CN102601635A - Electromechanical and hydraulic integrated pressure equalization clamping device - Google Patents

Abstract

An electromechanical and hydraulic integrated pressure equalization clamping device comprises a driving device, a transmission, a hinge rod mechanism and a clamping mechanism. The electromechanical and hydraulic integrated pressure equalization clamping device is characterized in that the transmission consists of a coupler, one end of the coupler is connected with an output end of the driving device, the other end of the coupler is connected with a sliding lead screw, a nut is disposed on the sliding lead screw, the hinge rod mechanism comprises primary hinge rods and secondary hinge rods which are symmetrically arranged on two sides of the nut, one end of each primary hinge rod is hinged with the nut, the other end of each primary hinge rod is hinged with one end of each of the two corresponding secondary hinge rods, the other end of one of the two secondary hinge rods on each side of the nut is hinged with a fulcrum, the other end of the other one of the two secondary hinge rods on each side of the nut is hinged with the clamping mechanism, the clamping mechanism comprises a slider hinged with the secondary hinge rods, a hydraulic cavity is disposed in the slider, floating media are filled in the hydraulic cavity, at least two plunger clamping parts are disposed on the slider, and inner ends of the plunger clamping parts are abutted to the hydraulic cavity. The electromechanical and hydraulic integrated pressure equalization clamping device is simple in structure, convenient in use and fine in clamping effect and is energy-saving and environment-friendly.

Description

An electromechanical-hydraulic integrated pressure equalizing clamping device

technical field

The invention relates to a clamping device, in particular to an electromechanical-hydraulic integrated pressure equalizing clamping device.

Background technique

Whether it is traditional machinery manufacturing or modern machinery manufacturing, the role of machine tool fixtures is very important. The core of the machine tool fixture is the clamping device.

In actual engineering use, it is often encountered that workpieces with uneven surfaces need to be clamped, or multiple workpieces need to be clamped at the same time. At this time, the traditional planar clamping device cannot meet the requirements. In the precision machining process, in order to reduce the contact stress between the clamping element and the surface of the workpiece to be clamped, it is especially necessary to use a multi-point equalizing clamping device.

The traditional pressure equalizing clamping device generally uses multi-stage series levers to realize multi-point and multi-position clamping, but in this way, the mechanism used is very complicated, the structure is not compact, and the rigidity is not good enough. From the classification of the power source of the clamping device, it can generally be divided into three categories: hydraulic, pneumatic and manual. Multi-point or multi-position machine tool fixtures generally require a large clamping force. Usually, people are often forced to use hydraulic clamping devices, but hydraulic transmission is very easy to cause air, ground and other surrounding environmental pollution due to hydraulic oil volatilization and leakage. . Pneumatic transmission also has its own obvious shortcomings that cannot be overcome, because the gas is extremely easy to leak, so the working pressure of the pneumatic transmission system cannot be very high. At present, in the field of engineering, the system pressure of pneumatic transmission is generally in the range of p _A = 0.4 ~ _0.7MPa . Such a low system working pressure will often cause the diameter of the pneumatic cylinder and the size of the entire device to be reduced when the output force is required to be large. The size is unacceptably large. However, the manual pressure equalizing fixture cannot realize the automatic control of the clamping force, and has great limitations.

Contents of the invention

The object of the present invention is to provide an electromechanical-hydraulic integrated pressure equalizing clamping device with simple structure, convenient use, good clamping effect, energy saving and environmental protection.

In order to achieve the above object, the technical solution adopted in the present invention is: an electromechanical-hydraulic integrated pressure equalizing clamping device, including a driving device, a transmission device, a hinge mechanism and a clamping mechanism, and the transmission device includes one end connected to the drive A coupling connected to the output end of the device, the other end of the coupling is connected to a sliding screw, and a nut is arranged on the sliding screw;

The hinge rod mechanism includes a primary hinge rod and a secondary hinge rod symmetrically arranged on both sides of the nut. One end of the primary hinge rod is hinged to the nut, and the other end is respectively hinged to one end of two secondary hinge rods, one of which is The other end of the secondary hinge rod is hinged to the fulcrum, and the other end of the other secondary hinge rod is hinged to the clamping mechanism;

The clamping mechanism includes a slider hinged with the secondary hinge rod, a hydraulic cavity is opened in the slider, and hydraulic oil is filled in the slider, and at least two plunger clamping parts are arranged on the slider , the inner end of the plunger clamping part interferes with the hydraulic chamber.

