Protection device for preventing screw from bending

Abstract

The utility model discloses a protection device for preventing a screw from bending, which relates to the technical field of hydraulic engineering and comprises an upper connecting sleeve, a neck bush is arranged in the upper connecting sleeve, the neck bush is sleeved on the outer side of an upper screw, a clamping groove is arranged at the bottom of the neck bush, a fixing pin is arranged on the lower portion of the upper screw, and the fixing pin is sleeved on the neck bush. The fixing pin is clamped in the clamping groove; the bottom of the upper connecting sleeve is fixedly connected with a lower connecting sleeve, a pressure spring is arranged in the lower connecting sleeve, the upper end of the pressure spring tightly abuts against the upper screw rod, and the lower end of the pressure spring tightly abuts against the lower connecting sleeve; and the bottom of the lower connecting sleeve is fixedly connected with the lower polish rod. When overload is caused by foreign matter blockage, the fixing pin is separated from the clamping groove, the upper screw rod idles in the upper connecting sleeve and does not move downwards any more, and the conditions that a gate is bent and cannot be opened and closed due to overload are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of water conservancy projects, in particular to a protective device for preventing a screw from bending. Background Art

[0002] Hydraulic metal gates are control facilities used to close and open discharge channels. They are an important part of hydraulic structures and can be used to intercept water flow, control water levels, regulate flow, discharge sediment and floating objects, etc.

[0003] Most cast iron gates and steel gates are opened and closed by screw gate opening and closing machines. During the opening and closing process, if something gets stuck at the bottom of the gate and the gate cannot be lowered during the closing process, the screw will be under constant downward pressure, which will eventually cause the screw to bend. The bending cannot be restored, resulting in the gate being unable to be opened and closed, which greatly affects the scheduling of channel water resources. Utility Model Content

[0004] The purpose of the utility model is to provide a protective device to prevent the screw from bending, so as to solve the problem mentioned in the background technology that foreign matter blocks the bottom of the gate, causing the gate to be unable to descend during the closing process, and the downward pressure will cause the screw to bend and cannot be restored, resulting in the gate being unable to open and close.

[0005] The utility model adopts the following technical solutions:

[0006] The utility model provides a protection device for preventing a screw from bending, comprising an upper connecting sleeve, an inner sleeve arranged in the upper connecting sleeve, the inner sleeve being arranged on the outer side of the upper screw, a clamping groove being arranged at the bottom of the inner sleeve, a fixing pin being arranged at the lower part of the upper screw, and the fixing pin being clamped in the clamping groove;

[0007] The bottom of the upper connecting sleeve is fixedly connected to the lower connecting sleeve, and a pressure spring is provided in the lower connecting sleeve. The upper end of the pressure spring is in close contact with the upper screw rod, and the lower end of the pressure spring is in close contact with the lower connecting sleeve.

[0008] The bottom of the lower connecting sleeve is fixedly connected to the lower polished rod.

[0009] Furthermore, a pad is provided at the bottom of the upper screw, and the pad rests on the pressure spring.

[0010] Furthermore, the inner sleeve is provided with a top screw groove, the upper connecting sleeve is provided with a top screw hole corresponding to the top screw groove, a top screw is provided in the top screw hole, and the top screw slides in cooperation with the top screw groove; an annular boss is provided on the inner side wall of the top end of the upper connecting sleeve, and a plurality of pressure adjusting bolts are threadedly connected to the annular boss, and the lower end of the pressure adjusting bolt rests on the inner sleeve.

[0011] Furthermore, a locking bolt is provided at the bottom of the upper connecting sleeve, and the locking bolt is tightly fitted with the upper screw rod.

[0012] Furthermore, the upper connecting sleeve and the lower connecting sleeve are connected by a bolt assembly.

[0013] Furthermore, a partition is provided in the lower connecting sleeve, the cavity above the partition is the upper cavity, and the cavity below the partition is the lower cavity; the pressure spring is provided in the upper cavity, and the pressure spring is in tight contact with the partition; the lower cavity is connected to the lower polished rod.

[0014] Furthermore, the lower polished rod and the lower connecting sleeve are connected via a polished rod connecting pin.

[0015] Compared with the prior art, the beneficial technical effects of the present invention are:

[0016] The utility model provides a card slot and a fixing pin on the inner sleeve and the upper screw rod, and a pressure spring is provided between the upper screw rod and the lower connecting sleeve. When foreign matter is blocked and the upper screw rod is overloaded, the fixing pin of the upper screw rod disengages from the card slot, and the upper screw rod idles in the upper connecting sleeve and cannot move downward, thereby avoiding the bending of the upper screw rod due to overload and the inability of the gate to be opened and closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the structure of the protection device for preventing the screw from bending in the present invention;

[0019] Figure 2 This is an appearance diagram of the protective device for preventing screw bending of the utility model;

[0020] Figure 3 This is a schematic structural diagram of the upper connecting sleeve and the inner bushing in the protective device for preventing screw bending of the present invention;

[0021] Figure 4 This is a schematic diagram of the installation effect of the pressure adjustment bolt in the protective device for preventing screw bending of the utility model;

[0022] Figure 5 This is a structural diagram of the lower connecting sleeve and the lower polished rod in the protective device for preventing the screw from bending according to the present invention;

[0023] Figure 6 This is an internal cross-sectional view of the opening and closing force overload protection device of the utility model when it is activated during operation.

