A low-speed permanent magnet synchronous motor directly driven variable frequency speed regulation grinding equipment

Abstract

A low-speed permanent magnet synchronous motor directly driven variable frequency speed regulating grinding equipment, including grinding equipment, a low-speed permanent magnet synchronous motor driving the grinding cylinder of the grinding equipment to rotate, and a variable frequency speed regulating control system; the rotor of the motor is composed of a semicircular rotor upper lobe and a semicircular rotor lower lobe that can be matched to form a circular ring, the rotor is arranged between the end face and the end cover of the grinding cylinder, and the rotor is fixedly installed on the grinding cylinder through the roller connecting bolts; the stator of the motor is composed of a stator upper lobe and a stator lower lobe that can be matched to form a circular inner hole, the stator lower lobe is arranged in the base, and the ears on both sides are fixedly installed on the supporting platforms on both sides of the notch of the base; the stator is sleeved on the outer periphery of the rotor. The present invention has a simple structure, is safe and reliable, is easy to maintain, and saves operating costs.

Description

Technical Field

[0001] The invention belongs to the technical field of grinding equipment, and in particular relates to variable frequency speed regulating grinding equipment directly driven by a permanent magnet synchronous motor. Background Art

[0002] Traditional grinding equipment consists of motors, reducers, gears, and grinding equipment cylinders connected to each other through intermediate mechanical transmission parts. There are many transmission connectors, the structure is complex, the equipment operation reliability is not high, and the equipment operation speed cannot be adjusted. With the development of permanent magnet synchronous motors and variable frequency speed regulation technology, it is possible to use low-speed permanent magnet synchronous motors to directly drive the grinding equipment cylinder, simplify the structure of the grinding equipment, further improve the safety and reliability of the equipment operation, and reduce the equipment operation cost. Summary of the invention

[0003] The present invention aims to solve the deficiencies of the prior art and to provide a low-speed permanent magnet synchronous motor direct-driven variable frequency speed regulating grinding equipment which has a simple structure, is safe and reliable, is easy to maintain and saves operating costs.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A low-speed permanent magnet synchronous motor directly driven variable frequency speed regulating grinding equipment, comprising a grinding equipment, a low-speed permanent magnet synchronous motor driving a grinding cylinder of the grinding equipment to rotate, and a variable frequency speed regulating control system;

[0006] Both ends of the grinding cylinder of the grinding equipment are installed on the roller supports;

[0007] The rotor of the low-speed permanent magnet synchronous motor is composed of a semicircular rotor upper lobe and a semicircular rotor lower lobe that can be aligned to form a ring. The mating surfaces of the rotor upper lobe and the rotor lower lobe are respectively provided with extended overlapping edge strips, and the overlapping edge strips are provided with connecting holes. After the rotor upper lobe and the rotor lower lobe are aligned, the rotor upper lobe and the rotor lower lobe are fixedly connected by rotor connecting bolts passing through the connecting holes; the rotor is arranged between one end face of the grinding cylinder and the end cover, and the rotor is fixedly installed on the grinding cylinder by roller connecting bolts that pass through the edge of the end face of the grinding cylinder, the rotor and the edge of the end cover in a transverse direction;

[0008] The stator of the low-speed permanent magnet synchronous motor is composed of an upper stator lobe and a lower stator lobe that can be matched to form a circular inner hole. The matching surfaces of the upper stator lobe and the lower stator lobe are respectively provided with extended overlapping edge strips, and the overlapping edge strips are provided with connecting holes. After the upper stator lobe and the lower stator lobe are matched, the upper stator lobe and the lower stator lobe are fixedly connected by stator connecting bolts passing through the connecting holes; the shape of the lower stator lobe is a trapezoid with ears on both sides that gradually shrinks downward, and the lower stator lobe is arranged in an adapted base with a trapezoidal groove, and the ears on both sides are fixedly installed on the supporting platforms on both sides of the notch of the base; the stator is sleeved on the periphery of the rotor, and an air gap is provided between the stator and the rotor;

[0009] A temperature sensor for measuring the temperature inside the motor and a displacement sensor for measuring the air gap between the stator and the rotor of the motor are installed on the stator;

[0010] A forced cooling fan is installed above the low-speed permanent magnet synchronous motor.

[0011] Furthermore, the front and rear ends and outer ends of the supporting platform on both sides of the base slot are provided with vertical edges, and adjusting screws are installed on the vertical edges.

