Tool unloading detection structure for main shaft broaching tool

Abstract

The utility model discloses a spindle broach unloading detection structure, which relates to the technical field of processing cutters, and comprises a shaft body, a pull rod, an end cover and a connecting rod which form an oil cylinder, a stepped hole is arranged in the shaft body, the pull rod and a broach assembly are arranged in the stepped hole, the pull rod is further sleeved with an elastic element group, and the elastic element group is connected with the end cover. An end cover is installed at the end of the shaft body, a connecting rod is further connected to one side of the shaft body, a main shaft fixing component is installed outside the connecting rod, a hydraulic oil conveying hole is formed in the connecting rod, and a plurality of rotary sealing pieces are designed on the cylindrical face, rotationally matched with the connecting rod, of the end cover. The precise gear flow meter is used for accurately metering the flow of hydraulic oil entering and exiting the oil cylinder, the stroke of the piston (namely the pull rod) is calculated, and the clamping state of the cutter handle is indirectly judged. The detection method can support the design of greatly shortening the axial size of the loose broach structure, support the integrated oil cylinder in the shaft, and simplify the mechanical structure design.

Description

Technical Field

[0001] The utility model relates to the technical field of machining tools, in particular to a spindle broach tool unloading detection structure. Background Art

[0002] A tool holder clamping mechanism usually needs to be provided with a mechanism for detecting the state of the tool holder, so that the machine can identify whether the spindle is in the state of tool holder clamping, tool holder releasing or no tool holder clamping, which is used as an input variable for the machine to control the spindle. The tool holder detection mechanism needs to use proximity switches, ranging sensors, etc. to detect a target installed on the tool holder clamping mechanism and axially moving along with the drawbar. Therefore, such a structure needs to reserve enough space axially for the installation of the target and the sensor. Thus, a spindle broach tool unloading detection structure is proposed here. Content of the Utility Model

[0003] Technical Problem to be Solved

[0004] The purpose of the utility model is to make up for the deficiencies of the prior art and provide a spindle broach tool unloading detection structure.

[0005] Technical Solution

[0006] To achieve the above object, the present utility model provides the following technical solution: A spindle puller tool unloading detection structure, which includes a shaft body, a pull rod, an end cover and a connecting rod to form an oil cylinder. A stepped hole is provided inside the shaft body. A pull rod and a tool holder assembly are installed inside the stepped hole. An elastic element group is also sleeved on the pull rod. An end cover is installed at the end of the shaft body. A connecting rod is also connected to one side of the shaft body. A spindle fixing component is installed outside the connecting rod. A hydraulic oil delivery hole is provided inside the connecting rod. A number of rotary seals are designed on the cylindrical surface of the end cover that rotates in cooperation with the connecting rod. As shown in the figure, the tool pulling mechanism is in the tool holder clamping state, and hydraulic oil is injected into the connecting rod. The flow of the hydraulic oil drives the gear flowmeter to rotate and outputs a volume signal of the hydraulic oil flowing through. At the same time, under the push of the hydraulic oil, the pull rod overcomes the elastic force of the elastic element group and moves axially downward, thereby driving the tool holder assembly to release the tool holder until the tool holder is completely ejected. At this time, the signal output by the gear flowmeter corresponds to the tool unloading state of the tool pulling mechanism; on the contrary, when the hydraulic oil in the connecting rod is in a pressure release state, the pull rod moves axially upward under the elastic force of the elastic element group, causing the tool holder assembly to clamp the tool holder. At the same time, the hydraulic oil is squeezed out and drives the gear flowmeter to rotate in the reverse direction along the pipeline and outputs a volume signal of the hydraulic oil flowing through. Until the tool holder is completely clamped and the pull rod stops moving and the hydraulic oil also stops flowing, the signal output by the gear flowmeter at this time corresponds to the tool pulling state of the tool pulling mechanism. The present utility model uses a precision gear flowmeter to accurately measure the flow rate of the hydraulic oil entering and leaving the oil cylinder, calculates the stroke of the piston (i.e., the pull rod), and indirectly judges the clamping state of the tool holder. This detection method can support a significant reduction in the axial dimension design of the tool loosening and tightening structure, support the integration of the oil cylinder inside the shaft, and simplify the mechanical structure design.

[0007] Preferably, the connecting rod is connected to an external hydraulic oil supply source, and a gear flowmeter is connected in series in the connecting pipeline.

[0008] Preferably, the tool holder assembly is connected to a tool holder.

[0009] Preferably, the end cover can rotate around the connecting rod on the spindle fixing component along with the shaft body.

[0010] Preferably, the elastic element group is used to provide an axially upward pulling force required for clamping the tool holder by the tool holder assembly.

[0011] Advantageous effects:

[0012] Compared with the prior art, the spindle puller tool unloading detection structure has the following advantageous effects:

[0013] This utility model uses a precision gear flowmeter to accurately measure the flow rate of hydraulic oil entering and leaving the oil cylinder, calculates the stroke of the piston (i.e., the pull rod), and indirectly judges the clamping state of the tool holder. This detection method can support a significant reduction in the axial dimension design of the pull-back and pull-out tool structure, support the integration of the oil cylinder inside the shaft, and simplify the mechanical structure design. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of the present utility model in the pulled state.