[0024] Explanation of the accompanying drawings: 1. Upper connecting sleeve; 1-1. Top screw hole; 1-2. Locking bolt; 1-3. Annular boss; 2. Inner sleeve; 2-1. Slot; 2-2. Top screw slide; 2-3. Top screw; 2-4. Pressure adjusting bolt; 3. Upper screw; 3-1. Fixing pin; 4. Lower connecting sleeve; 4-1. Pressure spring; 4-2. Partition; 4-3. Upper cavity; 4-4. Lower cavity; 5. Lower polished rod; 5-1. Fixing hole; 5-2. Docking hole; 5-3. Polished rod connecting pin; 5-4. Split pin; 6. Pad; 7. Bolt assembly. DETAILED DESCRIPTION

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figures 1 to 3 As shown, this embodiment discloses a protective device for preventing screw rod bending, comprising an upper connecting sleeve 1, an inner sleeve 2 disposed within the upper connecting sleeve 1, and sleeved around the outer side of an upper screw rod 3. A retaining pin 3-1 is disposed at the bottom of the inner sleeve 2 and is received within the retaining pin 3-1. The lower portion of the upper connecting sleeve 1 is fixedly connected to a lower connecting sleeve 4 via a bolt assembly 7. A pressure spring 4-1 is disposed within the lower connecting sleeve 4, the upper end of which tightly contacts the upper screw rod 3, while the lower end of the pressure spring 4-1 tightly contacts the lower connecting sleeve 4. The bottom of the lower connecting sleeve 4 is fixedly connected to a lower polished rod 5.

[0027] In this embodiment, a backing plate 6 is provided at the bottom of the upper screw rod 3, which abuts against the pressure spring 4-1. The backing plate 6 increases the contact area between the pressure spring 4-1 and the upper screw rod 3, ensuring a stable pressure contact between the pressure spring 4-1 and the upper screw rod 3. When the fixing pin 3-1 of the upper screw rod 3 is released from the retaining groove 2-1, the upper screw rod 3, with the aid of the backing plate 6, can compress the pressure spring 4-1.

[0028] like Figure 3 and Figure 4 As shown, the inner sleeve 2 is provided with a top screw chute 2-2, the upper connecting sleeve 1 is provided with a top screw hole 1-1 corresponding to the top screw chute 2-2, and a top screw 2-3 is provided in the top screw hole 1-1. The top screw 2-3 is slidably matched with the top screw chute 2-2.

[0029] The sliding fit between the top screw groove 2-2 and the top screw 2-3 allows the inner sleeve 2 to move only in the vertical direction within the upper connecting sleeve 1. An annular boss 1-3 is provided on the inner sidewall of the top end of the upper connecting sleeve 1. A plurality of pressure adjustment bolts 2-4 are threadedly connected to the annular boss 1-3. The lower ends of the pressure adjustment bolts 2-4 abut against the inner sleeve 2. Adjusting the pressure adjustment bolts 2-4 can tighten the inner sleeve 2.

[0030] like Figure 5 As shown, in this embodiment, a partition 4-2 is provided on the lower connecting sleeve 4. A cavity is provided in the lower connecting sleeve 4. The cavity above the partition 4-2 is the upper cavity 4-3, and the cavity below the partition 4-2 is the lower cavity 4-4. A pressure spring 4-1 is provided in the upper cavity 4-3, and the pressure spring 4-1 is in close contact with the partition 4-2.

[0031] The lower cavity 4-4 is fixedly connected to the lower polished rod 5. The lower polished rod 5 is connected to the lower connecting sleeve 4 via a polished rod connecting pin 5-3. Specifically, the connecting end of the lower polished rod 5 is provided with a through-going fixing hole 5-1. The side wall of the lower cavity 4-4 is provided with a docking hole 5-2 that cooperates with the fixing hole 5-1. The fixing holes 5-1 and the docking holes 5-2 are provided with a through-going polished rod connecting pin 5-3. The polished rod connecting pin 5-3 passes through the fixing holes 5-1 and the docking holes 5-2 to connect the lower cavity 4-4 to the lower polished rod 5. One end of the polished rod connecting pin 5-3 is provided with a cotter pin 5-4 to prevent the polished rod connecting pin 5-3 from falling out.

