A fully automatic indexing chuck jam detection device

Abstract

The present invention discloses a fully automatic indexing chuck stuck detection device, characterized by comprising a stuck detection oil circuit and a hydraulic cylinder. The stuck detection oil circuit includes a two-position four-way hydraulic control valve. The first working position of the two-position four-way hydraulic control valve is controlled by the ejection oil circuit of a first ejector provided in the indexing chuck, and the second working position of the two-position four-way hydraulic control valve is controlled by a return spring. The indexing chuck has a first ejector guide cavity and a second ejector guide cavity. The first ejector guide cavity is provided with a first ejection in-position detection port, and the second ejector guide cavity is provided with a second ejection in-position detection port. The indexing chuck is provided with a first detection channel, a second detection channel, and a third detection channel. The first end of the first detection channel is connected to the first ejection in-position detection port, the first end of the second detection channel is connected to the second ejection in-position detection port, and the first end of the third detection channel is connected to the rodless cavity of the hydraulic cylinder. The device has the advantage of high detection accuracy.

Description

Technical Field

[0001] The present invention relates to the field of hydraulic technology, and in particular to a device for detecting a stuck state of a full-automatic indexing chuck. Background Art

[0002] An indexing chuck is a special type of chuck used on CNC lathes. By rotating the workpiece through a program-controlled fixture, it allows multiple surfaces to be machined in a single clamping operation. However, there is a risk associated with using indexing chucks. For various reasons, the workpiece may not index as programmed. This can lead to workpiece failure at best, or even a CNC machine crash, resulting in damage to the indexing chuck and the machine's turret and spindle.

[0003] Currently, there are mainly the following methods for detecting stuck states on indexing chucks. One method is to detect the pressure changes in the two hydraulic circuits corresponding to the two ejector pins to determine whether the chuck is indexing. Since the indexing cycle of the indexing chuck is only 0.4 seconds to 1 second, the pressure fluctuation or transmission lag, and the insensitivity of the sensor can easily lead to false alarms or missed reports. This method cannot accurately detect whether the ejector pin is in place, and this method requires six oil channels to be implemented. On the one hand, the number of accessories for the chuck will increase, thereby increasing the cost, and on the other hand, the external dimensions of the chuck will increase, which is not suitable for use in small machine tools. The other method is to detect the locked position of a ejector pin. This method can only detect one circuit. When the other circuit is stuck, it cannot be detected. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a fully automatic indexing chuck stuck detection device which has a simple structure, high detection accuracy, low cost and is suitable for use in small machine tools.

[0005] The technical solution adopted by the present invention to solve the above technical problems is:

[0006] 18. The swiftly and minutely adjusting device for a wood-planer working table as claimed in claim 1, wherein said linking rod and said adjusting base are pivotally connected to each other with a bolt, and said bolt has a round shank to contact with said linking rod. said linking rod is pivotally connected to said linking rod. said linking rod is pivotally connected to said linking rod. A first ejection in-position detection port connected to the first ejector guide cavity is provided at the full ejection position, a second ejection in-position detection port connected to the second ejector guide cavity is provided on the second ejector guide cavity corresponding to the full ejection position of the second ejector, a first detection channel, a second detection channel and a third detection channel are provided in the indexing chuck, the first detection channel is provided between the first ejector guide cavity and the two-position four-way hydraulic control valve, and a first end of the first detection channel is connected to the first ejection in-position detection port, the second detection channel is provided between the second ejector guide cavity and the two-position four-way hydraulic control valve, and a first end of the second detection channel is connected to the second ejection in-position detection port, the third detection channel is provided between the two-position four-way hydraulic control valve and the hydraulic cylinder, and a first end of the third detection channel is connected to the rodless cavity of the hydraulic cylinder;

[0007] The first push rod is pushed out, and the push-out oil circuit is under high pressure, driving the two-position four-way hydraulic control valve to move in the direction of the return spring. When the first push rod is pushed out into place, the second end of the first detection channel is connected to the first working oil port, and the second end of the third detection channel is connected to the second working oil port. At this time, the hydraulic cylinder can be pushed out normally, indicating that the first push rod is in a non-stuck state; the first push rod is retracted, and the second push rod is pushed out, and the push-out oil circuit is in a zero pressure state. Driven by the return spring, the two-position four-way hydraulic control valve moves toward the direction of the first working position. When the second push rod is pushed out into place, the second end of the second detection channel is connected to the third working oil port, and the second end of the third detection channel is connected to the fourth working oil port. At this time, the hydraulic cylinder can be pushed out normally, indicating that the second push rod is in a non-stuck state.

