Measuring device for on-line active measurement of height of cam shaft cam for grinding machine

Abstract

The invention belongs to the technical field of grinding machine active measuring devices, and relates to a measuring device for on-line active measurement of the height of a cam shaft cam for a grinding machine. The measuring device is provided with a shell with an opening in one end, and a shell cover is arranged at the opening end of the shell; a bottom plate is arranged in the shell; a fixing plate is also arranged in the shell; the fixing plate is located above one side of the bottom plate, and a supporting column is arranged between the fixing plate and the bottom plate. Movable rods are arranged above and below the supporting columns; rotating shafts are arranged on the two movable rods in a sleeving manner; one end of the rotating shaft penetrates through the bottom plate and the shell and is provided with adapters on the rotating shaft extending out of the shell, so that a lever structure taking the rotating shaft as a fulcrum is formed; the ends of the two switching rods are respectively provided with corresponding measuring rod measuring bodies; the measuring rod and the measuring piece are in contact with a workpiece, and the rear ends of the two movable rods are connected with the two corresponding displacement sensors respectively. The method can be widely applied to a large-batch processing production process; and the blank of online active measurement in the cam height processing process of the cam shaft is filled.

Description

Technical Field

[0001] The invention belongs to the technical field of active measuring devices for grinders, and relates to a measuring device for a grinder for actively measuring the cam height of a camshaft on-line. Background Art

[0002] The camshaft is the core component of the engine. The cam height ensures that the engine controls the opening and closing timing of the valve in the cylinder according to a certain rule. The accuracy of the camshaft cam height is one of the most important parameters affecting the working accuracy of the cam mechanism, and is also one of the important indicators affecting the engine performance. Therefore, it is very important to accurately measure and control the tolerance of the camshaft cam height during processing. However, there is currently no online active measurement of the camshaft cam height during the production process. The methods commonly used to detect the cam height are all post-processing measurements. For example, if an outside micrometer is used for measurement, the measurement accuracy is low and the measurement accuracy depends on the worker's experience, and the quality control is not very stable; if a height gauge is used for measurement, the accuracy is higher, but calibration is required and the measurement speed is slow; if a three-coordinate measuring machine, optical projector, camshaft measuring instrument and other detection devices are used, the accuracy is relatively high, but the equipment cost is high, the detection time is long, and the required production efficiency cannot be achieved during mass production. In addition, during the processing, with the continuous grinding process, the grinding wheel and other tools will be worn continuously, and the amount of wear is unknown, which brings certain errors to the processing accuracy and makes the quality of the workpiece product unstable; if the grinding wheel is frequently repaired during the processing, although it will improve the processing quality, it will greatly reduce the processing efficiency.

[0003] At the same time, as the market's requirements for the precision of machined parts increase, active measuring instruments are increasingly used in automated control equipment. During the entire workpiece processing process, active measuring instruments continuously measure the workpiece dimensions with high precision, and send signals to control the machine tool movements according to the size changes, thereby realizing the detection and control of the processing dimensions. During the processing process, there is no need to stop the machine, and no manual operation or manual reading of dimensional data is required, which greatly improves production efficiency, reduces labor intensity, does not require professional technical workers, and reduces scrap rate. It is widely used in relative dimension measurement in large-scale processing and production processes. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a measuring device for a grinder for actively measuring the cam height of a camshaft on-line.

