract

A crankshaft toggle rod transmission mechanism of an overhead oil cylinder press comprises a transmission shaft, an eccentric sleeve and a toggle rod mechanism, and the toggle rod mechanism comprises an upper connecting rod, an upper connecting rod shaft pin, a connecting rod, a positioning shaft, a lower connecting rod, an upper shaft pin and a lower pin shaft; the transmission shaft is rotatably supported by the upper cross beam and is the same as the feeding direction of the press machine, the eccentric sleeve is installed on the transmission shaft, the upper connecting rod is installed outside the eccentric sleeve and can rotate relative to the eccentric sleeve, one end of the connecting rod is connected with one end of the upper connecting rod through an upper connecting rod pin shaft, and the other end of the connecting rod is connected with one end of the lower connecting rod through an upper shaft pin. One end of the lower connecting rod is connected with the connecting rod, the middle of the lower connecting rod is sleeved on a positioning shaft in a penetrating manner and can rotate relative to the positioning shaft, the other end of the lower connecting rod is connected with a sliding block through a lower pin shaft, the positioning shaft is mounted on an upper cross beam and is fixedly supported by the upper cross beam, the upper connecting rod pin shaft and the upper pin shaft are fixedly mounted at two ends of the connecting rod respectively, and the lower pin shaft is fixedly mounted on the sliding block; and at least three groups of toggle rod mechanisms and three corresponding eccentric sleeves are arranged.

Description

Technical Field

[0001] This utility model relates to a crankshaft elbow transmission mechanism for a top-mounted hydraulic cylinder press. Background Technology

[0002] In the top-mounted hydraulic cylinder crankshaft toggle lever type four-column press disclosed in Chinese patent document CN203293555U, the crankshaft is set perpendicular to the feeding direction. The crankshaft is connected to the upper and lower toggle levers via connecting rods. The connecting rods, upper and lower toggle levers are hinged together with a square slider via a central shaft. The upper and lower planes of the square slider can move laterally in the groove of the upper crossbeam. The upper end of the upper toggle lever is connected to the slider, the lower end of the lower toggle lever is connected to the guide post, and the lower end of the guide post is connected to the slider. The crankshaft rotates, driving the toggle lever mechanism to drive the slider to move up and down, thereby realizing the stamping action.

[0003] This type of elbow structure is well-suited for stamping processes requiring precision pressing because its bottom dead center dwell time is longer than that of a connecting rod structure. However, its structure is particularly complex, especially when the slide length is long. Multiple force application points may need to be added, which means adding multiple sets of elbow mechanisms, making it even more complicated. At the same time, this type of elbow mechanism also has high requirements for processing and assembly to ensure the synchronization of multiple force application points. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to overcome the above-mentioned defects of the prior art and provide a crankshaft elbow transmission mechanism for a top-mounted hydraulic cylinder press. It has a simple structure, is easy to process and assemble, and can easily ensure the synchronization of multiple force application points, thereby ensuring the stamping accuracy of the press.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows:

[0006] A crankshaft toggle transmission mechanism for an overhead hydraulic cylinder press includes a transmission shaft, an eccentric sleeve, and a toggle mechanism. The toggle mechanism includes an upper connecting rod, an upper connecting rod pin, a connecting rod, a positioning shaft, a lower connecting rod, an upper shaft pin, and a lower pin. The transmission shaft is rotatably supported by an upper crossbeam and is in the same direction as the feed direction of the press. The eccentric sleeve is mounted on the transmission shaft. The upper connecting rod is mounted outside the eccentric sleeve and can rotate relative to it. One end of the connecting rod is connected to one end of the upper connecting rod via an upper connecting rod pin, and the other end is connected to one end of the lower connecting rod via an upper shaft pin. The connecting rod is sleeved on the positioning shaft and can rotate relative to it. The other end of the lower connecting rod is connected to a slider via a lower pin. The positioning shaft is mounted on the upper crossbeam and is fixedly supported by it. The upper connecting rod pin and the upper shaft pin are respectively fixedly mounted at both ends of the connecting rod, and the lower pin is fixedly mounted on the slider. The toggle mechanism consists of at least three sets and three corresponding eccentric sleeves.