[0008] The hydraulic oil cylinder has a stroke detection mechanism for detecting the ejection stroke of the hydraulic oil cylinder. The stroke detection mechanism can more accurately monitor whether the hydraulic oil cylinder is ejected, thereby improving the accuracy of the detection.

[0009] The stroke detection mechanism is a proximity switch arranged behind the extended end of the piston rod of the hydraulic cylinder. It has a simple structure, low cost, and stable and accurate detection.

[0010] The proximity switch is electrically connected to an external PLC processor. Since each machine tool's built-in PLC is different, an external PLC processor forms an independent module. The machine tool only needs to be equipped with a corresponding alarm device, and the external PLC processor is connected to the alarm device. This eliminates the need for machine tool modifications, saves time, and reduces failure rates.

[0011] Compared with the prior art, the advantages of the present invention are: simple structure, few parts, only need to install a two-position four-way hydraulic control valve on the original component structure of the indexing chuck, and set a corresponding oil channel inside the indexing chuck. Through the simple oil circuit structure, it cooperates with the detection port set on the ejector guide cavity corresponding to the fully ejected position of the ejector, so as to achieve accurate detection of whether the two ejector rods are completely stuck, low cost, no impact on the overall volume of the indexing chuck, and is suitable for use in small machine tools. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a hydraulic principle diagram of the present invention when the first ejector rod is ejected into place;

[0013] Figure 2 This is a hydraulic principle diagram of the present invention when the second ejector rod is ejected into place. DETAILED DESCRIPTION

[0014] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0015] As shown in the figure, a stuck detection device for a fully automatic indexing chuck includes a stuck detection oil circuit arranged inside the indexing chuck and a hydraulic cylinder 2 arranged outside the indexing chuck. The stuck detection oil circuit includes a two-position four-way hydraulic control valve 1. The two-position four-way hydraulic control valve 1 has two working positions and four working oil ports. The two working positions are a first working position 11 and a second working position 12. The four working oil ports are a first working oil port A, a second working oil port B, a third working oil port C and a fourth working oil port D. The first working oil port A and the second working oil port B are connected, and the third working oil port C is connected to the fourth working oil port D. The first working position 11 is controlled by the ejection oil circuit 3 of the first ejector 5 arranged in the indexing chuck, and the second working position 12 is controlled by the reset spring 4. The interior of the indexing chuck is provided with a first ejector guide cavity 51 for the movement of the first ejector 5 and a second ejector guide cavity 61 for the movement of the second ejector 6. The first ejector guide cavity 51 is provided on the A first ejection in-position detection port 52 connected to the first ejection rod guide cavity 51 is provided corresponding to the fully ejected position of the first ejector rod 5, and a second ejection in-position detection port 62 connected to the second ejector rod guide cavity 61 is provided on the second ejector rod guide cavity 61 corresponding to the fully ejected position of the second ejector rod 6. A first detection channel 7, a second detection channel 8 and a third detection channel 9 are provided in the indexing chuck. The first detection channel 7 is provided between the first ejector rod guide cavity 51 and the two-position four-way hydraulic control valve 1, and a first end of the first detection channel 7 is connected to the first ejection in-position detection port 52, the second detection channel 8 is provided between the second ejector rod guide cavity 61 and the two-position four-way hydraulic control valve 1, and a first end of the second detection channel 8 is connected to the second ejection in-position detection port 62, the third detection channel 9 is provided between the two-position four-way hydraulic control valve 1 and the hydraulic cylinder 2, and a first end of the third detection channel 9 is connected to the rodless cavity 21 of the hydraulic cylinder 2.

[0016] In this specific embodiment, the hydraulic cylinder 2 has a stroke detection mechanism for detecting the ejection stroke of the hydraulic cylinder 2. The stroke detection mechanism can more accurately monitor whether the hydraulic cylinder 2 is ejected, thereby improving the accuracy of the detection.

[0017] In this embodiment, the stroke detection mechanism is a proximity switch 110 located behind the extended end of the piston rod 21 of the hydraulic cylinder 2. This mechanism offers a simple structure and stable detection. The mechanism is simple, low-cost, and provides stable and accurate detection.

[0018] In this embodiment, the proximity switch 110 is electrically connected to an external PLC processor 10. Since each machine tool's built-in PLC is different, the external PLC processor 10 forms an independent module. The machine tool only needs to be equipped with a corresponding alarm device, and the external PLC processor 10 is connected to the alarm device. This eliminates the need for machine tool modifications, saves time, and reduces the risk of failure.