[0012] Compared with the prior art, the present invention eliminates the transmission speed change mechanism, large and small gears and transmission mechanical connection parts of the existing grinding equipment, and uses a permanent magnet synchronous motor to directly drive the grinding equipment cylinder, which simplifies the equipment structure and reduces the maintenance workload and operating noise. At the same time, through the frequency conversion speed regulation and control system, the grinding equipment can be soft started, soft stopped, slow driven, and optimized in operation process, which improves the safety and reliability of the equipment, improves the transmission efficiency of the equipment, and reduces the operating cost of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a front view of the present invention;

[0014] Figure 2 is a side view of the present invention;

[0015] Figure 3 A top view of the present invention;

[0016] Figure 4 This is a schematic diagram of the motor stator split structure;

[0017] Figure 5 This is a schematic diagram of the motor rotor split structure;

[0018] Figure 6 This is a schematic diagram of the installation of the motor rotor and the grinding cylinder;

[0019] Figure 7 This is a schematic diagram of the installation of the motor stator, grinding cylinder and base;

[0020] Figure 8 It is a schematic diagram of the three-coordinate adjustable structure of the base;

[0021] Fig. 9 This is a top view schematic diagram of the three-coordinate adjustable structure of the base. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0023] like Figure 1 , Figure 2 , Figure 3As shown, a low-speed permanent magnet synchronous motor directly driven variable frequency speed regulating grinding equipment comprises a grinding equipment, a low-speed permanent magnet synchronous motor driving a grinding cylinder 1-1 of the grinding equipment to rotate, and a variable frequency speed regulating control system thereof. Both ends of the grinding cylinder 1-1 of the grinding equipment are mounted on a roller support 1-3.

[0024] like Figure 5 As shown, the rotor of the low-speed permanent magnet synchronous motor is composed of a semicircular rotor upper lobe 3-1 and a semicircular rotor lower lobe 3-2 which can be aligned to form a ring. The mating surfaces of the rotor upper lobe and the rotor lower lobe are respectively provided with extended overlapping edge strips, and the overlapping edge strips are provided with connecting holes. After the rotor upper lobe and the rotor lower lobe are aligned, the rotor upper lobe and the rotor lower lobe are fixedly connected by the rotor connecting bolts 3-3 passing through the connecting holes; the rotor is arranged between one end face of the grinding cylinder 1-1 and the end cover 1-2, as shown in FIG. Figure 6 As shown, the rotor is fixedly mounted on the grinding cylinder by roller connecting bolts 1-4 which pass transversely through the end face edge of the grinding cylinder 1-1, the rotor and the edge of the end cover 1-2.

[0025] like Figure 1 , Figure 2 , Figure 3 , Figure 4 As shown, the stator of the low-speed permanent magnet synchronous motor is composed of an upper stator lobe 2-1 and a lower stator lobe 2-2 which can be matched to form a circular inner hole. The matching surfaces of the upper stator lobe and the lower stator lobe are respectively provided with extended overlapping edge strips, and the overlapping edge strips are provided with connecting holes. After the upper stator lobe and the lower stator lobe are matched, the upper stator lobe and the lower stator lobe are fixedly connected by stator connecting bolts 2-3 passing through the connecting holes; the shape of the lower stator lobe is a trapezoid with ears on both sides that gradually shrinks downward. The lower stator lobe is arranged in an adapted base 4 with a trapezoidal groove, and the ears on both sides are fixedly installed on the supporting platforms 4-1 on both sides of the groove of the base. As shown Figure 7 As shown, the stator is sleeved on the outer periphery of the rotor, and an air gap S is provided between the stator and the rotor. A temperature sensor 5 and a displacement sensor 6 are installed on the stator. Multiple temperature sensors can be provided to measure the temperature at multiple points in the motor. The displacement sensor is used to measure the size of the air gap between the stator and the rotor of the motor to realize online monitoring, early warning, and protection functions. A strong cooling fan 7 is installed above the low-speed permanent magnet synchronous motor to remove the heat generated in the motor in time, dissipate heat and cool down. Figure 1 The forced cooling fan is schematically drawn. Figure 2 , Figure 3 The temperature sensor 5 and the displacement sensor 6 are electrically connected to the variable frequency speed control system of the grinding equipment. The variable frequency speed control system presets the air gap monitoring warning and trip protection limit. When the measured air gap value reaches the protection limit, the variable frequency speed control system performs the corresponding warning or protection function.

[0026] The motor rotor and stator of the present invention both adopt a two-half split structure, which is convenient for the production, transportation, installation and maintenance of the motor. The rotor and stator can also be split into more petals as required. The stator can also be assembled by two adjacent groups, and assembly holes 2-4 are processed on the edge of the stator. The two adjacent groups of stators are connected by connecting bolts passing through the assembly holes.

