JPS5826774A - Lifting gear - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lifting device that connects a first floor and a second floor in, for example, an agricultural workshop.

Conventional lifting devices of this type use an electric motor as the drive source, and a bimetallic switch (thermal relay) is used to protect the motor against load limits, which can lead to contact failure or malfunction. The disadvantages are that the failure rate is high, and the power consumption is extremely high.

The present invention solves the above-mentioned conventional drawbacks, and aims to reduce the failure rate by using a hydraulic device as a drive source, and also reduces power consumption by using a logic circuit as a control means for the hydraulic device. The purpose of the present invention is to provide a lifting device that achieves savings in the amount of electricity.

To explain an embodiment, in the first factor and FIG. 2, (1) is a lifting chamber, (2) is a frame, and (3) is a hydraulic cylinder. The frame (2) is erected on the concrete floor (4) on the first floor of the agricultural workshop, and is installed on the second floor (5).
It is built to a suitable height by penetrating it, and rails (7) (7) are provided inside the central vertical frame (6) (6) on both sides, and a shock absorbing spring (8) is installed at the bottom.
There is no need to install a cable to receive the elevating chamber (1). The elevating chamber (1) is provided with upper and lower Lf wheels (9) to @ at the central part of the nJj side of the outer body, each of which has 14i wheels (9
) to 04 are rolled on the track of the curved rail (7) (7) and guided, thereby attaching the elevator door to the frame (2). In order to support the lifting room (1), one end of the wire (2) was attached to the lower part of the top part of the frame (2), and two wires were installed on the upper surface of the top plate aθ of the lifting room (1). Pass the wire 03 through the pulley θfio7),
Further, the other end of the wire 03 is wound around the wire drum OI via a roller 019' of a roller stand fixed on the upper surface of the frame top wall OI. On this roller stand (to), a hydraulic drum Q is coaxially attached to the pivot (e) of the wire drum 01, and the ratio of the diameter of the wire drum 0 and the diameter of the hydraulic drum is 2: It's number 1. 01 Hydraulic cylinder (3) is attached to the frame (2
), one end of the hydraulic wire (2) is attached to the upper end of the piston rod (a) extending from the top thereof, and the other end is wrapped around the hydraulic drum Q. ing.

When the piston rod of the hydraulic cylinder (3) is operated from the extended state to the retracted state, the hydraulic wire (
c) is unwound from the drum, the drum Qυ rotates, and this rotation rotates the wire drum OI via the pivot (1), winding the wire a into the drum 4, thereby causing the rising chamber ( 1) Lift it up. Also, if you operate the piston rod (2) in the opposite direction, the drums will be 0 and 6!
◇ rotates in the opposite direction and the elevator chamber (1) descends. In this case, the height of the hydraulic cylinder (3) reaches the second floor (5), and the maximum stroke of the piston rod (E) is It corresponds to the height of one bet in the farm field. Therefore.

When the elevating chamber (1) is set to be located above the first floor (4) when the piston rod (E) is in its most extended state as shown in FIG. 1, the drum OV6! Due to the diameter ratio of ◇, when the piston rod is in its most retracted state, the lifting chamber (1) is
It can be lifted to the top of the floor (5). In addition, the above-mentioned elevator room (1
), the other end of the shutter supporting wire 1 is attached to the 0G side of the top plate of the shutter ( ), and as shown in Figure 1, the elevator room (]) is 1
When located on the second floor, the shutter +72 is located on the second floor and closes the entrance for the elevator room on the second floor, and when the elevator room CI) is elevated and located on the second floor, the shutter +72 is located on the second floor and closes the entrance for the elevator room on the second floor. It descends under its own weight and rests on the first floor. In addition, the said elevator shaft can be lifted and opened by the operator even when it is closed.
C) is an oil tank, 2) is a hydraulic pump, and 2) is a motor that operates the hydraulic pump, and the discharge side of the hydraulic pump (E) is a magnetic valve for forward movement), a solenoid valve for backward movement, It is piped to the supply port of the hydraulic cylinder (3) via the speed control solenoid valve (to) and the speed control adjustment valve c3η.

