Mining dump truck box hopper connecting rod limit switch

Abstract

The utility model relates to a connecting rod limit switch for a box hopper of a mining dump truck, which comprises a driven rod, a linkage rod and a switch seat. The linkage rod is hinged to the end, away from the hinge base, of the driven rod. The switch seat is fixed on a truck base; the end, away from the driven rod, of the linkage rod is hinged to the switch base through a hinge shaft. A sliding groove is formed in the switch base; the sliding groove is in an arc shape and is coaxial with the hinge shaft. A contact rod is fixed on the linkage rod; the contact rod is inserted into the sliding groove; a limiting switch is installed at the end, away from the truck, in the sliding groove. By means of the driven rod and the linkage rod, when the lifting cylinder lifts, the contact rod slides in the sliding groove, and when the lifting cylinder extends to a preset position, the contact rod makes contact with the limiting switch, the lifting cylinder stops rising, and therefore the lifting cylinder is effectively protected against damage caused by excessive lifting, and lifting limiting of a box hopper is achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of self-unloading truck, especially relates to a mine self-unloading truck box hopper connecting rod limit switch. BACKGROUND

[0002] Mine heavy self-unloading truck is widely used in large and medium-sized open-pit mine in China, such as Figure 1 As shown in the figure, the truck lifts the box hopper at the truck head through the lifting cylinder, due to the influence of the use environment such as the bumpy road surface, slope fluctuation and large slope of the equipment operation road surface; the long-time full-load operation of the truck causes the excessive wear and deformation of the large-diameter pin hole, main pin shaft and other parts, which causes the displacement of the truck large hopper in the use process due to the unbalanced loading of the box hopper, and the gap of the lifting limit switch is not controlled and fails, which easily causes the lifting cylinder pulling accident. After the pulling accident occurs, the truck output rate and production are directly affected. CONTENT

[0003] The utility model discloses a mine self-unloading truck box hopper connecting rod limit switch can limit the movement of the lifting cylinder.

[0004] In order to achieve the above object, the utility model adopts the technical scheme of a kind of mine self-unloading truck box hopper connecting rod limit switch, including two limit mechanisms;Two The limit mechanism is installed at the both sides of the truck tail base, and correspondingly with two lifting cylinders of the truck respectively;

[0005] The limit mechanism includes driven rod, connecting rod and switch seat,

[0006] One end of the driven rod is hinged with a hinge seat;The hinge seat is fixed at the bottom of the truck box hopper tail;

[0007] The connecting rod is hinged with the end of the driven rod away from the hinge seat;The switch seat is fixed on the truck base, and on the side of the connecting rod;The end of the connecting rod away from the driven rod is hinged with the switch seat through the hinge shaft;

[0008] The switch seat is provided with a sliding groove;The sliding groove is arc-shaped, and coaxial with the hinge shaft;The connecting rod is fixed with a contact rod;The contact rod is inserted into the sliding groove;The end of the sliding groove away from the truck is provided with a limit switch.

[0009] Preferably, the driven rod is a telescopic rod.

[0010] Preferably, the switch seat is provided with two sliding grooves;The connecting rod is fixed with two contact rods matched with the sliding grooves;The end of each sliding groove away from the truck is provided with a limit switch.

[0011] The utility model discloses a mine self -discharging truck box hopper connecting rod limit switch, and has the following advantages compared with prior art:

[0012] (1) through the driven rod and the linkage rod, when the lifting cylinder lifts, the contact rod slides in the sliding groove, when the lifting cylinder elongates to the predetermined position, the contact rod contacts the limit switch, and the lifting cylinder stops ascending, thereby effectively protecting the lifting cylinder from being damaged by over-lifting, to realize the box hopper lifting limiting;

[0013] (2) simple design, easy to use. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is truck lifting cylinder structure schematic diagram;

[0015] Figure 2 It is the utility model structure schematic diagram;

[0016] Figure 3 It is the structure schematic diagram after removing the linkage rod. DETAILED DESCRIPTION

[0017] The utility model is further explained in connection with the drawings and specific embodiment.