[0005] The present invention adopts the following technical solutions to achieve the above-mentioned purpose: A measuring device for actively measuring the cam height of a camshaft on a grinding machine, the measuring device comprising a shell with an opening at one end, and a shell cover is provided at the open end of the shell; a bottom plate is provided in the shell; a fixing plate is also provided in the shell; the fixing plate is located above one side of the bottom plate, a pillar is provided between the fixing plate and the bottom plate, and the fixing plate and the bottom plate are supported by the pillar; movable rods are provided above and below the pillars, and the two movable rods are provided in parallel; rotating shafts are sleeved on the two movable rods; bearings are sleeved at both ends of the rotating shaft, and the bearing at one end is fixed to the bottom plate, and the bearing at the other end is fixed to the bottom plate. The bearing is fixed on the fixed plate; the movable rod is mounted between the fixed plate and the bottom plate; one end of the rotating shaft passes through the bottom plate and the shell and extends out of the shell, and a transfer rod is respectively arranged on the rotating shaft extending out of the shell; the movable rod, the rotating shaft and the transfer rod are integrated; the integrated movable rod, the rotating shaft and the transfer rod rotate with the rotating shaft to form a lever structure with the rotating shaft as the fulcrum; the ends of the two transfer rods are respectively installed with corresponding measuring rods and probes; a space for placing the workpiece to be measured is formed between the two measuring rods and probes; the measuring rod and probe are in contact with the workpiece, and the rear ends of the two movable rods are respectively connected to the two corresponding positions The two displacement sensors are connected, and the two displacement sensors are fixed on the bottom plate; during measurement, the data measured by the measuring rod and the probe are transmitted to the displacement sensor through a lever structure formed by a rotating shaft as a fulcrum; the upper end surface and the lower end surface of the upper movable rod of the two movable rods are respectively provided with a limit component a and a limit component b, and the upper end surface of the upper movable rod is in contact with the limit component a in the initial state, and the distance between the limit component b and the limit component a is used to limit the swing of the movable rod within a small range of 1.5°. Through the lever structure, the opening amount of the front end of the measuring rod and the probe at this end is 3mm, and the measuring rod at this end is measured. The sub-measurement tool measures the apex of the cam of the camshaft of the workpiece; the limiting component a and the limiting component b are fixed on the base plate; the upper end face and the lower end face of the movable rod below are respectively provided with a limiting component c and a limiting component d, and in the initial state, the lower end face of the movable rod below is in contact with the limiting component d, and the distance between the limiting component d and the limiting component c is used to limit the swing of the movable rod within a large range of 6°. Through the lever structure, the corresponding front end opening amount of the measuring rod probe below is 12 mm, and the measuring rod probe at this end measures the lowest point of the base circle of the cam of the workpiece camshaft; the limiting component c and the limiting component d are fixed on the base plate.

[0006] The lower end surface of the upper movable rod is also provided with a compression spring, which plays a role in restoring and applying pressure to the corresponding lever mechanism during the swinging and measuring process; the other end of the compression spring is fixed to the bottom plate through a fixing frame.

[0007] A constant force spring is also provided on the lower end surface of the movable rod below, which applies constant pressure and reset action to the corresponding lever mechanism during the swinging and measuring process, ensuring that the force at the contact point between the measuring rod, the measuring piece and the cam is always constant; the fixed end of the constant force spring is fixed on the bottom plate, and the free end is fixed on the movable rod below.

[0008] A sealing member is provided between the rotating shaft and the shell, and the interior of the shell is a sealed container.

[0009] The limiting components a, b, c and d all adopt a structure of a combination of standard hexagonal flat-end set screws and nuts and are installed in the threaded holes of the corresponding raised blocks on the bottom plate to limit the two movable rods respectively.

[0010] The present invention proposes a measuring device for online active measurement of cam height of camshaft for a grinding machine. Due to the characteristics of the cam, when the cam vertex rotates to the measuring rod probe below, the measuring rod probe here must have a sufficiently large opening amount for transition rotation of the cam vertex. Usually, this opening amount is large and related to the cam lift, while the opening amount required at the upper measuring rod probe is only related to the machining allowance, and usually does not exceed 0.5mm at most. In addition, according to the rotation direction of the workpiece during actual machining, a lever structure with a large opening amount is arranged below the measuring device of the present invention. When the cam vertex rotates to the measuring rod probe below, due to the large opening amount required for rotation transition, it can transition from the inner end of the measuring rod probe below, which can reduce the risk of collision between the cam vertex and the measuring rod probe. Therefore, the present invention adopts the above-mentioned structural arrangement. In the present invention, the integrated movable rod, rotating shaft and transfer rod rotate with the corresponding rotating shaft to form a lever structure with the rotating shaft as the fulcrum; a constant force spring is arranged on the movable rod located at the bottom; the constant force spring can effectively ensure that the reverse reset force of the movable rod does not increase with the increase of displacement during the large-range swinging process by designing the required force in advance, but is always a constant force, thereby ensuring that no matter how the opening amount of the measuring rod and the measuring member corresponding to the front end of the lever changes during the measurement process, the force at the contact point between the measuring rod and the measuring member and the cam is always a constant force of 1.5±0.1N, which can ensure the force required for online active measurement without scratching the workpiece; the movable rod located at the top only needs a smaller opening amount, and the compression spring at the rear end of the corresponding movable rod almost moves slightly during online active measurement, so the factors that will produce variable force can be ignored, so a compression spring can be used.

