CN109752903B - Truss structure for remote sensing camera and assembling method thereof - Google Patents

Abstract

The invention relates to a truss structure for a remote sensing camera, which comprises a first truss column, a second truss column, a plurality of truss rods and a plurality of connectors, wherein the first truss column is connected with the second truss column; a connector is connected respectively at the both ends of truss, the both ends of truss respectively corresponding to first purlin post with the second purlin post and through the corresponding connector with first purlin post with second purlin post fixed connection, on corresponding first purlin post or second purlin post were located to the connector cover, and clearance fit between the two, connector and first purlin post and second purlin post adoption mode fixed connection who splices. The truss framework provided by the invention has the advantages of short installation period, small size error and high reliability.

Description

Truss structure for remote sensing camera and assembling method thereof

technical field

The invention relates to the technical field of aerospace optical remote sensing, in particular to a truss structure for a remote sensing camera and an assembling method thereof.

Background technique

With the advancement of science and technology and the continuous improvement of the level of space remote sensing, human beings have more and more needs for large-diameter and long-focus remote sensing cameras. Due to the continuous enlargement of the aperture and focal length of the remote sensing camera, its own mass and volume will become very large. In order to ensure that the performance of the entire camera meets the index requirements, the rigidity and strength of the main load-bearing structure of the camera body are required to be high. Since the design idea of the truss rod structure conforms to the structural optimization design principle of "changing the bending load of the structural member into the tensile and compressive load", it has the characteristics of high specific stiffness and suitable for space optical systems with high requirements for light weight, so many large-diameter optical cameras have the characteristics of The design adopts the main fuselage structure of truss rods, such as Hubble.

At present, the installation and adjustment process of the truss structure body used by the remote sensing camera for the remote sensing camera is generally that the truss rod and the rod joint are first fixedly connected, and then connected to the truss frame through the trim pad. Rod installation requires multiple measurements, and training and adjustment of pads to ensure the accuracy of installation, resulting in a long period of installation and low efficiency, and because the training and adjustment pads cannot reach the theoretical size, each truss rod There is a certain amount of assembly stress during installation; secondly, due to the large number of truss rods, the frames are over-constrained with each other, resulting in the actual position of the frame often deviating from the theoretical position.

In view of this, it is necessary to provide a new truss structure for remote sensing cameras and an assembling method thereof.

SUMMARY OF THE INVENTION

The invention provides a truss structure for a remote sensing camera with short installation period, small size error and high reliability and an assembling method thereof.

The invention provides a truss structure for a remote sensing camera, comprising a first truss column, a second truss column, a plurality of truss rods and a plurality of connecting heads; two ends of the truss rods are respectively connected with a connecting head, and the truss Both ends of the rod correspond to the first truss column and the second truss column respectively and are fixedly connected with the first truss column and the second truss column through corresponding connecting heads, and the connecting heads are sleeved on the corresponding On the first truss column or the second truss column, and there is a clearance fit between the two, the connecting head is fixedly connected with the first truss column and the second truss column by means of gluing.

In a preferred embodiment, a plurality of first installation holes are opened on one side of the first truss column, and a plurality of first installation holes corresponding to the plurality of first installation holes are opened on one side of the second truss column. Two mounting holes; the first mounting hole and the second mounting hole are both circular and provided with internal threads; the cross-section of the connector is annular and the outer surface of the connector is provided with a The first installation hole or the second installation hole is matched with the external thread, and the outer side of the connector is glued and then screwed into the corresponding first installation hole or the second installation hole.

In a preferred embodiment, one end of each truss rod is accommodated in a connecting head, and the truss rod can not only slide back and forth along the axial direction of the connecting head, but also rotate around the axial direction of the connecting head.

In a preferred embodiment, the truss rod is in the form of a bar-shaped cylinder, and the matching size gap between the connecting head and the truss rod is 0.1 mm-0.15 mm.

