Crane quay crane trolley position measuring device

Abstract

The utility model relates to the field of quay crane trolley position measurement, and particularly discloses a crane quay crane trolley position measuring device, which comprises a pulse encoder arranged on an output shaft of a motor, the pulse encoder is electrically connected with a frequency converter of the motor, and the frequency converter is electrically connected with a PLC (Programmable Logic Controller); the device further comprises a follow-up component following the quay crane trolley, the follow-up component is installed on a buffer base in front of a traveling wheel of the quay crane trolley, an absolute value encoder is installed on the follow-up component, and the absolute value encoder is electrically connected with the PLC. According to the utility model, the absolute value encoder is mounted by adopting the follow-up part and is matched with the pulse encoder for use, so that the accuracy of position detection is improved, the original motor structure is not changed, the equipment mounting space is not increased, and the sealing property of the motor and the stable operation of the crane trolley structure are ensured.

Description

Technical Field

[0001] The utility model relates to the field of quay crane trolley position measurement, in particular to a quay crane trolley position measurement device. Background Art

[0002] At present, the trolley mechanism of the crane quay crane has only one set of pulse encoders, which are connected to the frequency converter through the PLC, and the frequency converter is connected to the motor driven by it. The motor output shaft of the motor is equipped with a pulse encoder, which is connected to the frequency converter. The frequency converter transmits the motor speed collected by the pulse encoder to the frequency converter, and the frequency converter feeds the motor speed back to the PLC. The PLC compares the encoder pulse quantity corresponding to the actual speed of the variable frequency motor collected with the set value of the variable frequency motor speed preset in the PLC in real time. However, it was found in use that the left and right sides of the trolley mechanism have speed deviations due to motor speed and mechanical transmission, and the position detection calculated by a pulse encoder is inaccurate. If an absolute value encoder is added to the motor output shaft, the motor output shaft will become longer, affecting the sealing of the motor, and increasing the installation space of the equipment, affecting the trolley structure of the crane. Summary of the invention

[0003] In order to solve the above problems, the utility model provides a crane quay crane trolley position measuring device, which adopts a follow-up component to install an absolute value encoder, which is used in conjunction with a pulse encoder to improve the accuracy of position detection without changing the original motor structure or increasing the equipment installation space, thereby ensuring the sealing of the motor and the smooth operation of the crane trolley structure.

[0004] The technical solution of the utility model is: a position measuring device for a crane quay crane trolley, comprising a pulse encoder installed on an output shaft of a motor, the pulse encoder is electrically connected to a frequency converter of the motor, the frequency converter is electrically connected to a PLC, the device also comprises a follow-up component that follows the quay crane trolley, the follow-up component is installed on a buffer base in front of the traveling wheel of the quay crane trolley, an absolute value encoder is installed on the follow-up component, and the absolute value encoder is electrically connected to the PLC.

[0005] In an optional embodiment, the follower component includes a fixed bracket, a follower wheel and a connecting bracket, the follower wheel is concentric with the traveling wheel of the quay crane trolley; one end of the connecting bracket is connected to the fixed bracket, and the other end is connected to the output shaft of the follower wheel; the absolute encoder is installed on the output shaft of the follower wheel.

[0006] In an optional embodiment, the fixed bracket is installed on the buffer base in front of the traveling wheel of the quay crane trolley.

[0007] In an optional embodiment, the fixing bracket is an angle steel bracket, which is mounted on the buffer base by welding.

[0008] In an optional embodiment, the link bracket is connected to the fixed bracket by bolts.

[0009] In an optional embodiment, a tension spring is connected between the fixed bracket and the link bracket.

[0010] In an optional implementation, the absolute encoder is connected to the PLC via a DP bus.

[0011] The utility model provides a device for measuring the position of a crane quay crane trolley, which has the following beneficial effects compared with the prior art: a follow-up component that follows the quay crane trolley is configured, and an absolute encoder is installed on the follow-up component, so that the walking position of the trolley can be accurately measured, and the precise detection of the trolley position can be achieved without changing the original motor structure or increasing the equipment installation space, thereby ensuring the sealing of the motor and the smooth operation of the crane trolley structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 The utility model is a schematic diagram of the structure of a crane quay crane trolley position measuring device provided in an embodiment of the utility model.

[0014] Figure 2 The structure of the follower component Figure 1 .

[0015] Figure 3 The structure of the follower component Figure 2 .

[0016] Figure 4 It is a schematic diagram of the circuit principle structure of the crane quay crane trolley position measurement device.

[0017] In the figure, 100-follow-up component, 101-fixed bracket, 102-link bracket, 103-tension spring, 104-follow-up wheel, 200-travel wheel, 300-absolute encoder, 400-PLC, 500-frequency converter, 600-motor, 700-pulse encoder. DETAILED DESCRIPTION

[0018] The present invention will be described in detail below with reference to the accompanying drawings and through specific embodiments. The following embodiments are explanations of the present invention, but the present invention is not limited to the following implementation modes.