[0011] The present invention proposes a measuring device for online active measurement of camshaft cam height for a grinding machine. The above technical solution can be used to continuously and actively measure the workpiece size online with high precision during the entire machining process of the camshaft cam height, and send a signal to control the movement of the machine tool according to the change in size, thereby realizing the detection and control of the machining size. The resolution of the device can be as high as 0.1μm, and the repeatability can be as high as within 1μm. It can be used in large-scale machining production processes, which can not only ensure the accuracy of the workpiece, but also ensure the consistency of the workpiece quality, improve the measurability of the workpiece on site in the workshop, facilitate offline quality inspection, and reduce The labor of quality inspection after processing is reduced; the device is used for the whole processing process of the shaft workpiece with taper, without stopping the machine, manual operation and manual reading of dimension data, which greatly improves the production efficiency, reduces the labor intensity, does not require professional technical workers, reduces the difficulty of operation, and also reduces the scrap rate; in addition, after the workpiece is clamped and before processing, the measuring device of the present invention can also be used to detect the high point of the workpiece, and assist the machine tool to determine the angle of the workpiece through the high point; therefore, the measuring device of the present invention for the online active measurement of the cam height of the camshaft for a grinding machine can be widely used in large-scale processing and production processes; In addition, this invention also fills the gap in online active measurement of cam height during camshaft machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The schematic diagram of the structure of the present invention is shown in FIG. 1 with the shell cover removed.

[0013] Figure 2 for Figure 1 AA section view.

[0014] Figure 3 for Figure 1 Remove the top view of the workpiece.

[0015] Figure 4 This is a schematic diagram of the measuring state of the present invention (with the shell cover removed).

[0016] Figure 5 This is a schematic diagram of the cam rotation state without measurement in the present invention (with the shell cover removed).

[0017] In the figure: 1 workpiece; 2 measuring rod and measuring element; 3 adapter rod; 4 housing; 5 fixed plate; 6 bottom plate; 7 movable rod; 8 compression spring; 9 limit component a; 10 displacement sensor; 11 limit component b; 12 limit component c; 13 constant force spring; 14 limit component d; 15 rotating shaft; 16 sealing element; 17 bearing; 18 support; 19 housing cover. DETAILED DESCRIPTION