[0019] The specific principle is: the first push rod 5 is pushed out, and the push-out oil circuit 3 is under high pressure, which drives the two-position four-way hydraulic control valve 1 to move in the direction of the return spring 4. When the first push rod 5 is pushed out into place, the second end of the first detection channel 7 is connected to the first working oil port A, and the second end of the third detection channel 9 is connected to the third working oil port C. At this time, the hydraulic cylinder 2 can be pushed out normally, and the proximity switch 110 detects the piston rod 21 of the hydraulic cylinder 2 and sends a signal to the PLC processor 10. At this time, the first push rod 5 is in a non-stuck state, and the alarm device on the machine tool does not work; and when the first push rod 5 is not pushed out into place, the second end of the first detection channel 7 cannot be connected to the first working oil port A, and the second end of the third detection channel 9 cannot be connected to the third working oil port C. At this time, the hydraulic cylinder 2 cannot be pushed out, and the proximity switch 110 cannot detect the piston rod 21 of the hydraulic cylinder 2. At this time, no signal is transmitted from the proximity switch 110 to the PLC processor 10, the first push rod 5 is in a stuck state, and the alarm device on the machine tool issues a stuck alarm; the first push rod 5 retracts , the second push rod 6 is pushed out, and the push-out oil circuit 3 is in a zero pressure state. Driven by the return spring 4, the two-position four-way hydraulic control valve 1 moves toward the first working position 11. When the second push rod 6 is pushed out into place, the second end of the second detection channel 8 is connected to the second working oil port B, and the second end of the third detection channel 9 is connected to the fourth working oil port D. At this time, the hydraulic cylinder 2 can be pushed out normally, and the proximity switch 110 detects the piston rod 21 of the hydraulic cylinder 2 and sends a signal to the PLC processor 10. At this time, the second push rod 6 is in a non-stuck state, and the alarm device on the machine tool does not work; and when the second push rod 6 is not pushed out into place, the second end of the second detection channel 8 cannot be connected to the second working oil port B, and the second end of the third detection channel 9 cannot be connected to the fourth working oil port D. At this time, the hydraulic cylinder 2 cannot be pushed out, the proximity switch 110 cannot detect the piston rod 21 of the hydraulic cylinder 2, and at this time, the proximity switch 110 transmits no signal to the PLC processor 10, the second push rod 6 is in a stuck state, and the alarm device on the machine tool issues a stuck alarm.

Claims

1. A fully automatic indexing chuck stuck detection device, characterized in that The camshaft is connected to the hydraulic cylinder to control the hydraulic pressure of ... a first ejection in-position detection port communicated with the first ejector rod guide cavity, a second ejection in-position detection port communicated with the second ejector rod guide cavity is provided on the second ejector rod guide cavity corresponding to the fully ejected position of the second ejector rod, a first detection channel, a second detection channel and a third detection channel are provided in the indexing chuck, the first detection channel is provided between the first ejector rod guide cavity and the two-position four-way hydraulic control valve, and a first end of the first detection channel is connected to the first ejection in-position detection port, the second detection channel is provided between the second ejector rod guide cavity and the two-position four-way hydraulic control valve, and a first end of the second detection channel is connected to the second ejection in-position detection port, the third detection channel is provided between the two-position four-way hydraulic control valve and the hydraulic cylinder, and a first end of the third detection channel is communicated with the rodless cavity of the hydraulic cylinder; The first push rod is pushed out, and the push-out oil circuit is under high pressure, driving the two-position four-way hydraulic control valve to move in the direction of the return spring. When the first push rod is pushed out into place, the second end of the first detection channel is connected to the first working oil port, and the second end of the third detection channel is connected to the second working oil port. At this time, the hydraulic cylinder can be pushed out normally, indicating that the first push rod is in a non-stuck state; the first push rod is retracted, and the second push rod is pushed out, and the push-out oil circuit is in a zero pressure state. Driven by the return spring, the two-position four-way hydraulic control valve moves toward the first working position. When the second push rod is pushed out into place, the second end of the second detection channel is connected to the third working oil port, and the second end of the third detection channel is connected to the fourth working oil port. At this time, the hydraulic cylinder can be pushed out normally, indicating that the second push rod is in a non-stuck state.

2. A fully automatic indexing chuck stuck detection device as claimed in claim 1, characterized in that The hydraulic oil cylinder has a stroke detection mechanism for detecting the ejection stroke of the hydraulic oil cylinder.

3. A fully automatic indexing chuck stuck detection device as claimed in claim 2, characterized in that The stroke detection mechanism is a proximity switch arranged behind the extended end of the piston rod of the hydraulic cylinder.

4. A fully automatic indexing chuck stuck detection device as claimed in claim 3, characterized in that The proximity switch is connected to an external PLC processor via an electrical signal.

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