[0007] Better still, the elbow mechanism consists of three sets and three corresponding eccentric sleeves. One eccentric sleeve is installed in the middle of the drive shaft, with its center corresponding to the center line of the press. The other two eccentric sleeves are installed symmetrically with respect to the center line. Since the eccentric sleeves and elbow mechanisms are all installed on a single drive shaft, this elbow transmission mechanism has a simple structure and is easy to process and assemble. It ensures the synchronicity of force transmission of each elbow mechanism, thereby ensuring the stamping accuracy of the press.

[0008] It can also be integrated with the drive shaft. In this way, when the drive shaft moves, the change in phase of the eccentric sleeve causes the elbow mechanism to drive the slider to move up and down, thereby realizing the stamping action.

[0009] To overcome the lateral force generated by the unidirectional movement of the elbow lever mechanism, when there are three sets of elbow lever mechanisms, the middle eccentric sleeve and the two side eccentric sleeves can be installed on the transmission shaft with a certain phase difference, and the elbow lever mechanisms can be installed in opposite directions. In this way, the movement directions of the middle connecting rod and the left and right side connecting rods are opposite, which can balance most of the lateral force and ensure the movement accuracy of the slider.

[0010] Better still, the elbow mechanism consists of four sets and four eccentric sleeves, with the two middle eccentric sleeves and the two outer eccentric sleeves having a certain phase difference on the drive shaft, and the elbow mechanism is installed in opposite directions.

[0011] Compared with the prior art, the advantages of this utility model are: since the eccentric sleeve and the elbow mechanism are all mounted on a single transmission shaft, the structure is simple, and the processing and assembly are easy. It is easy to ensure the synchronization of force transmission of each elbow mechanism, so as to ensure the stamping accuracy of the press. Attached Figure Description

[0012] Figure 1 This is a front structural schematic diagram of a crankshaft elbow transmission mechanism of a top-mounted hydraulic cylinder press according to an embodiment of the present invention.

[0013] Figure 2 This is a schematic diagram of the elbow mechanism of a crankshaft elbow transmission mechanism of a top-mounted hydraulic cylinder press according to an embodiment of the present invention.

[0014] Figure 3 This is a schematic diagram showing the state of the middle elbow and the two side elbows of the crankshaft elbow transmission mechanism of a top-mounted hydraulic cylinder press in the bottom dead center position according to an embodiment of the present invention.

[0015] Figure 4 This is a schematic diagram showing the state of the middle elbow and the two side elbows in the crankshaft elbow transmission mechanism of a top-mounted hydraulic cylinder press in the middle position according to an embodiment of this utility model.

[0016] Figure 5 This is a schematic diagram showing the state of the middle elbow and the two side elbows when the crankshaft elbow transmission mechanism of a top-mounted hydraulic cylinder press is at the top dead center position, according to an embodiment of this utility model. Detailed Implementation

[0017] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0018] like Figures 1-2 As shown, an elbow lever transmission mechanism for a top-mounted hydraulic cylinder press includes a transmission shaft 23, an eccentric sleeve 4, and an elbow lever mechanism.

[0019] The elbow lever mechanism includes an upper connecting rod 1, an upper connecting rod pin 2, a connecting rod 3, a positioning shaft 5, a lower connecting rod 6, an upper shaft pin 7, and a lower pin shaft 8.

[0020] The drive shaft 23 is rotatably supported by the upper crossbeam 9 and is in the same direction as the feed of the press. The eccentric sleeve 4 is mounted on the drive shaft 23, or it can be integrated with the drive shaft 23. The upper connecting rod 1 is mounted outside the eccentric sleeve 4 and can rotate relative to the eccentric sleeve 4. One end of the connecting rod 3 is connected to one end of the upper connecting rod 3 through the upper connecting rod pin 2, and the other end is connected to one end of the lower connecting rod 6 through the upper shaft pin 7. The middle part is sleeved on the positioning shaft 5 and can rotate relative to the positioning shaft 5. The other end of the lower connecting rod 6 is connected to the slider 14 through the lower pin 8. The positioning shaft 5 is mounted on the upper crossbeam 9 and is fixedly supported by the upper crossbeam 9. The upper connecting rod pin 2 and the upper shaft pin 7 are respectively fixedly mounted on both ends of the connecting rod 3, and the lower pin 8 is fixedly mounted on the slider 14.