In a preferred embodiment, a glue injection hole and an observation hole are opened from the outer surface of the connector to communicate with the internal accommodating cavity; wherein the number of the glue injection holes is one, which is used for injecting into the connector Adhesive glue; the number of the observation holes is at least two. When injecting glue, each observation hole needs to have adhesive glue overflowing, and glue overflowing at the transition position between the connecting head and the truss rod.

In a preferred embodiment, the length of each stringer is not greater than the distance between the corresponding first installation hole and the corresponding second installation hole.

The present invention also provides a method for assembling a truss structure for a remote sensing camera, comprising the following steps:

After applying a thin layer of glue on the connecting surface of the truss rod and the connecting head, pre-connect the truss rod and the connecting head;

After the truss rod is pre-connected with the connecting head, the connecting heads at both ends of the truss rod are glued to be fixed with the first truss column and the second truss column respectively;

After the connecting head is fixed to the first stringer column and the second stringer column, adjusting the relative position of the stringer rod and the connecting head along the axial direction of the connecting head;

After adjusting the relative positions of the truss rod and the connecting head, inject glue into the assembly gap between the truss rod and the connecting head through the glue injection hole to ensure that all the observation holes have glue overflowing, And there is glue overflow at the transition position between the connecting head and the truss rod, clean up the overflowing glue;

When the adhesive layer is completely cured, the assembly is completed.

In a preferred embodiment, before the step of pre-connecting the truss rod and the connecting head after applying a thin layer of glue on the connecting surface of the truss rod and the connecting head:

The first truss and the second truss are fixed by external support members to ensure that an accurate dimensional and positional relationship is established between the first truss and the second truss, and the first truss and The distance between the second stringers is adjustable within the allowable tolerance range;

After the step of fully curing the adhesive layer, it also includes:

Remove the outer supports securing the first and second stringers.

In a preferred embodiment, before the step of pre-connecting the truss rod and the connecting head after applying a thin layer of glue on the connecting surface of the truss rod and the connecting head:

Try to install the connector to one of the stringers one by one, and try to install the connector to the first/second stringer one by one, wherein the connection between the connector and the stringer is matched The size gap is 0.1mm-0.15mm to ensure that the truss rod is slidably arranged relative to the connecting head in both the axial direction and the circumferential direction.

In the truss structure provided by the present invention, the installation period is shortened by positioning the first truss column and the second truss column at one time and completing subsequent assembly; and the truss rod can be freely in the corresponding connecting head during the installation process Sliding or turning so that there is no internal stress on the stringer. The truss structure provided by the invention has short installation period, small size error and high reliability.

Description of drawings

FIG. 1 is a schematic structural diagram of a truss structure for a remote sensing camera provided by the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Referring to FIG. 1 , the present invention provides a truss structure 100 for a remote sensing camera, including a first truss column 10 , a second truss column 20 , a plurality of trusses 30 and a plurality of connectors 40 . The two ends of the truss rod 30 are respectively connected with a connecting head 40 , and the two ends of the truss rod 30 correspond to the first truss column 10 and the second truss column 20 respectively, and are connected with all the truss rods through the corresponding connecting heads 40 . The first stringer 10 and the first stringer 20 are fixedly connected. The connecting head 40 is sleeved on the corresponding first truss column 10 or the second truss column 20, and there is a clearance fit between the two; fixed connection.

In one embodiment, a plurality of first installation holes 11 are opened on one side of the first stringer 10 , and a plurality of first installation holes 11 are formed on one side of the second stringer 20 . A plurality of second mounting holes 21 . The first installation hole 11 and the second installation hole 21 are both circular and provided with internal threads; the cross section of the connecting head 40 is annular and the outer surface of the connecting head 40 is provided with a The external thread matched with the first installation hole 11 or the second installation hole 21. The outer side of the connector 40 is glued and then screwed into the corresponding first installation hole 11 or the second installation hole 20 .

One end of the truss rod 30 is accommodated in a connecting head 40 , and the truss rod 30 can not only slide back and forth along the axial direction of the connecting head 40 , but also rotate around the axial direction of the connecting head 40 . In this embodiment, the truss rod 30 is cylindrical in shape of a strip, and the matching size gap between the connecting head 40 and the truss rod 30 is controlled to be 0.1-0.15mm.