The details of these valves @~c1η are as shown in Figure 8: double solenoid 4-port valve 0!1% single solenoid 4-port valve (to), pressure control valve (b), flow rate control valve (to), sea); ffJI, pilot check valve ■ is installed in the piping as shown. That is, the discharge port of the hydraulic pump (to) is connected to the connection port <p) of the double solenoid 4-port valve (A), and the connection port (A) is connected to the upper supply port (to) of the hydraulic cylinder (3). , connection port) and hydraulic cylinder (3
) is connected to the lower supply port (to), and the connection port (to) is connected to the return pipe via a pilot check valve. In addition, the connection port (2) of the single solenoid 4-boat valve (to) is branched from the discharge port of the hydraulic pump, and the connection port (P) is connected to the pilot check valve (2). Further, a pressure control valve (b) is branched and connected to the discharge port of the hydraulic pump (e), and a flow rate control valve (to) is connected to this via a seat valve).

The operation of the above hydraulic system is as follows. Immediately too.

First, the stopped state of the piston rod (on the piston rod) is the forward movement 111 (i
The valve (to) and the reverse solenoid valve (2) are both closed, and at this time, as shown in Figure 8, the double solenoid 4□ port valve (to) connects the connection port (P) @) and the connection port (A). )(B) are cut off from each other.

Next, the lifting chamber (1) moves upward, that is, the piston rod (
The reversing operation (a) (see Figure 1) is performed using the reversing solenoid valve (e).
At this time, as shown in Fig. 4, the double solenoid 4 port valve (to) is connected to its connection port Q').
and connection port (A) communicate with each other, and connection port α3) and connection port 0
<), so the pressure oil pumped by the pump (7) is supplied to the upper side of the hydraulic cylinder (3).
This causes the piston (22a) of the piston rod (A) to move backward, and at the same time, the oil is drained from the lower supply port (to) and returned through the pilot check valve θQ.

Lowering movement of the lifting chamber (1), i.e. the piston rod (2)
The forward movement occurs when the forward solenoid valve (C) in Figure 1 is activated and opened, and as shown in Figure 5, the connection port P) of the 4-boat valve is connected to the connection port (C). , the connection port [with]) communicates with the connection port IA)), and the pressurized oil of the pump) is supplied to the lower supply port of the hydraulic cylinder (3), thereby supplying the piston rod (2). While driving the piston ($12a) forward, oil is drained from the upper supply port (a). Furthermore, during this operation process, the first same speed control solenoid valve (
When the single solenoid 4-port valve (to) is activated, the connection port (to) is shut off from the communication state before activation as shown in Figure 6, so that the pressure supply oil valve (to) of the pump (e) is not connected. The branched oil component is supplied to the hydraulic cylinder (3), and the moving speed of the piston rod (a) is increased.Similarly, the speed is controlled in the case of the previously described backward movement of the piston rod (2). In the system, θ in Figure 7
0 is a pressure gauge, θ path is a stop valve, 0:9 is a relief valve, ■ is a check valve, ni) is an oil filter, and ni) is a strainer.

Furthermore, each of the above-mentioned solenoid valves (C) to (C) and the motor (F)
The control means will be explained. In Figure 1, the central height position (2) of the vertical frame (6) (6) of the frame (2) is shown.
Forward and backward limit switch 07 on the floor (equivalent to 5th floor)
) and a limit switch for speed control) are arranged, and the elevator chamber (
]) The actuating member θΦ is erected on the side wall of the. This operating member O
n has a first detection actuator ring at its upper end that presses the opening switch θ when the elevator chamber (1) is at the lowest position, and a first detection actuation ring at its lower end that presses the opening switch θ when the elevator chamber (1) is at the highest position. There is a second detection actuating part 151) that presses the θ, and an actuating member -
There is an eighth detection actuation section that continuously presses the speed control limit switch from the center to the bottom end.

In addition, an automatic switch 151, a start switch (foundation), and an emergency stop switch are installed in the elevator room (1), and their wires are wired to the top plate aυ, and connected to the wire cable i [+ sword from the large board OQ. and the above) lz-/,
(2) It is connected to the wiring box (roller) through the top wall (a movable slide that is wrapped around 17 roller steels and can suspend a tension weight). In addition, the roller and layer are cable φη
It has a built-in safety switch to protect the power supply, and is designed to trip the power supply directly.

Further pass the lead wire from the wiring box door.
It is connected to the logic circuit of the control panel by a lead wire including the wiring for the limit switch θ through the wiring box of Soto Suinochi 0 to (c), and its output end is connected to each of the solenoid valves (to) ) and motor) to the drive circuit (not shown).