In a further technical solution, a pressure switch is connected to the hydraulic chamber.

In a further technical solution, the driving device is a servo motor.

In a further technical solution, the floating medium is hydraulic oil.

In the above technical solution, the servo motor is used as the power source, and the power output end of the servo motor is connected to the sliding screw rod through a coupling, and the rotation of the servo motor is converted into the linear motion of the nut on the sliding screw rod by the sliding screw drive, and the nut's Sliding up and down, the force is amplified by the primary hinge rod and the secondary hinge rod, and then output through the slider. The inside of the slider is a closed hydraulic chamber, which is filled with hydraulic oil. Multiple plunger clamping parts and the hydraulic chamber contradict. When the clamping device is working, when one of the plunger clamps first touches the workpiece, the pressure can be transmitted to other plunger clamps through the floating medium hydraulic oil, pushing the plunger clamps to move downward , so as to make other plunger clamping parts contact and work, and achieve equal pressure clamping of the workpiece. Due to the floating effect of the hydraulic oil in the floating medium, it can ensure that the plunger clamping part is evenly pressed on the workpiece with the same force, or different workpieces are applied with the same force. Due to the high viscosity of the hydraulic oil in the floating medium, Therefore, no special sealing is required, so the device has a simple structure, and in actual use, multiple plunger clamping parts can be provided as required to meet the actual working conditions. In addition, a pressure switch is connected to the closed hydraulic chamber, which can dynamically detect the pressure and then control the servo motor.

In the above technical solution, the clamping device has a high degree of symmetry, and thus has good mechanical technical indicators. The calculation formula of the actual total output force F _op of the clamping device is:

为一级铰杆的当量摩擦角，

为二级铰杆的当量摩擦角，M是伺服电机的输出转矩，d₂是滑动丝杆的中径，λ是滑动丝杠的升角(可由

获得，其中L是导程)，

为滑动丝杠的当量摩擦角。In the formula, α and β are theoretical pressure angles,

is the equivalent friction angle of the primary hinge rod,

is the equivalent friction angle of the secondary hinge rod, M is the output torque of the servo motor, _d2 is the middle diameter of the sliding screw, and λ is the lift angle of the sliding screw (which can be determined by

obtained, where L is the lead),

is the equivalent friction angle of the sliding screw.

If there are n plunger clamps in the clamping device, the F _ope of each plunger clamp is:

Conditions for mechanism self-locking:

Due to the use of the above-mentioned technical solutions, the present invention has the following advantages compared with the prior art:

1. In the present invention, the servo motor is connected with the sliding screw rod through a coupling, and the sliding screw rod is provided with a nut, which is hinged with the nut and symmetrically arranged on both sides of the nut. The hinge rod mechanism is hinged with the slide block, and the servo motor is rotated It is the linear movement of the nut on the sliding screw rod, and then the force is amplified by the hinge rod, and then the output of the plunger clamping part on the slider realizes the equal pressure clamping of the workpiece. The structure is simple, easy to use, and the clamping Good tightening effect;

2. The invention can significantly reduce the rated power of the servo motor by amplifying the force through the primary and secondary hinge rod mechanisms;

3. The transmission mechanism of the present invention is driven by a screw, and self-locking is used in the cutting process after the workpiece is clamped, so that the clamping device no longer consumes energy, and the energy saving is remarkable;

4. There is a pressure switch connected to the hydraulic chamber, so that the clamping force can be indirectly measured and controlled dynamically, with a high degree of automation;

5. Due to the high viscosity of the hydraulic oil, after the hydraulic chamber is sealed, the whole device will not pollute the environment.

Description of drawings

Accompanying drawing 1 is the structure diagram of embodiment 1 of the present invention.