[0018] The present invention is described in detail with reference to the accompanying drawings and specific embodiments; like Figure 1 , Figure 2 , Figure 3 As shown, a measuring device for actively measuring the cam height of a camshaft on a grinding machine is provided. The measuring device has a shell 4 with an opening at one end, and a shell cover 19 is provided at the open end of the shell 4; a bottom plate 6 is provided in the shell 4; a fixing plate 5 is also provided in the shell 4; the fixing plate 5 is located above one side of the bottom plate 6, a pillar 18 is provided between the fixing plate 5 and the bottom plate 6, and the fixing plate 5 and the bottom plate 6 are supported by the pillar 18; movable rods 7 are provided above and below the pillar 18, and the two movable rods 7 are provided in parallel; a rotating shaft 15 is sleeved on the two movable rods 7; bearings 17 are sleeved at both ends of the rotating shaft 15, and the bearing 17 at one end is fixed to the The bottom plate 6 is provided with a bearing 17 at the other end thereof, and the bearing 17 at the other end thereof is fixed on the fixed plate 5; the movable rod 7 is mounted between the fixed plate 5 and the bottom plate 6; one end of the rotating shaft 15 passes through the bottom plate 6 and the shell 4 and extends to the outside of the shell 4, and a transfer rod 3 is respectively arranged on the rotating shaft extending out of the shell 4; the movable rod 7, the rotating shaft 15 and the transfer rod 3 are integrated; the integral movable rod 7, the rotating shaft 15 and the transfer rod 3 rotate with the rotating shaft 15 to form a lever structure with the rotating shaft 15 as a fulcrum; the ends of the two transfer rods 3 are respectively installed with corresponding measuring rods and measuring devices 2; a space for placing the workpiece 1 to be measured is formed between the two measuring rods and measuring devices 2; the measuring rod and measuring device 2 are in contact with the workpiece 1, and the two movable rods and measuring devices ... The rear ends of the rod 7 are respectively connected to two corresponding displacement sensors 10, and the two displacement sensors 10 are fixed on the base plate 6; during measurement, the data measured by the measuring rod and probe 2 are transmitted to the displacement sensor 10 through a lever structure formed with the rotating shaft 15 as a fulcrum; the upper end face and the lower end face of the upper movable rod 7 of the two movable rods 7 are respectively provided with a limiting component a9 and a limiting component b11, and in the initial state, the upper end face of the upper movable rod is in contact with the limiting component a9, and the distance between the limiting component b11 and the limiting component a9 is used to limit the swing of the movable rod within a small range of 1.5°, and through the lever structure, the opening amount of the front end of the corresponding upper measuring rod and probe 2 is 3m m, the measuring rod and probe 2 at this end measures the apex of the camshaft cam of the workpiece 1; the limiting component a9 and the limiting component b11 are fixed on the base plate 6; the upper end face and the lower end face of the movable rod 7 located below are respectively provided with a limiting component c12 and a limiting component d14, and the lower end face of the movable rod below is in the initial state, and its lower end face is in contact with the limiting component d, and the distance between the limiting component d and the limiting component c is used to limit the movable rod to swing through the lever structure within a large range of 6°, and the corresponding front end opening amount of the measuring rod and probe 2 below is 12mm, and the measuring rod and probe 2 at this end measures the lowest point of the base circle of the camshaft cam of the workpiece 1; the limiting component c12 and the limiting component d14 are fixed on the base plate 6.

[0019] A compression spring 8 is also provided on the lower end surface of the movable rod 7 above, which plays a role in restoring and applying pressure to the corresponding lever mechanism during the swinging and measuring process; the other end of the compression spring 8 is fixed to the bottom plate 6 through a fixing frame.

[0020] A constant force spring 13 is also provided on the lower end surface of the movable rod 7 below, which plays a role in restoring and applying pressure to the corresponding lever mechanism during the swinging and measuring process; the fixed end of the constant force spring 13 is fixed on the base plate 6, and the free end is fixed on the movable rod 7 below.

[0021] A sealing member 16 is provided between the rotating shaft 15 and the housing 4, and the interior of the housing 4 is a sealed container; The limiting components a9, b11, c12 and d14 all adopt a structure of a combination of standard hexagonal flat-end set screws and nuts and are installed in the threaded holes of the corresponding raised blocks on the base plate 6 to limit the two movable rods 7 respectively.

[0022] Combination Figure 4 , Figure 5 Due to the characteristics of the cam, when the cam apex rotates to the measuring rod probe 2 below, the measuring rod probe 2 here must have a sufficiently large opening amount for the transition rotation of the cam apex. Usually, this opening amount is large and related to the cam lift, while the opening amount required at the upper measuring rod probe 2 is only related to the machining allowance, and usually does not exceed 0.5mm at most. In addition, according to the rotation direction of the workpiece during actual machining, a lever structure with a large opening amount is arranged below the measuring device of the present invention. When the cam apex rotates to the measuring rod probe 2 below, due to the large opening amount required for the rotation transition, it can transition from the inner end of the measuring rod probe 2 below, thereby reducing the risk of collision between the cam apex and the measuring rod probe 2.

[0023] The integrated movable rod 7, rotating shaft 15 and transfer rod 3 rotate with the corresponding rotating shaft 15 to form a lever structure with the rotating shaft 15 as the fulcrum; a constant force spring 13 is arranged on the movable rod 7 located at the bottom; the constant force spring 13 can effectively ensure that the reverse reset force of the movable rod 7 does not increase with the increase of the displacement during the large-range swinging process by designing the required force in advance, but is always a constant force, thereby ensuring that the measuring rod and probe 2 corresponding to the front end of the lever changes no matter how the opening amount changes during the measurement process, the force at the contact point between the measuring rod and probe 2 and the cam of the workpiece 1 is always a constant force of 1.5±0.1N, which can not only ensure the force required for online active measurement, but also will not scratch the workpiece; the movable rod 7 located at the top only needs a smaller opening amount, and the compression spring 8 at the rear end of the corresponding movable rod is almost slightly moved during online active measurement, so the factors that will produce variable force can be ignored, so the compression spring 8 can be used.