[0027] like Figure 8 , Fig. 9 As shown, the base is a three-coordinate adjustable structure, and the position of the stator can be adjusted arbitrarily in the three directions of x, y, and z. The ears on both sides of the stator lower lobe are placed on the support platform 4-1 on both sides of the base 4 and fixedly installed on the base by the stator mounting bolts 4-3. The stator of the low-speed permanent magnet synchronous motor can be adjusted in the z direction (i.e. Figure 1 The front and rear sides and the outer ends of the support platform 4-1 on both sides of the base slot are provided with vertical edges, and the front and rear vertical edges and the outer end vertical edges are equipped with adjustment screws 4-2. The adjustment screws 4-2 on the front and rear vertical edges can be used to adjust the stator in the x direction (i.e. Figure 1 The displacement of the stator in the left and right directions is adjusted by adjusting screws 4-2 on the outer end vertical edge. Figure 1 The displacement of the stator in the front and rear direction.

[0028] The invention can be obtained by modifying the original grinding equipment, installing the rotor of the low-speed permanent magnet synchronous motor at the original large gear transmission of the grinding cylinder, removing the intermediate transmission speed change mechanism and mechanical connection parts connecting the motor shaft and the rotating shaft of the grinding cylinder, installing the rotor of the low-speed permanent magnet synchronous motor on the grinding cylinder, and using the low-speed permanent magnet synchronous motor to directly drive the grinding equipment cylinder. The low-speed permanent magnet synchronous motor is controlled by a variable frequency speed control system. The low-speed permanent magnet synchronous motor is directly commercially available.

[0029] In the variable frequency speed control system of the grinding equipment, the control program is preset according to the production process requirements to realize the automatic operation of the grinding equipment, the adjustment and automatic control of the rotor speed, the process condition monitoring, the real-time operation parameter monitoring of the motor, etc., to improve the safety and reliability of the equipment operation, improve the equipment transmission efficiency, reduce the maintenance workload, reduce the equipment operation cost, and realize the unattended operation of the grinding equipment. The variable frequency speed control system can adopt the existing technical system.

[0030] The above is only an implementation mode of the present invention. The scope of protection requested by the present invention is not limited to the implementation mode. All technical solutions equivalent to this embodiment belong to the protection scope of the present invention.

Claims

1. A low-speed permanent magnet synchronous motor directly driven variable frequency speed regulating grinding equipment, characterized in that: It includes grinding equipment, a low-speed permanent magnet synchronous motor for driving the grinding cylinder of the grinding equipment to rotate, and a variable frequency speed control system; Both ends of the grinding cylinder (1-1) of the grinding equipment are mounted on a roller support (1-3); The rotor of the low-speed permanent magnet synchronous motor is composed of a semicircular rotor upper lobe (3-1) and a semicircular rotor lower lobe (3-2) that can be aligned to form a ring, the mating surfaces of the rotor upper lobe and the rotor lower lobe are respectively provided with extended overlapping edge strips, and the overlapping edge strips are provided with connecting holes. After the rotor upper lobe and the rotor lower lobe are aligned, the rotor upper lobe and the rotor lower lobe are fixedly connected by rotor connecting bolts (3-3) passing through the connecting holes; the rotor is arranged between an end face of a grinding cylinder (1-1) and an end cover (1-2), and the rotor is fixedly mounted on the grinding cylinder by roller connecting bolts (1-4) that pass through the edge of the end face of the grinding cylinder, the rotor and the edge of the end cover in a transverse direction; The stator of the low-speed permanent magnet synchronous motor is composed of a stator upper lobe (2-1) and a stator lower lobe (2-2) that can be matched to form a circular inner hole. The matching surfaces of the stator upper lobe and the stator lower lobe are respectively provided with an extended overlapping edge strip, and the overlapping edge strip is provided with a connecting hole. After the stator upper lobe and the stator lower lobe are matched, the stator upper lobe and the stator lower lobe are fixedly connected by a stator connecting bolt (2-3) passing through the connecting hole. The stator lower lobe has an outer shape of a gradually downwardly contracted trapezoid with ears on both sides. The stator lower lobe is arranged in an adapted base (4) with a trapezoidal groove, and the ears on both sides are fixedly mounted on the supporting platforms (4-1) on both sides of the groove of the base. The stator is sleeved on the outer periphery of the rotor, and an air gap is provided between the stator and the rotor. A temperature sensor (5) for measuring the temperature inside the motor and a displacement sensor (6) for measuring the air gap between the stator and the rotor of the motor are installed on the stator; and a forced cooling fan (7) is installed above the low-speed permanent magnet synchronous motor.

2. The low-speed permanent magnet synchronous motor direct-driven variable frequency speed regulating grinding equipment according to claim 1 is characterized in that: The front, rear and outer ends of the supporting platform (4-1) on both sides of the base notch are provided with vertical edges, and adjusting screws (4-2) are mounted on the vertical edges.

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