FIG. 8 shows its logic circuit, and FIG. 9 shows its time chart. The circuits are AND circuits (A1) to (A21),
NAND circuit (NAI) ~ (Na3), NOT circuit (N1
) ~ (N15), resistance (R1) ~ (R'l) (R5-
R7=IKQ), capacitor (CI) ~ (C4) (C
2-C4=10μF), in the figure, (Sl)
is the normally closed contact of the forward/backward limit switch θ, (
N2) is the normally closed contact of the speed control limit switch (Foundation), (AUT) is the normally closed contact of the important type automatic switch, (5TAT) is the normally closed contact of the automatic reset type start switch (Foundation), ( Te3) is the normally open contact of the on/off type emergency θ stop switch, (PO) is the input 4-voltage line, G) is the ground,
(Sl) is the line % related to the normally closed contact (Sl)
(52 is the output line of the normally closed contact (N2), (S2
Negative, t (S2') negative line, (B) is the line related to the reverse solenoid valve output, (AIJT is (AUT)
The line related to (Ql) is the electromagnetic opening/closing 'a: + 1i which drives the motor (with the turn on of (AUT))
]Output terminal to the amplifier (not shown), (Q2) is the output terminal to the reversing solenoid valve (a), (Q3) is the output terminal to the speed control solenoid valve (to), (Q4) is the output terminal to the speed control solenoid valve (to). It is an output terminal to the forward solenoid valve), and a PG stabilized power supply is used as the circuit power supply.

Also, in the time chart, (tO) is the time when the start switch is pressed and the lift room (1) starts to rise, (tl) is the time when the lift room (1) rises at a predetermined speed, (t2 ) is the point in time when the start switch (goods) is pressed again to start lowering the elevator chamber (stool), and ([8] is the point in time when it descends at a predetermined speed).

The circuit operation will be explained below along with a time chart. still,
For convenience, the names of character symbols are omitted.

■) An automatic switch is activated before the start. Since the contact (AUT) is open, (All) and (Abin become H, and (A18) is the emergency stop switch (AUT).
H due to charging of capacitor (C4) for Te3) sushi
Therefore, (A17) and (Ql) become H.

As a result, the electromagnetic switch amplifier operates, the motor ψ) operates, and the hydraulic pump ■ becomes operational.

2) At the start time (tO), the limit switch θη is pressed by the actuator and the speed control limit switch is in the =a position, so its normally closed contact (Sl) is open and (S2) is closed. and therefore the capacitor (C1)
Therefore, (S1) becomes H, (S2) becomes L, and the output is added to (N1). Since (N1) becomes L and (S2) is Then, when the start switch (goods) is pressed, the contact (STAT) becomes H, (NA5) is closed, and (NA5) becomes H.
7) (AIO) (A16) (A8XA9) becomes II and (NA4) becomes H, which causes (A15) and (Q2) to become H, operating the reverse solenoid valve, and the hydraulic system is activated. Since the state shown in Figure 4 is reached, the piston rod (2)
begins a backward movement, and the elevator chamber (1) begins to rise. When you release the start switch (-), it will automatically return (STAT)
becomes L, but since (NA6) is H, (A16) remains H, so (A15) continues to be H, and the piston rod (A) retreats further, causing the limit switch θ to operate. Since (Sl) and (51 become L, (AIO) (A16) (A8) (A9) become L, but (A5) becomes H, so (NA4XA15) and (Q2 ) continues for 11 steps, the piston rod (a) is driven further backward, and the elevating chamber (1) rises.

3) At time (b), the actuator (5) presses the speed control limit switch (goods) due to the rise of the elevator chamber (1).

As a result, (S2) becomes open, capacitor (C2) is charged, (S2) (S2') becomes H, (A6) becomes H, and (A5) becomes H, so (A7XA14)
(Q3) becomes H, the speed control solenoid valve (7) operates, and the elevator chamber (1) continues to rise at a predetermined speed. When the elevator room (1) rises to the second floor (5) and the limit switch θ force is pressed again by the actuator 6i11, (Sl) (S
2) (Sl') (S2') becomes H, and (A5) becomes L by negation of (N8), so (NA4) (A15
) (Q2) becomes L and the reverse solenoid valve (2) stops operating, and the same < (A7) (A14) and (Q3)
becomes I7 and the speed control solenoid valve (to) stops operating,
Due to these, the hydraulic system becomes the state shown in FIG. 3, and the elevator room (1) stops above the second floor (5).