[0018] As Figures 2-3 Shown, a mine self -discharging truck box hopper connecting rod limit switch, including two limit mechanisms, two limit mechanisms are installed in the both sides of truck tail base 3, and respectively with two lifting cylinders of truck corresponding,

[0019] The limit mechanism includes driven rod 11, linkage rod 12 and switch seat 13,

[0020] One end of driven rod 11 is hinged with hinged seat 21, hinged seat 21 is fixed at the bottom of truck box hopper 2 tail, when truck box hopper 2 is lifted by lifting cylinder, the bottom of box hopper 2 moves to the oblique downward, and the one end of hinged seat 21 and driven rod 11 moves to the oblique downward,

[0021] The linkage rod 12 is hinged with the end of driven rod 11 away from the hinged seat 21, the switch seat 13 is fixed on the truck base 3, and is on the side of linkage rod 12, the end of linkage rod 12 away from driven rod 11 is hinged with switch seat 13 through hinged shaft 121, when the end of driven rod 11 away from linkage rod 12 moves to the oblique downward, the end of linkage rod 12 close to driven rod 11 moves to the oblique downward along with it, and the end of switch seat 13 hinged rotates around hinged shaft 121,

[0022] The switch base 13 is provided with a sliding groove 131; the sliding groove 131 is arc-shaped and coaxial with the hinge shaft 121; the connecting rod 12 is fixed with a contact rod 122; the contact rod 122 is inserted into the sliding groove 131, and when the connecting rod 12 rotates around the hinge shaft 121, the contact rod 122 slides in the sliding groove 131; the end of the sliding groove 131 away from the truck is provided with a limit switch, wherein the limit switch corresponds to the lifting cylinder on the same side, and during the lifting process of the lifting cylinder, the truck box 2 drives the driven rod 11 to move obliquely downward, the connecting rod 12 slides around the hinge shaft 121, and the contact rod 122 slides in the sliding groove 131; when the lifting cylinder is elongated to a predetermined position, the contact rod 122 contacts the limit switch, power supply of the lifting limit electromagnetic valve coil is controlled, so that the electromagnetic valve is effectively activated to cut off the pilot oil to the lifting control valve, the lifting cylinder stops rising, so that the lifting cylinder is effectively protected from being damaged by over-lifting, and the lifting limiting of the box 2 is realized.

[0023] In the embodiment, the driven rod 11 is a telescopic rod, and is fixed to be telescopic through bolts; when it is necessary to adjust the elongation distance of the lifting cylinder, the bolts are loosened, and the length of the driven rod 11 is adjusted, so that the normal work of the connecting rod limit switch can be ensured.

[0024] In the embodiment, the switch base 13 is provided with two sliding grooves 131; the connecting rod 12 is fixed with two contact rods 122 matched with the sliding grooves 131, and the two contact rods 122 are coaxial with the hinge shaft 121; the end of each sliding groove 131 away from the truck is provided with a limit switch, and the two limit switches are connected in parallel and contacted by the two contact rods 122 respectively, so that damage of one limit switch is prevented.

[0025] The utility model uses the method as follows: during the lifting process of the lifting cylinder, the truck box 2 drives the driven rod 11 to move obliquely downward, the end of the connecting rod 12 close to the driven rod 11 moves obliquely downward, the end of the connecting rod 12 hinged to the switch base 13 rotates around the hinge shaft 121, and the contact rod 122 slides in the sliding groove 131; when the limit parts on the same side of the lifting cylinder are elongated to a predetermined position, the contact rod 122 contacts the limit switch, and the lifting cylinder stops rising.

Claims

1. A limit switch for a mining dump truck bed linkage, characterized in that, It includes two limiting mechanisms; the two limiting mechanisms are installed on both sides of the truck rear base (3) and correspond to the two lifting cylinders of the truck respectively; The limiting mechanism includes a driven rod (11), a connecting rod (12), and a switch base (13). One end of the driven rod (11) is hinged to a hinge seat (21); the hinge seat (21) is fixed to the bottom of the rear of the truck bed (2); The connecting rod (12) is hinged to the end of the driven rod (11) away from the hinge seat (21); the switch seat (13) is fixed on the truck base (3) and on one side of the connecting rod (12); the end of the connecting rod (12) away from the driven rod (11) is hinged to the switch seat (13) through the hinge shaft (121); The switch base (13) is provided with a sliding groove (131); the sliding groove (131) is arc-shaped and coaxial with the hinge shaft; a contact rod (122) is fixed on the connecting rod (12); the contact rod (122) is inserted into the sliding groove (131); a limit switch is installed at the end of the sliding groove (131) away from the truck.

2. The limit switch for the docking station of a mining self-unloading truck according to claim 1, characterized in that, The driven rod (11) is a telescopic rod.

3. The limit switch for the docking station of a mining self-unloading truck according to claim 1, characterized in that, The switch base (13) has two sliding grooves (131); the linkage rod (12) has two contact rods (122) that cooperate with the sliding grooves (131); each sliding groove (131) has a limit switch installed at the end away from the truck.

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