[0032] In this embodiment, a locking bolt 1-2 is provided at the bottom of the upper connecting sleeve 1. The locking bolt 1-2 is located below the inner sleeve 2. The locking bolt 1-2 is tightly fitted with the upper screw rod 3. When the fixing pin 3-1 of the upper screw rod 3 is out of the slot 2-1 and the upper screw rod 3 rotates relative to the upper connecting sleeve 1, the locking bolt 1-2 can be tightened to tighten the upper screw rod 3 to prevent the upper screw rod 3 from rotating relative to the upper connecting sleeve 1.

[0033] like Figures 1 to 6 As shown, the working principle of the utility model is as follows:

[0034] When the gate needs to be closed, the upper end of the pressure spring 4-1 presses against the upper screw 3 through the pad 6, and the lower end of the pressure spring 4-1 rests on the lower connecting sleeve 4. The fixing pin 3-1 of the upper screw 3 is clamped in the clamping groove 2-1. Due to the clamping effect of the clamping groove 2-1 on the fixing pin 3-1, the upper screw 3 can be prevented from rotating. After the gate opening machine is started, the upper screw 3 can be driven downward normally to release the gate.

[0035] When the gate is blocked by foreign objects and cannot be closed, the lower connecting sleeve 4 and the lower polished rod 5 cannot move downward. At this time, the upper screw 3 continues to move downward under the action of the gate hoist. The upper screw 3 compresses the pressure spring 4-1 downward through the pad 6 until the fixing pin 3-1 is disengaged from the slot 2-1. The upper screw 3 will then idle in the upper connecting sleeve 1. At this time, the gate hoist cannot drive the upper screw 3 to move downward, thereby avoiding overload and bending of the upper screw 3.

[0036] It should be noted that when an emergency occurs, the locking bolts 1-2 can be tightened to lock the upper screw rod 3 so that it no longer rotates, thereby releasing the anti-bending function, increasing the downward pressure of the upper screw rod 3, and forcing the lower connecting sleeve 4 and the lower polished rod 5 downward to close the gate.

[0037] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements to the technical solutions of the present invention made by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A protective device for preventing screw bending, characterized by: The invention comprises an upper connecting sleeve (1), an inner sleeve (2) is arranged in the upper connecting sleeve (1), the inner sleeve (2) is sleeved on the outside of the upper screw rod (3), a clamping groove (2-1) is arranged at the bottom of the inner sleeve (2), a fixing pin (3-1) is arranged at the lower part of the upper screw rod (3), and the fixing pin (3-1) is clamped in the clamping groove (2-1); The bottom of the upper connecting sleeve (1) is fixedly connected to a lower connecting sleeve (4), a pressure spring (4-1) is provided in the lower connecting sleeve (4), the upper end of the pressure spring (4-1) is in close contact with the upper screw rod (3), and the lower end of the pressure spring (4-1) is in close contact with the lower connecting sleeve (4); The bottom of the lower connecting sleeve (4) is fixedly connected to the lower polished rod (5).

2. The protection device for preventing screw bending according to claim 1, characterized in that: A pad (6) is provided at the bottom of the upper screw rod (3), and the pad (6) abuts against the pressure spring (4-1).

3. The protection device for preventing screw bending according to claim 1, characterized in that: The inner sleeve (2) is provided with a top screw slide groove (2-2), the upper connecting sleeve (1) is provided with a top screw hole (1-1) corresponding to the top screw slide groove (2-2), a top screw (2-3) is provided in the top screw hole (1-1), and the top screw (2-3) is slidably matched with the top screw slide groove (2-2); An annular boss (1-3) is provided on the inner side wall of the top end of the upper connecting sleeve (1), and a plurality of pressure regulating bolts (2-4) are threadedly connected to the annular boss (1-3), and the lower ends of the pressure regulating bolts (2-4) abut against the inner sleeve (2).

4. The protection device for preventing screw bending according to claim 1, characterized in that: A locking bolt (1-2) is provided at the bottom of the upper connecting sleeve (1), and the locking bolt (1-2) is tightly fitted with the upper screw rod (3).

5. The protection device for preventing screw bending according to claim 1, characterized in that: The upper connecting sleeve (1) and the lower connecting sleeve (4) are connected via a bolt assembly (7).

6. The protection device for preventing screw bending according to claim 1, characterized in that: A partition (4-2) is provided in the lower connecting sleeve (4), the cavity above the partition (4-2) is the upper cavity (4-3), and the cavity below the partition (4-2) is the lower cavity (4-4); The pressure spring (4-1) is arranged in the upper cavity (4-3), and the pressure spring (4-1) is in close contact with the partition (4-2); The lower cavity (4-4) is connected to the lower polished rod (5).

7. The protection device for preventing screw bending according to claim 6, characterized in that: The lower polished rod (5) is connected to the lower connecting sleeve (4) via a polished rod connecting pin (5-3).

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