Further, a glue injection hole 41 and an observation hole 42 are opened from the outer surface of the connecting head 40 to communicate with its inner accommodating cavity; Glue is injected into the inner accommodating cavity; the number of the observation holes 42 is at least two. When the glue is injected, each observation hole 42 needs to have the overflow of the glue, and the connection between the connecting head 40 and the truss rod 30 is required. There is also glue overflow at the transition position.

Still further, the length of each truss rod 30 is not greater than the distance between the corresponding first installation hole 11 and the corresponding second installation hole 21 , so as to facilitate subsequent installation and tightening.

The present invention also provides a method for assembling a truss structure for a remote sensing camera:

S1, the first truss 10 and the second truss 20 are fixed by an external support to ensure that an accurate size and position relationship is established between the first truss 10 and the second truss 20, and all the The distance between the first stringer 10 and the second stringer 20 is adjustable within an allowable tolerance range.

Adjustment within the allowable tolerance range can be understood as ensuring sufficient assembly clearance between the stringer 30 and the connecting head 40 ; in other words, there is a certain relative sliding amount between the first stringer 10 and the second stringer 20 .

Further, before this step, pre-processing of the first stringer and the second stringer may also be added.

S2, try to install the connection head 40 to the truss rod 30 one by one, and try to install the connection head 40 to the first stringer 10/the second stringer 20 one by one, wherein the connection head The matching size gap between 40 and the truss rod 30 is 0.1mm-0.15mm, so as to ensure that the truss rod 30 is slidably arranged relative to the connecting head 30 in both the axial direction and the circumferential direction.

In this step, during the trial assembly process, it is checked whether each component meets the assembly requirements, for example, whether there is good contact between the first truss column or the second truss column and the installation surface of the connecting head 40; the connecting head 40 and the girder Whether the matching size gap between the rods 30 meets the requirements, whether the two can move with each other in the axial direction, whether the truss rod 30 can rotate relative to the connecting head 40 around the axis, etc.; components are modified to meet the above requirements.

Steps S3 to S7 are the formal assembly process of the truss structure. The assembly process of all the truss rods, the connecting head 40 and the installation holes of the truss columns 10 and 20 are assembled in the same scheme. The following are the detailed installation steps:

S3, after applying a thin layer of glue on the connecting surface of the truss rod 30 connected with the connecting head 40, pre-connecting the truss rod 30 and the connecting head 40;

S4, after the truss rod 30 is pre-connected with the connecting head 40, the connecting heads 40 at both ends of the truss rod 30 are glued to be fixed to the first truss column 10 and the second truss column 20 respectively;

S5, after the connecting head 40 is fixed to the first stringer 10 and the second stringer 20, adjust the relative relationship between the stringer 30 and the connecting head 40 along the axial direction of the connecting head 40 Location,

S6, after adjusting the relative positions of the truss rod 30 and the connecting head 40, inject glue into the assembly gap between the truss rod 30 and the connecting head 40 through the glue injection hole 41 to ensure that all the observation holes 42 are There is glue overflow, and there is glue overflow at the transition position between the connecting head 40 and the stringer 30, and the overflowed glue is cleaned up;

S7, when the adhesive layer is completely cured, the assembly is completed;

S8 , remove the external support for fixing the first stringer 10 and the second stringer 20 .

In the above steps, step S1 and step S2 do not necessarily have a sequential relationship; if conditions are ripe, the above two steps can also be omitted. When step S1 is omitted, step S8 can also be omitted.

The truss structure and assembling method for remote sensing cameras provided by the present invention shorten the installation period by positioning the first truss 10 and the second truss 20 at one time and completing subsequent assembly; During the installation process, it is free to slide or rotate in the corresponding connecting head 40 , so that there is no internal stress in the stringer 30 . The truss structure 100 provided by the present invention has short installation period, small size error and high reliability.