[0021] In this way, the drive shaft 23 rotates, and through the phase change of the eccentric sleeve 4, the elbow mechanism drives the slider to move up and down, thereby realizing the stamping action.

[0022] The elbow mechanism consists of at least three sets, with three lower connecting rods 6 connected to the slider 14. Three eccentric sleeves 4 are correspondingly installed on the transmission shaft 23. One eccentric sleeve is installed in the middle of the transmission shaft 23, with its center corresponding to the center line B of the press. The other two eccentric sleeves are installed symmetrically with respect to the center line B. Since the eccentric sleeves and elbow mechanisms are all installed on a single transmission shaft, this elbow transmission mechanism has a simple structure, and its processing and assembly are easy. It ensures the synchronicity of force transmission of each elbow mechanism, thereby ensuring the stamping accuracy of the press.

[0023] To overcome the lateral force generated by the unidirectional motion of the lever mechanism, when there are three sets of lever mechanisms, the middle eccentric sleeve 4 and the two side eccentric sleeves 4 can be installed on the transmission shaft 23 with a certain phase difference, and the installation of the lever mechanisms is reversed. See details below. Figures 3-5 In this way, the middle connecting rod and the left and right connecting rods move in opposite directions, which can balance most of the lateral forces and ensure the movement accuracy of the slider.

[0024] When there are four sets of elbow lever mechanisms, there is a certain phase difference when the two middle eccentric sleeves 4 and the two outer eccentric sleeves 4 are installed on the transmission shaft 23, and the installation of the elbow lever mechanism is reversed.

[0025] The number of elbow mechanisms can be determined according to the length of the slider, and the installation phase of each elbow mechanism and the corresponding eccentric sleeve can also be determined according to the actual punching needs.

Claims

1. A crankshaft toggle transmission mechanism for an overhead hydraulic cylinder press, characterized in that: The device includes a drive shaft, an eccentric sleeve, and an elbow mechanism. The elbow mechanism includes an upper connecting rod, an upper connecting rod pin, a connecting rod, a positioning shaft, a lower connecting rod, an upper shaft pin, and a lower pin. The drive shaft is rotatably supported by an upper crossbeam and is in the same direction as the feed of the press. The eccentric sleeve is mounted on the drive shaft. The upper connecting rod is mounted outside the eccentric sleeve and can rotate relative to it. One end of the connecting rod is connected to one end of the upper connecting rod via an upper connecting rod pin, and the other end is connected to one end of the lower connecting rod via an upper shaft pin. The connecting rod is sleeved on the positioning shaft and can rotate relative to it. The other end of the lower connecting rod is connected to the slider via a lower pin. The positioning shaft is mounted on the upper crossbeam and is fixedly supported by it. The upper connecting rod pin and the upper shaft pin are respectively fixedly mounted at both ends of the connecting rod, and the lower pin is fixedly mounted on the slider. The elbow mechanism consists of at least three sets and three corresponding eccentric sleeves.

2. The crankshaft toggle transmission mechanism of the overhead cylinder press as described in claim 1, characterized in that: The elbow mechanism consists of three sets and three corresponding eccentric sleeves. One eccentric sleeve is installed in the middle of the drive shaft, with its center corresponding to the center line of the press. The other two eccentric sleeves are installed symmetrically with respect to the center line.

3. The crankshaft toggle transmission mechanism of the overhead cylinder press as described in claim 2, characterized in that: There is a certain phase difference between the middle eccentric sleeve and the two eccentric sleeves on the drive shaft, and the elbow mechanism is installed in opposite directions.

4. The crankshaft toggle transmission mechanism of the overhead cylinder press as described in claim 1, characterized in that: The elbow lever mechanism consists of four sets and four corresponding eccentric sleeves. The two middle eccentric sleeves and the two outer eccentric sleeves have a certain phase difference on the drive shaft, and the elbow lever mechanism is installed in opposite directions.

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