[0016] In the figure:

[0017] 1. Shaft body; 2. Broach assembly; 3. Elastic element group; 4. Pull rod; 5. End cover; 6. Rotary seal; 7. Spindle fixing part; 8. Connecting rod; 9. Tool holder; 10. Gear flowmeter; 11. Hydraulic oil delivery hole 801. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0019] Please refer to Figure 1 As shown, the present utility model provides a technical solution: a spindle pull-back and pull-out tool detection structure, including a shaft body 1, a pull rod 4, an end cover 5 and a connecting rod 8 to form an oil cylinder, characterized in that: a stepped hole is provided inside the shaft body 1, a pull rod 4 and a broach assembly 2 are installed inside the stepped hole, an elastic element group 3 is also sleeved on the pull rod 4, an end cover 5 is installed at the end of the shaft body 1, a connecting rod 8 is also connected to one side of the shaft body 1, a spindle fixing part 7 is installed outside the connecting rod 8, a hydraulic oil delivery hole 801 is provided inside the connecting rod 8, and a plurality of rotary seals 6 are designed on the cylindrical surface of the end cover 5 that rotates in cooperation with the connecting rod 8. This utility model uses a precision gear flowmeter to accurately measure the flow rate of hydraulic oil entering and leaving the oil cylinder, calculates the stroke of the piston (i.e., the pull rod), and indirectly judges the clamping state of the tool holder. This detection method can support a significant reduction in the axial dimension design of the pull-back and pull-out tool structure, support the integration of the oil cylinder inside the shaft, and simplify the mechanical structure design.

[0020] The connecting rod 8 in this application is connected to an external hydraulic oil supply source, and a gear flowmeter 10 is connected in series in the connecting pipeline. The broach assembly 2 is connected to a tool holder 9. The end cover 5 can rotate around the connecting rod 8 on the main shaft fixing member 7 along with the shaft body 1. The elastic element group 3 is used to provide the axial upward pulling force required for clamping the tool holder by the broach assembly 2.

[0021] Working principle: As Figure 1 shown, when the broaching mechanism is in the tool holder clamping state, hydraulic oil is injected into the connecting rod 8. The flow of the hydraulic oil drives the gear flowmeter 10 to rotate and outputs the volume signal of the hydraulic oil flowing through. At the same time, under the push of the hydraulic oil, the pull rod 4 overcomes the elastic force of the elastic element group 3 and moves axially downward, thereby driving the broach assembly 2 to release the tool holder 9 until the tool holder 9 is completely pushed out. At this time, the signal output by the gear flowmeter 10 corresponds to the tool unloading state of the broaching mechanism; on the contrary, when the hydraulic oil in the connecting rod 8 is in a pressure release state, the pull rod 4 moves axially upward under the action of the elastic force of the elastic element group 3, so that the broach assembly clamps the tool holder 9. At the same time, the hydraulic oil is squeezed out and drives the gear flowmeter 10 to rotate in the reverse direction along the pipeline and outputs the volume signal of the hydraulic oil flowing through. Until the tool holder 9 is completely clamped and the pull rod 4 stops moving, the hydraulic oil also stops flowing. At this time, the signal output by the gear flowmeter 10 corresponds to the broaching state of the broaching mechanism.

[0022] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A spindle broach unloading detection structure, comprising a spindle body (1), a draw rod (4), an end cover (5) and a connecting rod (8) forming an oil cylinder, characterized in that: A connecting rod (8) is also connected to one side of the shaft body (1), a hydraulic oil delivery hole (801) is provided inside the connecting rod (8), the connecting rod (8) is connected to an external hydraulic oil supply source, and a gear flow meter (10) is connected in series in the connecting pipe between the hydraulic oil supply source and the connecting rod (8).

2. A spindle broach unloading detection structure according to claim 1, characterized in that: A stepped hole is provided inside the shaft body (1), a pull rod (4) and a broach assembly (2) are installed inside the stepped hole, and an end cover (5) is installed at the end of the shaft body (1).

3. A spindle broach unloading detection structure according to claim 2, characterized in that: The broach assembly (2) is connected to a handle (9).

4. A spindle broach unloading detection structure according to claim 1, characterized in that: A main shaft fixing component (7) is installed outside the connecting rod (8), and the end cover (5) can rotate around the connecting rod (8) on the main shaft fixing component (7) along with the shaft body (1).

5. The spindle broach unloading detection structure according to claim 1, characterized in that: The pull rod (4) is also sleeved with an elastic element group (3), and the elastic element group (3) is used to provide the broach assembly (2) with an axial upward pulling force required for clamping the tool handle.

6. A spindle broach unloading detection structure according to claim 1, characterized in that: The end cover (5) is designed with a plurality of rotating seals (6) on a cylindrical surface that is rotatably matched with the connecting rod (8).

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