The above-mentioned embodiments only represent one or several embodiments of the present invention, and the descriptions thereof are relatively specific and detailed, but should not be construed as a limitation on the scope of the invention patent. It should be pointed out that for those skilled in the art, without departing from the concept of the present invention, several modifications and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims (7)

1. A truss structure for a remote sensing camera, comprising: the truss comprises a first truss column, a second truss column, a plurality of truss rods and a plurality of connectors; the two ends of the truss are respectively connected with a connector, the two ends of the truss are respectively corresponding to the first truss column and the second truss column and are fixedly connected with the first truss column and the second truss column through the corresponding connectors, the connectors are sleeved on the corresponding first truss column or the second truss column and are in clearance fit with each other, and the connectors are fixedly connected with the first truss column and the second truss column in a glue joint mode;

a plurality of first mounting holes are formed in one side of the first truss column, and a plurality of second mounting holes corresponding to the first mounting holes are formed in one side of the second truss column; the first mounting hole and the second mounting hole are both circular and are provided with internal threads; the cross section of the connector is circular, external threads capable of being matched with the first mounting hole or the second mounting hole are arranged on the surface of the outer circle of the connector, and the outer side of the connector is coated with glue and then screwed into the corresponding first mounting hole or the second mounting hole;

a glue injection hole and an observation hole which are communicated with the inner accommodating cavity are formed in the outer surface of the connector; the number of the glue injection holes is one, and the glue injection holes are used for injecting bonding glue into the connector; the quantity of observation hole is two at least, and during the injecting glue, each observation hole all need have the bonding glue to spill over, and the connector with the transition position of longeron also has gluey to spill over.

2. The truss structure for a remote sensing camera of claim 1, wherein one end of each of the spars is received in a connector, the spars being capable of both reciprocating sliding along an axial direction of the connector and rotating around the axial direction of the connector.

3. The truss structure for a remote sensing camera of claim 2, wherein the truss is in the shape of a strip cylinder, and the fitting size gap between the connector and the truss is 0.1mm-0.15 mm.

4. The truss structure for a remote sensing camera of claim 1, wherein each truss rod has a length no greater than a distance between the corresponding first mounting hole and the corresponding second mounting hole.

5. A method of assembling a truss structure for a remote sensing camera as defined in claim 1, wherein the method of assembling comprises:

after a layer of thin glue is coated on the connecting surface of the truss rod connected with the connector, the truss rod is pre-connected with the connector;

after the truss is pre-connected with the connectors, gluing the connectors at two ends of the truss to respectively fix the connectors with the first truss column and the second truss column;

after the connector is fixed to the first truss column and the second truss column, the relative position of the truss rod and the connector is adjusted along the axial direction of the connector,

after the relative positions of the trussed beam and the connector are adjusted, glue is injected into an assembly gap between the trussed beam and the connector through the glue injection holes, so that glue is ensured to overflow from all observation holes, glue also overflows from the transition position between the connector and the trussed beam, and the overflowed glue is cleaned;

and finishing the assembly after the adhesive layer is completely cured.

6. The method of assembling a truss structure for a remote sensing camera of claim 5, wherein,

the truss and the connector are pre-connected after a layer of thin glue is coated on the connecting surface of the truss connected with the connector, and the method further comprises the following steps:

fixing the first truss column and the second truss column through an external support member to ensure that an accurate dimensional position relation is established between the first truss column and the second truss column, and the distance between the first truss column and the second truss column is adjustable within an allowable tolerance range;

the step of completely curing the glue layer further comprises the following steps:

removing an external support for securing the first and second spar.

7. The method of assembling a truss structure for a remote sensing camera of claim 6, wherein,

the truss and the connector are pre-connected after a layer of thin glue is coated on the connecting surface of the truss connected with the connector, and the method further comprises the following steps:

try one by one and install the connector to one the truss to and try one by one the connector to first purlin post second purlin post, wherein, the connector with the fit dimension clearance of truss is 0.1mm-0.15mm, in order to ensure the truss is relative the connector all slides the setting in axis direction and circumferencial direction.

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