Among them: 1. Driving device; 2. Coupling; 3. Sliding screw rod; 4. Nut; 5. Primary hinge rod; 6. Secondary hinge rod; 7. Slider; 8. Hydraulic cavity; 9. Column Plug clamping parts; 10. Pressure switch

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Embodiment 1: Referring to Figure 1, an electromechanical-hydraulic integrated pressure equalizing clamping device includes a driving device 1, a transmission device, a hinge mechanism and a clamping mechanism, and the transmission device includes one end connected to the driving device 1 The shaft coupling 2 connected to the output end, the other end of the shaft coupling 2 is connected with a sliding screw 3, and the sliding screw 3 is provided with a nut 4; the hinge mechanism includes symmetrically arranged on both sides of the nut 4 One-stage hinge rod 5 and two-stage hinge rod 6, one end of said one-stage hinge rod 5 is hinged with nut 4, and the other end is respectively hinged with one end of two secondary hinge rods 6, wherein the other end of one secondary hinge rod 6 is connected with The fulcrum is hinged, and the other end of another secondary hinge rod 6 is hinged with the clamping mechanism; the clamping mechanism includes a slide block 7 hinged with the secondary hinge rod 6, and a hydraulic chamber is opened in the slide block 7 8, which is filled with floating medium, and the slider 7 is provided with at least two plunger clamping parts 9, the inner ends of the plunger clamping parts 9 conflict with the hydraulic chamber 8, and the hydraulic chamber 8 is connected with a pressure switch 10, the driving device 1 is a servo motor, and the floating medium is hydraulic oil.

When the clamping device is in operation, the power output end of the servo motor is connected with the sliding screw 3 through the coupling 2, and the rotation of the servo motor is converted into the linear motion of the nut 4 on the sliding screw by the sliding screw drive, and the movement of the nut 4 Sliding up and down, the force is amplified by the primary hinge rod 5 and the secondary hinge rod 6, and then output through the slider 7. The inside of the slider 7 is a closed hydraulic chamber 8, which is filled with hydraulic oil and clamped by multiple plungers. The inner end of the part 9 is in conflict with the hydraulic chamber 8. When one of the plunger clamping parts 9 touches the workpiece first, the pressure can be transmitted to other plunger clamping parts 9 through the floating medium hydraulic oil, and the plunger is pushed. The clamping part 9 moves downwards, thereby making other plunger clamping parts contact and work, realizing equal pressure clamping of the workpiece. Due to the floating effect of the floating medium hydraulic oil, it can ensure that the plunger clamping parts apply pressure evenly with the same force on the workpiece, or apply the same force to different workpieces.

Claims (4)

1. a mechanical-electrical-hydraulic integration is all pressed clamping device; Comprise drive unit (1), transmission device, toggle mechanism and clamp mechanism; It is characterized in that: said transmission device comprises the shaft coupling (2) that an end is connected with said drive unit (1) output; Said shaft coupling (2) other end is connected with sliding screw (3), and said sliding screw (3) is provided with nut (4);

Said toggle mechanism comprises one-level toggle (5) and the secondary toggle (6) that is symmetricly set in nut (4) both sides; Said one-level toggle (5) one ends and nut (4) are hinged; The other end is hinged with an end of two secondary toggles (6) respectively; One of them secondary toggle (6) other end is with point articulated, and another secondary toggle (6) other end and said clamp mechanism are hinged;

Said clamp mechanism comprises the slide block (7) hinged with said secondary toggle (6); Offer hydraulic cavities (8) in the said slide block (7); Be filled with unsteady medium in it, said slide block (7) is provided with at least two plunger clamping elements (9), and said plunger clamping element (9) is inner conflicts with said hydraulic cavities (8).

2. a kind of mechanical-electrical-hydraulic integration according to claim 1 is all pressed clamping device, it is characterized in that: be connected with pressure switch (10) with said hydraulic cavities (8).

3. a kind of mechanical-electrical-hydraulic integration according to claim 1 is all pressed clamping device, it is characterized in that: said drive unit (1) is a servomotor.

4. a kind of mechanical-electrical-hydraulic integration according to claim 1 is all pressed clamping device, it is characterized in that: said unsteady medium is a hydraulic oil.

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