4) When descending, press the start switch 1) of the elevator room (1) (at time (t2)). Similarly to 2) above, (A16) becomes H due to the H of (STAT), and on the other hand, (A3) (A4) which was interlocked due to (NA4) (A7) becomes 1f, so (A19) ( A
18) and (Q4) become H, which activates the forward movement solenoid valve and the hydraulic system becomes the state shown in Figure 5. The piston rod (a) moves forward and the elevator chamber (1) descends. Start. Even if the limit switch θ (Sl) becomes L (S 2 ) due to the lowering of the elevator chamber (])
Because of H, (st') H.

Therefore, since (A5) is L, the speed control solenoid valve) and the reverse solenoid valve) are in a stopped state.

5) At time (t8), that is, when the elevator chamber (1) is lowered and the actuating part-4 is separated from the speed control limit switch (goods), (S2) HA L (!: It's (81) l; ! L
Therefore, (S1') becomes L and (S2') becomes H. Therefore, (A2) becomes H and (NA8) remains H, so (A4) (At s ) (Q4
) continues H, while (A5)tt L,
(Because (A20) becomes H due to H of Sl, (NA8
) becomes H and (A14) (Q3) becomes H. As a result, the speed control solenoid valve (2) is activated to ff, and the hydraulic system enters the state shown in FIG. 6, so that the elevator chamber continues to descend at a predetermined speed.

When the elevator chamber (1) descends to the 11V floor (4) and the limit switch θ is pressed and (Sl) becomes H, (S2
), so (S 1') becomes H as in the first state.
and (NA8) becomes L, so (A19) (A1
8) and (Q4) become L, and the forward solenoid valve (to) stops operating. Also, due to (A19), (A20) is 1. Then, (NA8) becomes L, so (A14) becomes L
As a result, the speed control 1R magnetic valve C1 stops operating, and the elevating chamber (1) stops (time (t4)).
).

6) If you press the start switch I) again with the automatic switch turned on, the elevator room () will begin to ascend as described above. In addition, when the emergency stop switch ■ is pressed during the operations in steps 1) to 5) above, the contact (Te3) closes and the capacitor Cc4)cn is discharged, causing (A18) to become L. Therefore, (A18) (A14) ) (A15) and (A
17) are all L, and (Ql) (Q2XQ8) and (
Q4) is connected to L1 and therefore all solenoid valves) to) and the motor (
b) stops operating.

In addition, the specifications of the logic circuit are as follows: - In the SN74 series gate, the temperature range is 0°C to +75°C, the input terminal P) is 5■, its allowable resistance is 5%, and the output resistance (R1)
~(R4) is 4.7 lights L series gate average Tpd 1
0 (ns), power consumption per series gate 10 (mW
), absolute maximum ratings, power supply voltage 7V, input voltage 5
．． 5V.

Maximum operating ambient temperature 0~+75°C1 Storage temperature -56°
Regarding the recommended operating conditions, the power supply voltage is 4.75 to 5.25V, and the fanout FO is within 10 for each gate.

As described above, according to the lifting device according to the present invention, since a hydraulic system is used as the driving means, protection against load limits can be provided by the hydraulic system, and therefore the failure rate is lower than that of a motor protection system. It is possible to minimize the load and increase the load limit, and it is also possible to use TT as a control means for hydraulic surface
Since we used a low voltage logic circuit with L elements, it was possible to turn off! ! It realizes a large reduction in power, and is used as agricultural power.
It exhibits various excellent effects, such as being able to effectively utilize power within W ~ 8KW.

It goes without saying that the lifting device according to the present invention can be used not only for agricultural lifting but also for various factories.

[Brief explanation of the drawing]

FIG. 1 is an overall front view showing an embodiment of the lifting device according to the present invention, FIG. 2 is a plan view thereof, FIGS. 3 to 7 are hydraulic system diagrams of the device, and FIG. 8 is a diagram of the same device. The logic circuit diagram and FIG. 9 are its time charts.3.
2)...Frame, (3)...Hydraulic cylinder, (
7)...Rail, 0 pier...Wire (¥ strip), c4
...Bis 1 Henrod, 0η (Foundation)...Limit switch. Figure 3 26 Figure 4 6 Figure 5 Figure 6

Claims (1)

[Claims] A lifting chamber that is movable and guided by a built-in rail is suspended by a cable, the end of the cable is connected to a piston rod of a hydraulic means, and the lifting chamber is raised and lowered by the reciprocating movement of the piston rod, A lifting device in which a limit switch is arranged in the lifting range of the lifting chamber, and the hydraulic means is controlled by a low voltage logic circuit of a TTL element.