Claims

1. A measuring device for actively measuring the cam height of a camshaft on a grinding machine, the measuring device comprising a shell with an opening at one end, and a shell cover is provided at the open end of the shell; a bottom plate is provided in the shell; a fixing plate is also provided in the shell; the fixing plate is located above one side of the bottom plate, a pillar is provided between the fixing plate and the bottom plate, and the fixing plate and the bottom plate are supported by the pillar; movable rods are provided above and below the pillars, and the two movable rods are provided in parallel; a rotating shaft is sleeved on the two movable rods; bearings are sleeved at both ends of the rotating shaft, and one end of the bearing is fixed to the bottom plate, and the other end is fixed to the bottom plate. The end bearing is fixed on the fixed plate; the movable rod is mounted between the fixed plate and the bottom plate; one end of the rotating shaft passes through the bottom plate and the shell and extends out of the shell, and a transfer rod is respectively arranged on the rotating shaft extending out of the shell; the movable rod, the rotating shaft and the transfer rod are integrated; the integrated movable rod, the rotating shaft and the transfer rod rotate with the rotating shaft to form a lever structure with the rotating shaft as the fulcrum; the ends of the two transfer rods are respectively installed with corresponding measuring rods and probes; a space for placing the workpiece to be measured is formed between the two measuring rods and probes; the measuring rod and probe are in contact with the workpiece, and the rear ends of the two movable rods are respectively connected to the two corresponding The two movable rods are connected to each other, and two of the displacement sensors are fixed on the bottom plate; during measurement, the data measured by the measuring rod and the probe are transmitted to the displacement sensor through a lever structure formed by a rotating shaft as a fulcrum; the upper end surface and the lower end surface of the movable rod located at the top of the two movable rods are respectively provided with a limit component a and a limit component b, and in the initial state, the upper end surface of the movable rod above is in contact with the limit component a, and the distance between the limit component b and the limit component a is used to limit the swing of the movable rod within a small range of 1.5°. Through the lever structure, the opening amount of the front end of the measuring rod and the probe at this end is 3mm, and the measuring rod at this end is The sub-measurement tool measures the apex of the cam of the camshaft of the workpiece; the limiting component a and the limiting component b are fixed on the base plate; the upper end face and the lower end face of the movable rod below are respectively provided with a limiting component c and a limiting component d, and in the initial state, the lower end face of the movable rod below is in contact with the limiting component d, and the distance between the limiting component d and the limiting component c is used to limit the swing of the movable rod within a large range of 6°. Through the lever structure, the corresponding front end opening amount of the measuring rod probe below is 12 mm, and the measuring rod probe at this end measures the lowest point of the base circle of the cam of the workpiece camshaft; the limiting component c and the limiting component d are fixed on the base plate.

2. A measuring device for online active measurement of cam height of a camshaft for a grinding machine according to claim 1, characterized in that: A constant force spring is also provided on the lower end surface of the movable rod below, which applies constant pressure and reset action to the corresponding lever mechanism during the swinging and measuring process, ensuring that the force at the contact point between the measuring rod, the measuring piece and the cam is always constant; the fixed end of the constant force spring is fixed on the bottom plate, and the free end is fixed on the movable rod below.

3. The measuring device for online active measurement of cam height of a camshaft for a grinding machine according to claim 1, characterized in that: The lower end surface of the movable rod above is also provided with a compression spring, which plays a role in restoring and applying pressure to the corresponding lever mechanism during the swinging and measuring process; the other end of the compression spring is fixed to the bottom plate through a fixing frame.

4. The measuring device for online active measurement of cam height of a camshaft for a grinding machine according to claim 1, characterized in that: A sealing member is provided between the rotating shaft and the shell, and the interior of the shell is a sealed container.

5. The measuring device for online active measurement of cam height of a camshaft for a grinding machine according to claim 1, characterized in that: The limiting components a, b, c and d all adopt a structure of a combination of standard hexagonal flat-end set screws and nuts and are installed in the threaded holes of the corresponding raised blocks on the bottom plate to limit the two movable rods respectively.

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