[0019] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood by specific circumstances.

[0020] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0021] like Figure 1-Figure 4 As shown, a crane quay crane trolley position measuring device provided by an embodiment of the utility model includes a pulse encoder 700, a frequency converter 500, a motor 600, a PLC 400, and a follower component 100. The pulse encoder 700 is installed on the output shaft of the motor 600, the pulse encoder 700 is electrically connected to the frequency converter 500 of the motor 600, and the frequency converter 500 is electrically connected to the PLC 400. The follower component 100 follows the quay crane trolley, the follower component 100 is installed on the buffer base in front of the quay crane trolley travel wheel 200, the absolute value encoder 300 is installed on the follower component 100, and the absolute value encoder 300 is electrically connected to the PLC 400. The absolute value encoder 300 can adopt the ELCO high-precision absolute value encoder 300, which is connected to the PLC 400 through the DP bus, and the DP bus transmits the data information collected by the absolute value encoder 300 to the PLC 400.

[0022] The follower component 100 includes a fixed bracket 101, a follower wheel 104 and a link bracket 102. The follower wheel 104 is concentric with the running wheel 200 of the quay crane trolley to ensure safe and reliable operation; one end of the link bracket 102 is connected to the fixed bracket 101, and the other end is connected to the output shaft of the follower wheel 104; the absolute encoder 300 is installed on the output shaft of the follower wheel 104. Among them, the fixed bracket 101 is an angle steel bracket, which is installed on the buffer base in front of the running wheel 200 of the quay crane trolley by welding. For easy installation, the link bracket 102 is connected to the fixed bracket 101 by bolts. A tension spring 103 is also connected between the fixed bracket 101 and the link bracket 102. The follower wheel 104 follows the quay crane trolley mechanism in operation; the absolute encoder detects the specific position of the trolley and has a numerical feedback function; the fixed bracket 101 is used to fix and install the follower component 100; the connecting bracket 102 mainly connects the follower wheel 104 and the quay crane into one; the tensioning spring 103 is mainly used to adjust the tension of the follower wheel 104, which plays a shock-absorbing and buffering role.

[0023] It should be noted that the absolute encoder 300 is fixed on the follower wheel 104, follows the operation and feedbacks the value, the DP cable is fixed at the tail of the encoder, and the absolute encoder 300 is equipped with a code disk with a grating inside, and the value is obtained by rotating the code disk. The outside of the encoder itself does not rotate, and the DP cable is also fixed and does not rotate.

[0024] In a specific embodiment, a wheel follower 100 and an ELCO high-precision absolute encoder 300 are installed at the traveling wheel 200 of the trolley frame, and the wheel follower 100 and the ELCO high-precision absolute encoder 300 are directly connected to the Siemens communication network of the whole machine through a PROFIBUS-DP cable, and the actual running distance of the trolley is calculated by the absolute encoder pulse change. At the same time, a pulse encoder 700 is set on the output shaft of the variable frequency motor 600 of the trolley mechanism as a closed-loop control of the frequency converter 500.

[0025] The above disclosure is only the preferred implementation mode of the utility model, but the utility model is not limited thereto. Any non-creative changes that can be thought of by technicians in this field, as well as several improvements and modifications made without departing from the principle of the utility model, should fall within the scope of protection of the utility model.

Claims

1. A crane quay crane trolley position measuring device, comprising a pulse encoder mounted on a motor output shaft, the pulse encoder being electrically connected to a frequency converter of the motor, the frequency converter being electrically connected to a PLC, characterized in that: The device also includes a follow-up component that follows the movement of the quay crane trolley. The follow-up component is installed on a buffer base in front of the traveling wheel of the quay crane trolley. An absolute value encoder is installed on the follow-up component, and the absolute value encoder is electrically connected to the PLC.

2. The crane quay crane trolley position measuring device according to claim 1 is characterized in that: The follower component includes a fixed bracket, a follower wheel and a connecting bracket. The follower wheel is concentric with the traveling wheel of the quay crane trolley. One end of the connecting bracket is connected to the fixed bracket, and the other end is connected to the output shaft of the follower wheel. The absolute encoder is installed on the output shaft of the follower wheel.

3. The crane quay crane trolley position measuring device according to claim 2 is characterized in that: The fixed bracket is installed on the buffer base in front of the traveling wheel of the quay crane trolley.

4. The crane quay crane trolley position measuring device according to claim 3 is characterized in that: The fixed bracket is an angle steel bracket, which is installed on the buffer base by welding.

5. The crane quay crane trolley position measuring device according to claim 2, 3 or 4, characterized in that: The link bracket is connected to the fixed bracket through bolts.

6. The crane quay crane trolley position measuring device according to claim 2, 3 or 4, characterized in that: A tension spring is connected between the fixed bracket and the link bracket.

7. The crane quay crane trolley position measuring device according to any one of claims 1 to 4, characterized in that: The absolute encoder is connected to the PLC via the DP bus.

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